diff --git a/phosphor-regulators/src/config_file_parser.cpp b/phosphor-regulators/src/config_file_parser.cpp
index 791f3f7..3959978 100644
--- a/phosphor-regulators/src/config_file_parser.cpp
+++ b/phosphor-regulators/src/config_file_parser.cpp
@@ -113,9 +113,8 @@
     }
     else if (element.contains("i2c_write_bytes"))
     {
-        // TODO: Not implemented yet
-        // action = parseI2CWriteBytes(element["i2c_write_bytes"]);
-        // ++propertyCount;
+        action = parseI2CWriteBytes(element["i2c_write_bytes"]);
+        ++propertyCount;
     }
     else if (element.contains("if"))
     {
@@ -193,6 +192,17 @@
     return chassis;
 }
 
+std::vector<uint8_t> parseHexByteArray(const json& element)
+{
+    verifyIsArray(element);
+    std::vector<uint8_t> values;
+    for (auto& valueElement : element)
+    {
+        values.emplace_back(parseHexByte(valueElement));
+    }
+    return values;
+}
+
 std::unique_ptr<I2CWriteBitAction> parseI2CWriteBit(const json& element)
 {
     verifyIsObject(element);
@@ -200,7 +210,7 @@
 
     // Required register property
     const json& regElement = getRequiredProperty(element, "register");
-    uint8_t reg = parseStringToUint8(regElement);
+    uint8_t reg = parseHexByte(regElement);
     ++propertyCount;
 
     // Required position property
@@ -226,12 +236,12 @@
 
     // Required register property
     const json& regElement = getRequiredProperty(element, "register");
-    uint8_t reg = parseStringToUint8(regElement);
+    uint8_t reg = parseHexByte(regElement);
     ++propertyCount;
 
     // Required value property
     const json& valueElement = getRequiredProperty(element, "value");
-    uint8_t value = parseStringToUint8(valueElement);
+    uint8_t value = parseHexByte(valueElement);
     ++propertyCount;
 
     // Optional mask property
@@ -239,7 +249,7 @@
     auto maskIt = element.find("mask");
     if (maskIt != element.end())
     {
-        mask = parseStringToUint8(*maskIt);
+        mask = parseHexByte(*maskIt);
         ++propertyCount;
     }
 
@@ -249,6 +259,46 @@
     return std::make_unique<I2CWriteByteAction>(reg, value, mask);
 }
 
+std::unique_ptr<I2CWriteBytesAction> parseI2CWriteBytes(const json& element)
+{
+    verifyIsObject(element);
+    unsigned int propertyCount{0};
+
+    // Required register property
+    const json& regElement = getRequiredProperty(element, "register");
+    uint8_t reg = parseHexByte(regElement);
+    ++propertyCount;
+
+    // Required values property
+    const json& valueElement = getRequiredProperty(element, "values");
+    std::vector<uint8_t> values = parseHexByteArray(valueElement);
+    ++propertyCount;
+
+    // Optional masks property
+    std::vector<uint8_t> masks{};
+    auto masksIt = element.find("masks");
+    if (masksIt != element.end())
+    {
+        masks = parseHexByteArray(*masksIt);
+        ++propertyCount;
+    }
+
+    // Verify masks array (if specified) was same size as values array
+    if ((!masks.empty()) && (masks.size() != values.size()))
+    {
+        throw std::invalid_argument{"Invalid number of elements in masks"};
+    }
+
+    // Verify no invalid properties exist
+    verifyPropertyCount(element, propertyCount);
+
+    if (masks.empty())
+    {
+        return std::make_unique<I2CWriteBytesAction>(reg, values);
+    }
+    return std::make_unique<I2CWriteBytesAction>(reg, values, masks);
+}
+
 std::unique_ptr<PMBusWriteVoutCommandAction>
     parsePMBusWriteVoutCommand(const json& element)
 {
diff --git a/phosphor-regulators/src/config_file_parser.hpp b/phosphor-regulators/src/config_file_parser.hpp
index abfa4f5..a8286f1 100644
--- a/phosphor-regulators/src/config_file_parser.hpp
+++ b/phosphor-regulators/src/config_file_parser.hpp
@@ -19,6 +19,7 @@
 #include "chassis.hpp"
 #include "i2c_write_bit_action.hpp"
 #include "i2c_write_byte_action.hpp"
+#include "i2c_write_bytes_action.hpp"
 #include "pmbus_write_vout_command_action.hpp"
 #include "rule.hpp"
 
