diff --git a/redfish-core/lib/cable.hpp b/redfish-core/lib/cable.hpp
index e724118..51eca27 100644
--- a/redfish-core/lib/cable.hpp
+++ b/redfish-core/lib/cable.hpp
@@ -7,6 +7,7 @@
 #include "utils/dbus_utils.hpp"
 #include "utils/json_utils.hpp"
 
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 #include <sdbusplus/unpack_properties.hpp>
 
@@ -120,9 +121,12 @@
             return;
         }
         BMCWEB_LOG_DEBUG << "Cable Id: " << cableId;
-        auto respHandler =
+        constexpr std::array<std::string_view, 1> interfaces = {
+            "xyz.openbmc_project.Inventory.Item.Cable"};
+        dbus::utility::getSubTree(
+            "/xyz/openbmc_project/inventory", 0, interfaces,
             [asyncResp,
-             cableId](const boost::system::error_code ec,
+             cableId](const boost::system::error_code& ec,
                       const dbus::utility::MapperGetSubTreeResponse& subtree) {
             if (ec.value() == EBADR)
             {
@@ -155,15 +159,7 @@
                 return;
             }
             messages::resourceNotFound(asyncResp->res, "Cable", cableId);
-        };
-
-        crow::connections::systemBus->async_method_call(
-            respHandler, "xyz.openbmc_project.ObjectMapper",
-            "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-            "/xyz/openbmc_project/inventory", 0,
-            std::array<const char*, 1>{
-                "xyz.openbmc_project.Inventory.Item.Cable"});
+            });
         });
 }
 
diff --git a/redfish-core/lib/chassis.hpp b/redfish-core/lib/chassis.hpp
index 81f8254..5489351 100644
--- a/redfish-core/lib/chassis.hpp
+++ b/redfish-core/lib/chassis.hpp
@@ -25,6 +25,7 @@
 #include "utils/dbus_utils.hpp"
 #include "utils/json_utils.hpp"
 
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 #include <sdbusplus/unpack_properties.hpp>
 
@@ -109,9 +110,12 @@
  */
 inline void getPhysicalSecurityData(std::shared_ptr<bmcweb::AsyncResp> aResp)
 {
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Chassis.Intrusion"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/Intrusion", 1, interfaces,
         [aResp{std::move(aResp)}](
-            const boost::system::error_code ec,
+            const boost::system::error_code& ec,
             const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -129,12 +133,7 @@
                 return;
             }
         }
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/Intrusion", 1,
-        std::array<const char*, 1>{"xyz.openbmc_project.Chassis.Intrusion"});
+        });
 }
 
 inline void handleChassisCollectionGet(
@@ -219,13 +218,14 @@
     {
         return;
     }
-    const std::array<const char*, 2> interfaces = {
+    constexpr std::array<std::string_view, 2> interfaces = {
         "xyz.openbmc_project.Inventory.Item.Board",
         "xyz.openbmc_project.Inventory.Item.Chassis"};
 
-    crow::connections::systemBus->async_method_call(
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, interfaces,
         [asyncResp, chassisId(std::string(chassisId))](
-            const boost::system::error_code ec,
+            const boost::system::error_code& ec,
             const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -454,11 +454,7 @@
 
         // Couldn't find an object with that name.  return an error
         messages::resourceNotFound(asyncResp->res, "Chassis", chassisId);
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", 0, interfaces);
+        });
 
     getPhysicalSecurityData(asyncResp);
 }
@@ -499,13 +495,14 @@
             "299 - \"IndicatorLED is deprecated. Use LocationIndicatorActive instead.\"");
     }
 
-    const std::array<const char*, 2> interfaces = {
+    constexpr std::array<std::string_view, 2> interfaces = {
         "xyz.openbmc_project.Inventory.Item.Board",
         "xyz.openbmc_project.Inventory.Item.Chassis"};
 
     const std::string& chassisId = param;
 
-    crow::connections::systemBus->async_method_call(
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, interfaces,
         [asyncResp, chassisId, locationIndicatorActive,
          indicatorLed](const boost::system::error_code ec,
                        const dbus::utility::MapperGetSubTreeResponse& subtree) {
@@ -581,11 +578,7 @@
         }
 
         messages::resourceNotFound(asyncResp->res, "Chassis", chassisId);
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", 0, interfaces);
+        });
 }
 
 /**
diff --git a/redfish-core/lib/managers.hpp b/redfish-core/lib/managers.hpp
index e8fa14b..376f70c 100644
--- a/redfish-core/lib/managers.hpp
+++ b/redfish-core/lib/managers.hpp
@@ -27,13 +27,16 @@
 #include "utils/systemd_utils.hpp"
 #include "utils/time_utils.hpp"
 
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 #include <sdbusplus/unpack_properties.hpp>
 
 #include <algorithm>
+#include <array>
 #include <cstdint>
 #include <memory>
 #include <sstream>
+#include <string_view>
 #include <variant>
 
 namespace redfish
@@ -1177,9 +1180,13 @@
         std::shared_ptr<GetPIDValues> self = shared_from_this();
 
