diff --git a/sections/cper-section-pci-bus.c b/sections/cper-section-pci-bus.c
new file mode 100644
index 0000000..a219674
--- /dev/null
+++ b/sections/cper-section-pci-bus.c
@@ -0,0 +1,49 @@
+/**
+ * Describes functions for converting PCI/PCI-X bus CPER sections from binary and JSON format
+ * into an intermediate format.
+ * 
+ * Author: Lawrence.Tang@arm.com
+ **/
+#include <stdio.h>
+#include "json.h"
+#include "../edk/Cper.h"
+#include "../cper-utils.h"
+#include "cper-section-pci-bus.h"
+
+//Converts a single PCI/PCI-X bus CPER section into JSON IR.
+json_object* cper_section_pci_bus_to_ir(void* section, EFI_ERROR_SECTION_DESCRIPTOR* descriptor)
+{
+    EFI_PCI_PCIX_BUS_ERROR_DATA* bus_error = (EFI_PCI_PCIX_BUS_ERROR_DATA*)section;
+    json_object* section_ir = json_object_new_object();
+
+    //Validation bits.
+    json_object* validation = bitfield_to_ir(bus_error->ValidFields, 9, PCI_BUS_ERROR_VALID_BITFIELD_NAMES);
+    json_object_object_add(section_ir, "validationBits", validation);
+
+    //Error status.
+    json_object* error_status = cper_generic_error_status_to_ir(&bus_error->ErrorStatus);
+    json_object_object_add(section_ir, "errorStatus", error_status);
+
+    //PCI bus error type.
+    json_object* error_type = integer_to_readable_pair(bus_error->Type, 8,
+        PCI_BUS_ERROR_TYPES_KEYS,
+        PCI_BUS_ERROR_TYPES_VALUES,
+        "Unknown (Reserved)");
+    json_object_object_add(section_ir, "errorType", error_type);
+
+    //Bus ID.
+    json_object* bus_id = json_object_new_object();
+    json_object_object_add(bus_id, "busNumber", json_object_new_int(bus_error->BusId & 0xFF));
+    json_object_object_add(bus_id, "segmentNumber", json_object_new_int(bus_error->BusId >> 8));
+    json_object_object_add(section_ir, "busID", bus_id);
+
+    //Miscellaneous numeric fields.
+    json_object_object_add(section_ir, "busAddress", json_object_new_uint64(bus_error->BusAddress));
+    json_object_object_add(section_ir, "busData", json_object_new_uint64(bus_error->BusData));
+    json_object_object_add(section_ir, "busCommandType", json_object_new_string(bus_error->BusCommand == 0 ? "PCI" : "PCI-X"));
+    json_object_object_add(section_ir, "busRequestorID", json_object_new_uint64(bus_error->RequestorId));
+    json_object_object_add(section_ir, "busCompleterID", json_object_new_uint64(bus_error->ResponderId));
+    json_object_object_add(section_ir, "targetID", json_object_new_uint64(bus_error->TargetId));
+
+    return section_ir;
+}
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