@@ -203,6 +204,53 @@
 }
 
 /**
+ * Parses a JSON element containing a byte value expressed as a hexadecimal
+ * string.
+ *
+ * The JSON number data type does not support the hexadecimal format.  For this
+ * reason, hexadecimal byte values are stored as strings in the configuration
+ * file.
+ *
+ * Returns the corresponding C++ uint8_t value.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return uint8_t value
+ */
+inline uint8_t parseHexByte(const nlohmann::json& element)
+{
+    if (!element.is_string())
+    {
+        throw std::invalid_argument{"Element is not a string"};
+    }
+    std::string value = element;
+
+    bool isHex = (value.compare(0, 2, "0x") == 0) && (value.size() > 2) &&
+                 (value.size() < 5) &&
+                 (value.find_first_not_of("0123456789abcdefABCDEF", 2) ==
+                  std::string::npos);
+    if (!isHex)
+    {
+        throw std::invalid_argument{"Element is not hexadecimal string"};
+    }
+    return static_cast<uint8_t>(std::stoul(value, 0, 0));
+}
+
+/**
+ * Parses a JSON element containing an array of byte values expressed as a
+ * hexadecimal strings.
+ *
+ * Returns the corresponding C++ uint8_t values.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return vector of uint8_t
+ */
+std::vector<uint8_t> parseHexByteArray(const nlohmann::json& element);
+
+/**
  * Parses a JSON element containing an i2c_write_bit action.
  *
  * Returns the corresponding C++ I2CWriteBitAction object.
@@ -229,6 +277,19 @@
     parseI2CWriteByte(const nlohmann::json& element);
 
 /**
+ * Parses a JSON element containing an i2c_write_bytes action.
+ *
+ * Returns the corresponding C++ I2CWriteBytesAction object.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return I2CWriteBytesAction object
+ */
+std::unique_ptr<I2CWriteBytesAction>
+    parseI2CWriteBytes(const nlohmann::json& element);
+
+/**
  * Parses a JSON element containing an 8-bit signed integer.
  *
  * Returns the corresponding C++ int8_t value.
@@ -332,31 +393,6 @@
 }
 
 /**
- * Parses a JSON element containing a hexadecimal string.
- *
- * Returns the corresponding C++ uint8_t value.
- *
- * Throws an exception if parsing fails.
- *
- * @param element JSON element
- * @return uint8_t value
- */
-inline uint8_t parseStringToUint8(const nlohmann::json& element)
-{
-    std::string value = parseString(element);
-
-    bool isHex = (value.compare(0, 2, "0x") == 0) && (value.size() > 2) &&
-                 (value.size() < 5) &&
-                 (value.find_first_not_of("0123456789abcdefABCDEF", 2) ==
-                  std::string::npos);
-    if (!isHex)
-    {
-        throw std::invalid_argument{"Element is not hexadecimal string"};
-    }
-    return static_cast<uint8_t>(std::stoul(value, 0, 0));
-}
-
-/**
  * Parses a JSON element containing an 8-bit unsigned integer.
  *
  * Returns the corresponding C++ uint8_t value.
diff --git a/phosphor-regulators/test/config_file_parser_tests.cpp b/phosphor-regulators/test/config_file_parser_tests.cpp
index 7d36653..df2d87e 100644
--- a/phosphor-regulators/test/config_file_parser_tests.cpp
+++ b/phosphor-regulators/test/config_file_parser_tests.cpp
@@ -20,6 +20,7 @@
 #include "i2c_interface.hpp"
 #include "i2c_write_bit_action.hpp"
 #include "i2c_write_byte_action.hpp"
+#include "i2c_write_bytes_action.hpp"
 #include "pmbus_utils.hpp"
 #include "pmbus_write_vout_command_action.hpp"
 #include "rule.hpp"
@@ -278,7 +279,18 @@
     }
 
     // Test where works: i2c_write_bytes action type specified
-    // TODO: Not implemented yet
+    {
+        const json element = R"(
+            {
+              "i2c_write_bytes": {
+                "register": "0x0A",
+                "values": [ "0xCC", "0xFF" ]
+              }
+            }
+        )"_json;
+        std::unique_ptr<Action> action = parseAction(element);
+        EXPECT_NE(action.get(), nullptr);
+    }
 
     // Test where works: if action type specified
     // TODO: Not implemented yet
@@ -563,6 +575,137 @@
     }
 }
 