         // get all configurations
-        crow::connections::systemBus->async_method_call(
+        constexpr std::array<std::string_view, 4> interfaces = {
+            pidConfigurationIface, pidZoneConfigurationIface,
+            objectManagerIface, stepwiseConfigurationIface};
+        dbus::utility::getSubTree(
+            "/", 0, interfaces,
             [self](
-                const boost::system::error_code ec,
+                const boost::system::error_code& ec,
                 const dbus::utility::MapperGetSubTreeResponse& subtreeLocal) {
             if (ec)
             {
@@ -1188,18 +1195,15 @@
                 return;
             }
             self->complete.subtree = subtreeLocal;
-            },
-            "xyz.openbmc_project.ObjectMapper",
-            "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.ObjectMapper", "GetSubTree", "/", 0,
-            std::array<const char*, 4>{
-                pidConfigurationIface, pidZoneConfigurationIface,
-                objectManagerIface, stepwiseConfigurationIface});
+            });
 
         // at the same time get the selected profile
-        crow::connections::systemBus->async_method_call(
+        constexpr std::array<std::string_view, 1> thermalModeIfaces = {
+            thermalModeIface};
+        dbus::utility::getSubTree(
+            "/", 0, thermalModeIfaces,
             [self](
-                const boost::system::error_code ec,
+                const boost::system::error_code& ec,
                 const dbus::utility::MapperGetSubTreeResponse& subtreeLocal) {
             if (ec || subtreeLocal.empty())
             {
@@ -1252,11 +1256,7 @@
                 self->complete.currentProfile = *current;
                 self->complete.supportedProfiles = *supported;
                 });
-            },
-            "xyz.openbmc_project.ObjectMapper",
-            "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.ObjectMapper", "GetSubTree", "/", 0,
-            std::array<const char*, 1>{thermalModeIface});
+            });
     }
 
     static void
@@ -1414,8 +1414,11 @@
             "GetManagedObjects");
 
         // at the same time get the profile information
-        crow::connections::systemBus->async_method_call(
-            [self](const boost::system::error_code ec,
+        constexpr std::array<std::string_view, 1> thermalModeIfaces = {
+            thermalModeIface};
+        dbus::utility::getSubTree(
+            "/", 0, thermalModeIfaces,
+            [self](const boost::system::error_code& ec,
                    const dbus::utility::MapperGetSubTreeResponse& subtree) {
             if (ec || subtree.empty())
             {
@@ -1467,11 +1470,7 @@
                 self->profileConnection = owner;
                 self->profilePath = path;
                 });
-            },
-            "xyz.openbmc_project.ObjectMapper",
-            "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.ObjectMapper", "GetSubTree", "/", 0,
-            std::array<const char*, 1>{thermalModeIface});
+            });
     }
     void pidSetDone()
     {
@@ -2076,9 +2075,12 @@
                 });
         }
 
-        crow::connections::systemBus->async_method_call(
+        constexpr std::array<std::string_view, 1> interfaces = {
+            "xyz.openbmc_project.Inventory.Item.Bmc"};
+        dbus::utility::getSubTree(
+            "/xyz/openbmc_project/inventory", 0, interfaces,
             [asyncResp](
-                const boost::system::error_code ec,
+                const boost::system::error_code& ec,
                 const dbus::utility::MapperGetSubTreeResponse& subtree) {
             if (ec)
             {
@@ -2181,13 +2183,7 @@
                     getLocation(asyncResp, connectionName, path);
                 }
             }
-            },
-            "xyz.openbmc_project.ObjectMapper",
-            "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-            "/xyz/openbmc_project/inventory", int32_t(0),
-            std::array<const char*, 1>{
-                "xyz.openbmc_project.Inventory.Item.Bmc"});
+            });
         });
 
     BMCWEB_ROUTE(app, "/redfish/v1/Managers/bmc/")
diff --git a/redfish-core/lib/memory.hpp b/redfish-core/lib/memory.hpp
index 3e3360b..e55eded 100644
--- a/redfish-core/lib/memory.hpp
+++ b/redfish-core/lib/memory.hpp
@@ -25,6 +25,7 @@
 #include "utils/hex_utils.hpp"
 #include "utils/json_utils.hpp"
 
+#include <boost/system/error_code.hpp>
 #include <nlohmann/json.hpp>
 #include <sdbusplus/asio/property.hpp>
 #include <sdbusplus/unpack_properties.hpp>
@@ -706,9 +707,13 @@
                         const std::string& dimmId)
 {
     BMCWEB_LOG_DEBUG << "Get available system dimm resources.";
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 2> dimmInterfaces = {
+        "xyz.openbmc_project.Inventory.Item.Dimm",
+        "xyz.openbmc_project.Inventory.Item.PersistentMemory.Partition"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, dimmInterfaces,
         [dimmId, aResp{std::move(aResp)}](
-            const boost::system::error_code ec,
+            const boost::system::error_code& ec,
             const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -758,14 +763,7 @@
         aResp->res.jsonValue["@odata.id"] =
             "/redfish/v1/Systems/system/Memory/" + dimmId;
         return;
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", 0,
-        std::array<const char*, 2>{
-            "xyz.openbmc_project.Inventory.Item.Dimm",
-            "xyz.openbmc_project.Inventory.Item.PersistentMemory.Partition"});
+        });
 }
 
 inline void requestRoutesMemoryCollection(App& app)
diff --git a/redfish-core/lib/network_protocol.hpp b/redfish-core/lib/network_protocol.hpp
index 00324d7..d3910b3 100644
--- a/redfish-core/lib/network_protocol.hpp
+++ b/redfish-core/lib/network_protocol.hpp
@@ -25,9 +25,12 @@
 #include "utils/json_utils.hpp"
 #include "utils/stl_utils.hpp"
 
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 
+#include <array>
 #include <optional>
+#include <string_view>
 #include <variant>
 
 namespace redfish
@@ -320,7 +323,10 @@
     // Any remaining array elements should be removed
     currentNtpServers.erase(currentNtpServer, currentNtpServers.end());
 
-    auto respHandler =
+    constexpr std::array<std::string_view, 1> ethInterfaces = {
+        "xyz.openbmc_project.Network.EthernetInterface"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project", 0, ethInterfaces,
         [asyncResp, currentNtpServers](
             const boost::system::error_code& ec,
             const dbus::utility::MapperGetSubTreeResponse& subtree) {
@@ -357,12 +363,7 @@
                 }
             }
         }
-    };
-
-    std::vector<std::string> interfaces = {
-        "xyz.openbmc_project.Network.EthernetInterface"};
-    dbus::utility::getSubTree("/xyz/openbmc_project", interfaces,
-                              std::move(respHandler));
+        });
 }
 
 inline void
@@ -370,7 +371,10 @@
                           const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
                           const std::string& netBasePath)
 {
-    auto respHandler =
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Control.Service.Attributes"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/control/service", 0, interfaces,
         [protocolEnabled, asyncResp,
          netBasePath](const boost::system::error_code& ec,
                       const dbus::utility::MapperGetSubTreeResponse& subtree) {
@@ -411,12 +415,7 @@
                     dbus::utility::DbusVariantType{protocolEnabled});
             }
         }
-    };
-
-    std::vector<std::string> interfaces = {
-        "xyz.openbmc_project.Control.Service.Attributes"};
-    dbus::utility::getSubTree("/xyz/openbmc_project/control/service",
-                              interfaces, std::move(respHandler));
+        });
 }
 
 inline std::string getHostName()
diff --git a/redfish-core/lib/pcie_slots.hpp b/redfish-core/lib/pcie_slots.hpp
index d25b66b..1c4b6e9 100644
--- a/redfish-core/lib/pcie_slots.hpp
+++ b/redfish-core/lib/pcie_slots.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "app.hpp"
+#include "dbus_utility.hpp"
 #include "error_messages.hpp"
 #include "generated/enums/pcie_slot.hpp"
 #include "pcie.hpp"
@@ -9,9 +10,13 @@
 #include "utils/dbus_utils.hpp"
 #include "utils/json_utils.hpp"
 
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 #include <sdbusplus/unpack_properties.hpp>
 
+#include <array>
+#include <string_view>
+
 namespace redfish
 {
 
@@ -259,18 +264,15 @@
         return;
     }
 
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Inventory.Item.PCIeSlot"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, interfaces,
         [asyncResp,
-         chassisID](const boost::system::error_code ec,
+         chassisID](const boost::system::error_code& ec,
                     const dbus::utility::MapperGetSubTreeResponse& subtree) {
         onMapperSubtreeDone(asyncResp, chassisID, ec, subtree);
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", int32_t(0),
-        std::array<const char*, 1>{
-            "xyz.openbmc_project.Inventory.Item.PCIeSlot"});
+        });
 }
 
 inline void requestRoutesPCIeSlots(App& app)
diff --git a/redfish-core/lib/processor.hpp b/redfish-core/lib/processor.hpp
index 879c04b..1ac29ff 100644
--- a/redfish-core/lib/processor.hpp
+++ b/redfish-core/lib/processor.hpp
@@ -27,6 +27,7 @@
 #include "utils/json_utils.hpp"
 
 #include <boost/container/flat_map.hpp>
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 #include <sdbusplus/message/native_types.hpp>
 #include <sdbusplus/unpack_properties.hpp>
@@ -681,10 +682,20 @@
     BMCWEB_LOG_DEBUG << "Get available system processor resources.";
 
     // GetSubTree on all interfaces which provide info about a Processor
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 8> interfaces = {
+        "xyz.openbmc_project.Common.UUID",
+        "xyz.openbmc_project.Inventory.Decorator.Asset",
+        "xyz.openbmc_project.Inventory.Decorator.Revision",
+        "xyz.openbmc_project.Inventory.Item.Cpu",
+        "xyz.openbmc_project.Inventory.Decorator.LocationCode",
+        "xyz.openbmc_project.Inventory.Item.Accelerator",
+        "xyz.openbmc_project.Control.Processor.CurrentOperatingConfig",
+        "xyz.openbmc_project.Inventory.Decorator.UniqueIdentifier"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, interfaces,
         [resp, processorId, handler = std::forward<Handler>(handler)](
-            boost::system::error_code ec,
-            const dbus::utility::MapperGetSubTreeResponse& subtree) mutable {
+            const boost::system::error_code& ec,
+            const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
             BMCWEB_LOG_DEBUG << "DBUS response error: " << ec;
@@ -729,20 +740,7 @@
             return;
         }
         messages::resourceNotFound(resp->res, "Processor", processorId);
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", 0,
-        std::array<const char*, 8>{
-            "xyz.openbmc_project.Common.UUID",
-            "xyz.openbmc_project.Inventory.Decorator.Asset",
-            "xyz.openbmc_project.Inventory.Decorator.Revision",
-            "xyz.openbmc_project.Inventory.Item.Cpu",
-            "xyz.openbmc_project.Inventory.Decorator.LocationCode",
-            "xyz.openbmc_project.Inventory.Item.Accelerator",
-            "xyz.openbmc_project.Control.Processor.CurrentOperatingConfig",
-            "xyz.openbmc_project.Inventory.Decorator.UniqueIdentifier"});
+        });
 }
 
 inline void getProcessorData(const std::shared_ptr<bmcweb::AsyncResp>& aResp,
@@ -1137,9 +1135,12 @@
         }
         // Ask for all objects implementing OperatingConfig so we can search
         // for one with a matching name
-        crow::connections::systemBus->async_method_call(
+        constexpr std::array<std::string_view, 1> interfaces = {
+            "xyz.openbmc_project.Inventory.Item.Cpu.OperatingConfig"};
+        dbus::utility::getSubTree(
+            "/xyz/openbmc_project/inventory", 0, interfaces,
             [asyncResp, cpuName, configName, reqUrl{req.url}](
-                boost::system::error_code ec,
+                const boost::system::error_code& ec,
                 const dbus::utility::MapperGetSubTreeResponse& subtree) {
             if (ec)
             {
@@ -1172,13 +1173,7 @@
             }
             messages::resourceNotFound(asyncResp->res, "OperatingConfig",
                                        configName);
-            },
-            "xyz.openbmc_project.ObjectMapper",
-            "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-            "/xyz/openbmc_project/inventory", 0,
-            std::array<const char*, 1>{
-                "xyz.openbmc_project.Inventory.Item.Cpu.OperatingConfig"});
+            });
         });
 }
 
diff --git a/redfish-core/lib/redfish_util.hpp b/redfish-core/lib/redfish_util.hpp
index 2bf66ba..d7a7f8c 100644
--- a/redfish-core/lib/redfish_util.hpp
+++ b/redfish-core/lib/redfish_util.hpp
@@ -20,9 +20,12 @@
 #include "dbus_utility.hpp"
 #include "error_messages.hpp"
 
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 
+#include <array>
 #include <charconv>
+#include <string_view>
 
 namespace redfish
 {
@@ -60,9 +63,13 @@
                       CallbackFunc&& callback)
 {
     // Find managed chassis
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 2> interfaces = {
+        "xyz.openbmc_project.Inventory.Item.Board",
+        "xyz.openbmc_project.Inventory.Item.Chassis"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, interfaces,
         [callback,
-         asyncResp](const boost::system::error_code ec,
+         asyncResp](const boost::system::error_code& ec,
                     const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -86,14 +93,7 @@
         std::string chassisId = subtree[0].first.substr(idPos + 1);
         BMCWEB_LOG_DEBUG << "chassisId = " << chassisId;
         callback(chassisId, asyncResp);
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", 0,
-        std::array<const char*, 2>{
-            "xyz.openbmc_project.Inventory.Item.Board",
-            "xyz.openbmc_project.Inventory.Item.Chassis"});
+        });
 }
 
 template <typename CallbackFunc>
diff --git a/redfish-core/lib/sensors.hpp b/redfish-core/lib/sensors.hpp
index 315398e..6be9e86 100644
--- a/redfish-core/lib/sensors.hpp
+++ b/redfish-core/lib/sensors.hpp
@@ -31,6 +31,7 @@
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/algorithm/string/split.hpp>
 #include <boost/range/algorithm/replace_copy_if.hpp>
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 #include <sdbusplus/unpack_properties.hpp>
 
@@ -354,14 +355,16 @@
 {
     BMCWEB_LOG_DEBUG << "getObjectsWithConnection enter";
     const std::string path = "/xyz/openbmc_project/sensors";
-    const std::array<std::string, 1> interfaces = {
+    constexpr std::array<std::string_view, 1> interfaces = {
         "xyz.openbmc_project.Sensor.Value"};
 
-    // Response handler for parsing objects subtree
-    auto respHandler =
+    // Make call to ObjectMapper to find all sensors objects
+    dbus::utility::getSubTree(
+        path, 2, interfaces,
         [callback{std::forward<Callback>(callback)}, sensorsAsyncResp,
-         sensorNames](const boost::system::error_code ec,
+         sensorNames](const boost::system::error_code& ec,
                       const dbus::utility::MapperGetSubTreeResponse& subtree) {
+        // Response handler for parsing objects subtree
         BMCWEB_LOG_DEBUG << "getObjectsWithConnection resp_handler enter";
         if (ec)
         {
@@ -404,12 +407,7 @@
         BMCWEB_LOG_DEBUG << "Found " << connections.size() << " connections";
         callback(std::move(connections), std::move(objectsWithConnection));
         BMCWEB_LOG_DEBUG << "getObjectsWithConnection resp_handler exit";
-    };
-    // Make call to ObjectMapper to find all sensors objects
-    crow::connections::systemBus->async_method_call(
-        std::move(respHandler), "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree", path, 2, interfaces);
+        });
     BMCWEB_LOG_DEBUG << "getObjectsWithConnection exit";
 }
 
@@ -975,9 +973,12 @@
 inline void populateFanRedundancy(
     const std::shared_ptr<SensorsAsyncResp>& sensorsAsyncResp)
 {
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Control.FanRedundancy"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/control", 2, interfaces,
         [sensorsAsyncResp](
-            const boost::system::error_code ec,
+            const boost::system::error_code& ec,
             const dbus::utility::MapperGetSubTreeResponse& resp) {
         if (ec)
         {
@@ -1144,13 +1145,7 @@
                     });
                 });
         }
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/control", 2,
-        std::array<const char*, 1>{
-            "xyz.openbmc_project.Control.FanRedundancy"});
+        });
 }
 
 inline void
@@ -1520,18 +1515,20 @@
     BMCWEB_LOG_DEBUG << "getInventoryItemsConnections enter";
 
     const std::string path = "/xyz/openbmc_project/inventory";
-    const std::array<std::string, 4> interfaces = {
+    constexpr std::array<std::string_view, 4> interfaces = {
         "xyz.openbmc_project.Inventory.Item",
         "xyz.openbmc_project.Inventory.Item.PowerSupply",
         "xyz.openbmc_project.Inventory.Decorator.Asset",
         "xyz.openbmc_project.State.Decorator.OperationalStatus"};
 
-    // Response handler for parsing output from GetSubTree
-    auto respHandler =
+    // Make call to ObjectMapper to find all inventory items
+    dbus::utility::getSubTree(
+        path, 0, interfaces,
         [callback{std::forward<Callback>(callback)}, sensorsAsyncResp,
          inventoryItems](
-            const boost::system::error_code ec,
+            const boost::system::error_code& ec,
             const dbus::utility::MapperGetSubTreeResponse& subtree) {
+        // Response handler for parsing output from GetSubTree
         BMCWEB_LOG_DEBUG << "getInventoryItemsConnections respHandler enter";
         if (ec)
         {
@@ -1567,13 +1564,7 @@
 
         callback(invConnections);
         BMCWEB_LOG_DEBUG << "getInventoryItemsConnections respHandler exit";
-    };
-
-    // Make call to ObjectMapper to find all inventory items
-    crow::connections::systemBus->async_method_call(
-        std::move(respHandler), "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree", path, 0, interfaces);
+        });
     BMCWEB_LOG_DEBUG << "getInventoryItemsConnections exit";
 }
 
@@ -1866,15 +1857,17 @@
     BMCWEB_LOG_DEBUG << "getInventoryLeds enter";
 
     const std::string path = "/xyz/openbmc_project";
-    const std::array<std::string, 1> interfaces = {
+    constexpr std::array<std::string_view, 1> interfaces = {
         "xyz.openbmc_project.Led.Physical"};
 
-    // Response handler for parsing output from GetSubTree
-    auto respHandler =
+    // Make call to ObjectMapper to find all inventory items
+    dbus::utility::getSubTree(
+        path, 0, interfaces,
         [callback{std::forward<Callback>(callback)}, sensorsAsyncResp,
          inventoryItems](
-            const boost::system::error_code ec,
+            const boost::system::error_code& ec,
             const dbus::utility::MapperGetSubTreeResponse& subtree) {
+        // Response handler for parsing output from GetSubTree
         BMCWEB_LOG_DEBUG << "getInventoryLeds respHandler enter";
         if (ec)
         {
@@ -1910,12 +1903,7 @@
         getInventoryLedData(sensorsAsyncResp, inventoryItems, ledConnections,
                             std::move(callback));
         BMCWEB_LOG_DEBUG << "getInventoryLeds respHandler exit";
-    };
-    // Make call to ObjectMapper to find all inventory items
-    crow::connections::systemBus->async_method_call(
-        std::move(respHandler), "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree", path, 0, interfaces);
+        });
     BMCWEB_LOG_DEBUG << "getInventoryLeds exit";
 }
 
@@ -2043,15 +2031,17 @@
         return;
     }
 
-    const std::array<std::string, 1> interfaces = {
+    constexpr std::array<std::string_view, 1> interfaces = {
         "xyz.openbmc_project.Control.PowerSupplyAttributes"};
 
-    // Response handler for parsing output from GetSubTree
-    auto respHandler =
+    // Make call to ObjectMapper to find the PowerSupplyAttributes service
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project", 0, interfaces,
         [callback{std::forward<Callback>(callback)}, sensorsAsyncResp,
          inventoryItems](
-            const boost::system::error_code ec,
+            const boost::system::error_code& ec,
             const dbus::utility::MapperGetSubTreeResponse& subtree) {
+        // Response handler for parsing output from GetSubTree
         BMCWEB_LOG_DEBUG << "getPowerSupplyAttributes respHandler enter";
         if (ec)
         {
@@ -2097,13 +2087,7 @@
                                      psAttributesConnections,
                                      std::move(callback));
         BMCWEB_LOG_DEBUG << "getPowerSupplyAttributes respHandler exit";
-    };
-    // Make call to ObjectMapper to find the PowerSupplyAttributes service
-    crow::connections::systemBus->async_method_call(
-        std::move(respHandler), "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project", 0, interfaces);
+        });
     BMCWEB_LOG_DEBUG << "getPowerSupplyAttributes exit";
 }
 
diff --git a/redfish-core/lib/storage.hpp b/redfish-core/lib/storage.hpp
index 1b297f3..aaed634 100644
--- a/redfish-core/lib/storage.hpp
+++ b/redfish-core/lib/storage.hpp
@@ -23,6 +23,7 @@
 #include "registries/privilege_registry.hpp"
 #include "utils/dbus_utils.hpp"
 
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 #include <sdbusplus/unpack_properties.hpp>
 
@@ -113,9 +114,12 @@
     getStorageControllers(const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
                           const std::shared_ptr<HealthPopulate>& health)
 {
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Inventory.Item.StorageController"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, interfaces,
         [asyncResp,
-         health](const boost::system::error_code ec,
+         health](const boost::system::error_code& ec,
                  const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec || subtree.empty())
         {
@@ -247,13 +251,7 @@
             health->children.emplace_back(subHealth);
             count++;
         }
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", int32_t(0),
-        std::array<const char*, 1>{
-            "xyz.openbmc_project.Inventory.Item.StorageController"});
+        });
 }
 
 inline void requestRoutesStorage(App& app)
@@ -572,9 +570,12 @@
             return;
         }
 
-        crow::connections::systemBus->async_method_call(
+        constexpr std::array<std::string_view, 1> interfaces = {
+            "xyz.openbmc_project.Inventory.Item.Drive"};
+        dbus::utility::getSubTree(
+            "/xyz/openbmc_project/inventory", 0, interfaces,
             [asyncResp,
-             driveId](const boost::system::error_code ec,
+             driveId](const boost::system::error_code& ec,
                       const dbus::utility::MapperGetSubTreeResponse& subtree) {
             if (ec)
             {
@@ -632,13 +633,7 @@
 
             addAllDriveInfo(asyncResp, connectionNames[0].first, path,
                             connectionNames[0].second);
-            },
-            "xyz.openbmc_project.ObjectMapper",
-            "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-            "/xyz/openbmc_project/inventory", int32_t(0),
-            std::array<const char*, 1>{
-                "xyz.openbmc_project.Inventory.Item.Drive"});
+            });
         });
 }
 
@@ -657,9 +652,13 @@
     }
 
     // mapper call lambda
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 2> interfaces = {
+        "xyz.openbmc_project.Inventory.Item.Board",
+        "xyz.openbmc_project.Inventory.Item.Chassis"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, interfaces,
         [asyncResp,
-         chassisId](const boost::system::error_code ec,
+         chassisId](const boost::system::error_code& ec,
                     const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -733,14 +732,7 @@
                 }); // end association lambda
 
         } // end Iterate over all retrieved ObjectPaths
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", 0,
-        std::array<const char*, 2>{
-            "xyz.openbmc_project.Inventory.Item.Board",
-            "xyz.openbmc_project.Inventory.Item.Chassis"});
+        });
 }
 
 inline void requestRoutesChassisDrive(App& app)
@@ -815,19 +807,15 @@
             continue;
         }
         //  mapper call drive
-        const std::array<const char*, 1> driveInterface = {
+        constexpr std::array<std::string_view, 1> driveInterface = {
             "xyz.openbmc_project.Inventory.Item.Drive"};
-
-        crow::connections::systemBus->async_method_call(
+        dbus::utility::getSubTree(
+            "/xyz/openbmc_project/inventory", 0, driveInterface,
             [asyncResp, chassisId, driveName](
-                const boost::system::error_code ec,
+                const boost::system::error_code& ec,
                 const dbus::utility::MapperGetSubTreeResponse& subtree) {
             buildDrive(asyncResp, chassisId, driveName, ec, subtree);
-            },
-            "xyz.openbmc_project.ObjectMapper",
-            "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-            "/xyz/openbmc_project/inventory", 0, driveInterface);
+            });
     }
 }
 
@@ -841,14 +829,15 @@
     {
         return;
     }
-    const std::array<const char*, 2> interfaces = {
+    constexpr std::array<std::string_view, 2> interfaces = {
         "xyz.openbmc_project.Inventory.Item.Board",
         "xyz.openbmc_project.Inventory.Item.Chassis"};
 
     // mapper call chassis
-    crow::connections::systemBus->async_method_call(
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, interfaces,
         [asyncResp, chassisId,
-         driveName](const boost::system::error_code ec,
+         driveName](const boost::system::error_code& ec,
                     const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -886,11 +875,7 @@
                 });
             break;
         }
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", 0, interfaces);
+        });
 }
 
 /**
diff --git a/redfish-core/lib/systems.hpp b/redfish-core/lib/systems.hpp
index ab5a80e..864a8d9 100644
--- a/redfish-core/lib/systems.hpp
+++ b/redfish-core/lib/systems.hpp
@@ -30,6 +30,7 @@
 #include "utils/time_utils.hpp"
 
 #include <boost/container/flat_map.hpp>
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 #include <sdbusplus/unpack_properties.hpp>
 
@@ -241,10 +242,17 @@
                       const std::shared_ptr<HealthPopulate>& systemHealth)
 {
     BMCWEB_LOG_DEBUG << "Get available system components.";
-
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 5> interfaces = {
+        "xyz.openbmc_project.Inventory.Decorator.Asset",
+        "xyz.openbmc_project.Inventory.Item.Cpu",
+        "xyz.openbmc_project.Inventory.Item.Dimm",
+        "xyz.openbmc_project.Inventory.Item.System",
+        "xyz.openbmc_project.Common.UUID",
+    };
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, interfaces,
         [aResp,
-         systemHealth](const boost::system::error_code ec,
+         systemHealth](const boost::system::error_code& ec,
                        const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -524,17 +532,6 @@
                 break;
             }
         }
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", int32_t(0),
-        std::array<const char*, 5>{
-            "xyz.openbmc_project.Inventory.Decorator.Asset",
-            "xyz.openbmc_project.Inventory.Item.Cpu",
-            "xyz.openbmc_project.Inventory.Item.Dimm",
-            "xyz.openbmc_project.Inventory.Item.System",
-            "xyz.openbmc_project.Common.UUID",
         });
 }
 
@@ -1271,9 +1268,11 @@
     const std::shared_ptr<bmcweb::AsyncResp>& aResp)
 {
     BMCWEB_LOG_DEBUG << "Get TPM required to boot.";
-
-    crow::connections::systemBus->async_method_call(
-        [aResp](const boost::system::error_code ec,
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Control.TPM.Policy"};
+    dbus::utility::getSubTree(
+        "/", 0, interfaces,
+        [aResp](const boost::system::error_code& ec,
                 const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -1337,11 +1336,7 @@
                     "Disabled";
             }
             });
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree", "/", int32_t(0),
-        std::array<const char*, 1>{"xyz.openbmc_project.Control.TPM.Policy"});
+        });
 }
 
 /**
@@ -1357,10 +1352,13 @@
     const std::shared_ptr<bmcweb::AsyncResp>& aResp, const bool tpmRequired)
 {
     BMCWEB_LOG_DEBUG << "Set TrustedModuleRequiredToBoot.";
-
-    crow::connections::systemBus->async_method_call(
-        [aResp, tpmRequired](const boost::system::error_code ec,
-                             dbus::utility::MapperGetSubTreeResponse& subtree) {
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Control.TPM.Policy"};
+    dbus::utility::getSubTree(
+        "/", 0, interfaces,
+        [aResp,
+         tpmRequired](const boost::system::error_code& ec,
+                      const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
             BMCWEB_LOG_DEBUG << "DBUS response error on TPM.Policy GetSubTree"
@@ -1421,11 +1419,7 @@
             serv, path, "org.freedesktop.DBus.Properties", "Set",
             "xyz.openbmc_project.Control.TPM.Policy", "TPMEnable",
             dbus::utility::DbusVariantType(tpmRequired));
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree", "/", int32_t(0),
-        std::array<const char*, 1>{"xyz.openbmc_project.Control.TPM.Policy"});
+        });
 }
 
 /**
@@ -1685,9 +1679,12 @@
 inline void setAssetTag(const std::shared_ptr<bmcweb::AsyncResp>& aResp,
                         const std::string& assetTag)
 {
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Inventory.Item.System"};
+    dbus::utility::getSubTree(
+        "/xyz/openbmc_project/inventory", 0, interfaces,
         [aResp,
-         assetTag](const boost::system::error_code ec,
+         assetTag](const boost::system::error_code& ec,
                    const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -1739,13 +1736,7 @@
             service, path, "org.freedesktop.DBus.Properties", "Set",
             "xyz.openbmc_project.Inventory.Decorator.AssetTag", "AssetTag",
             dbus::utility::DbusVariantType(assetTag));
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", int32_t(0),
-        std::array<const char*, 1>{
-            "xyz.openbmc_project.Inventory.Item.System"});
+        });
 }
 
 /**
@@ -1965,8 +1956,11 @@
     BMCWEB_LOG_DEBUG << "Get power mode.";
 
     // Get Power Mode object path:
-    crow::connections::systemBus->async_method_call(
-        [aResp](const boost::system::error_code ec,
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Control.Power.Mode"};
+    dbus::utility::getSubTree(
+        "/", 0, interfaces,
+        [aResp](const boost::system::error_code& ec,
                 const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -2026,11 +2020,7 @@
             BMCWEB_LOG_DEBUG << "Current power mode: " << pmode;
             translatePowerMode(aResp, pmode);
             });
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree", "/", int32_t(0),
-        std::array<const char*, 1>{"xyz.openbmc_project.Control.Power.Mode"});
+        });
 }
 
 /**
@@ -2088,9 +2078,12 @@
     }
 
     // Get Power Mode object path:
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Control.Power.Mode"};
+    dbus::utility::getSubTree(
+        "/", 0, interfaces,
         [aResp,
-         powerMode](const boost::system::error_code ec,
+         powerMode](const boost::system::error_code& ec,
                     const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -2147,11 +2140,7 @@
             service, path, "org.freedesktop.DBus.Properties", "Set",
             "xyz.openbmc_project.Control.Power.Mode", "PowerMode",
             dbus::utility::DbusVariantType(powerMode));
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree", "/", int32_t(0),
-        std::array<const char*, 1>{"xyz.openbmc_project.Control.Power.Mode"});
+        });
 }
 
 /**
@@ -2419,8 +2408,11 @@
     BMCWEB_LOG_DEBUG << "Get idle power saver parameters";
 
     // Get IdlePowerSaver object path:
-    crow::connections::systemBus->async_method_call(
-        [aResp](const boost::system::error_code ec,
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Control.Power.IdlePowerSaver"};
+    dbus::utility::getSubTree(
+        "/", 0, interfaces,
+        [aResp](const boost::system::error_code& ec,
                 const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -2482,12 +2474,7 @@
                 return;
             }
             });
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree", "/", int32_t(0),
-        std::array<const char*, 1>{
-            "xyz.openbmc_project.Control.Power.IdlePowerSaver"});
+        });
 
     BMCWEB_LOG_DEBUG << "EXIT: Get idle power saver parameters";
 }
@@ -2517,9 +2504,12 @@
     BMCWEB_LOG_DEBUG << "Set idle power saver properties";
 
     // Get IdlePowerSaver object path:
-    crow::connections::systemBus->async_method_call(
+    constexpr std::array<std::string_view, 1> interfaces = {
+        "xyz.openbmc_project.Control.Power.IdlePowerSaver"};
+    dbus::utility::getSubTree(
+        "/", 0, interfaces,
         [aResp, ipsEnable, ipsEnterUtil, ipsEnterTime, ipsExitUtil,
-         ipsExitTime](const boost::system::error_code ec,
+         ipsExitTime](const boost::system::error_code& ec,
                       const dbus::utility::MapperGetSubTreeResponse& subtree) {
         if (ec)
         {
@@ -2647,12 +2637,7 @@
                 "ExitDwellTime",
                 dbus::utility::DbusVariantType(timeMilliseconds));
         }
-        },
-        "xyz.openbmc_project.ObjectMapper",
-        "/xyz/openbmc_project/object_mapper",
-        "xyz.openbmc_project.ObjectMapper", "GetSubTree", "/", int32_t(0),
-        std::array<const char*, 1>{
-            "xyz.openbmc_project.Control.Power.IdlePowerSaver"});
+        });
 
     BMCWEB_LOG_DEBUG << "EXIT: Set idle power saver parameters";
 }
diff --git a/redfish-core/lib/update_service.hpp b/redfish-core/lib/update_service.hpp
index a8f0a6c..3d29f28 100644
--- a/redfish-core/lib/update_service.hpp
+++ b/redfish-core/lib/update_service.hpp
@@ -24,6 +24,7 @@
 #include "utils/dbus_utils.hpp"
 #include "utils/sw_utils.hpp"
 
+#include <boost/system/error_code.hpp>
 #include <sdbusplus/asio/property.hpp>
 #include <sdbusplus/bus/match.hpp>
 #include <sdbusplus/unpack_properties.hpp>
@@ -750,9 +751,17 @@
             "/redfish/v1/UpdateService/FirmwareInventory";
         asyncResp->res.jsonValue["Name"] = "Software Inventory Collection";
 
-        crow::connections::systemBus->async_method_call(
+        // Note that only firmware levels associated with a device
+        // are stored under /xyz/openbmc_project/software therefore
+        // to ensure only real FirmwareInventory items are returned,
+        // this full object path must be used here as input to
+        // mapper
+        constexpr std::array<std::string_view, 1> interfaces = {
+            "xyz.openbmc_project.Software.Version"};
+        dbus::utility::getSubTree(
+            "/xyz/openbmc_project/software", 0, interfaces,
             [asyncResp](
-                const boost::system::error_code ec,
+                const boost::system::error_code& ec,
                 const dbus::utility::MapperGetSubTreeResponse& subtree) {
             if (ec)
             {
@@ -781,17 +790,7 @@
                 asyncResp->res.jsonValue["Members@odata.count"] =
                     members.size();
             }
-            },
-            // Note that only firmware levels associated with a device
-            // are stored under /xyz/openbmc_project/software therefore
-            // to ensure only real FirmwareInventory items are returned,
-            // this full object path must be used here as input to
-            // mapper
-            "xyz.openbmc_project.ObjectMapper",
-            "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-            "/xyz/openbmc_project/software", static_cast<int32_t>(0),
-            std::array<const char*, 1>{"xyz.openbmc_project.Software.Version"});
+            });
         });
 }
 /* Fill related item links (i.e. bmc, bios) in for inventory */
@@ -911,9 +910,12 @@
         asyncResp->res.jsonValue["@odata.id"] =
             "/redfish/v1/UpdateService/FirmwareInventory/" + *swId;
 
-        crow::connections::systemBus->async_method_call(
+        constexpr std::array<std::string_view, 1> interfaces = {
+            "xyz.openbmc_project.Software.Version"};
+        dbus::utility::getSubTree(
+            "/", 0, interfaces,
             [asyncResp,
-             swId](const boost::system::error_code ec,
+             swId](const boost::system::error_code& ec,
                    const dbus::utility::MapperGetSubTreeResponse& subtree) {
             BMCWEB_LOG_DEBUG << "doGet callback...";
             if (ec)
@@ -960,12 +962,7 @@
 
             asyncResp->res.jsonValue["Updateable"] = false;
             sw_util::getSwUpdatableStatus(asyncResp, swId);
-            },
-            "xyz.openbmc_project.ObjectMapper",
-            "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.ObjectMapper", "GetSubTree", "/",
-            static_cast<int32_t>(0),
-            std::array<const char*, 1>{"xyz.openbmc_project.Software.Version"});
+            });
         });
 }