+TEST(ConfigFileParserTests, ParseHexByte)
+{
+    // Test where works: "0xFF"
+    {
+        const json element = R"( "0xFF" )"_json;
+        uint8_t value = parseHexByte(element);
+        EXPECT_EQ(value, 0xFF);
+    }
+
+    // Test where works: "0xff"
+    {
+        const json element = R"( "0xff" )"_json;
+        uint8_t value = parseHexByte(element);
+        EXPECT_EQ(value, 0xff);
+    }
+
+    // Test where works: "0xf"
+    {
+        const json element = R"( "0xf" )"_json;
+        uint8_t value = parseHexByte(element);
+        EXPECT_EQ(value, 0xf);
+    }
+
+    // Test where fails: "0xfff"
+    try
+    {
+        const json element = R"( "0xfff" )"_json;
+        parseHexByte(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
+    }
+
+    // Test where fails: "0xAG"
+    try
+    {
+        const json element = R"( "0xAG" )"_json;
+        parseHexByte(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
+    }
+
+    // Test where fails: "ff"
+    try
+    {
+        const json element = R"( "ff" )"_json;
+        parseHexByte(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
+    }
+
+    // Test where fails: ""
+    try
+    {
+        const json element = "";
+        parseHexByte(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
+    }
+
+    // Test where fails: "f"
+    try
+    {
+        const json element = R"( "f" )"_json;
+        parseHexByte(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
+    }
+
+    // Test where fails: "0x"
+    try
+    {
+        const json element = R"( "0x" )"_json;
+        parseHexByte(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
+    }
+
+    // Test where fails: "0Xff"
+    try
+    {
+        const json element = R"( "0XFF" )"_json;
+        parseHexByte(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
+    }
+}
+
+TEST(ConfigFileParserTests, ParseHexByteArray)
+{
+    // Test where works
+    {
+        const json element = R"( [ "0xCC", "0xFF" ] )"_json;
+        std::vector<uint8_t> hexBytes = parseHexByteArray(element);
+        std::vector<uint8_t> expected = {0xcc, 0xff};
+        EXPECT_EQ(hexBytes, expected);
+    }
+
+    // Test where fails: Element is not an array
+    try
+    {
+        const json element = 0;
+        parseHexByteArray(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not an array");
+    }
+}
+
 TEST(ConfigFileParserTests, ParseI2CWriteBit)
 {
     // Test where works
@@ -868,6 +1011,181 @@
     }
 }
 
+TEST(ConfigFileParserTests, ParseI2CWriteBytes)
+{
+    // Test where works: Only required properties specified
+    {
+        const json element = R"(
+            {
+              "register": "0x0A",
+              "values": [ "0xCC", "0xFF" ]
+            }
+        )"_json;
+        std::unique_ptr<I2CWriteBytesAction> action =
+            parseI2CWriteBytes(element);
+        EXPECT_EQ(action->getRegister(), 0x0A);
+        EXPECT_EQ(action->getValues().size(), 2);
+        EXPECT_EQ(action->getValues()[0], 0xCC);
+        EXPECT_EQ(action->getValues()[1], 0xFF);
+        EXPECT_EQ(action->getMasks().size(), 0);
+    }
+
+    // Test where works: All properties specified
+    {
+        const json element = R"(
+            {
+              "register": "0x0A",
+              "values": [ "0xCC", "0xFF" ],
+              "masks":  [ "0x7F", "0x77" ]
+            }
+        )"_json;
+        std::unique_ptr<I2CWriteBytesAction> action =
+            parseI2CWriteBytes(element);
+        EXPECT_EQ(action->getRegister(), 0x0A);
+        EXPECT_EQ(action->getValues().size(), 2);
+        EXPECT_EQ(action->getValues()[0], 0xCC);
+        EXPECT_EQ(action->getValues()[1], 0xFF);
+        EXPECT_EQ(action->getMasks().size(), 2);
+        EXPECT_EQ(action->getMasks()[0], 0x7F);
+        EXPECT_EQ(action->getMasks()[1], 0x77);
+    }
+
+    // Test where fails: Element is not an object
+    try
+    {
+        const json element = R"( [ "0xFF", "0x01" ] )"_json;
+        parseI2CWriteBytes(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not an object");
+    }
+
+    // Test where fails: Invalid property specified
+    try
+    {
+        const json element = R"(
+            {
+              "register": "0x0A",
+              "values": [ "0xCC", "0xFF" ],
+              "masks":  [ "0x7F", "0x7F" ],
+              "foo": 1
+            }
+        )"_json;
+        parseI2CWriteBytes(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element contains an invalid property");
+    }
+
+    // Test where fails: register value is invalid
+    try
+    {
+        const json element = R"(
+            {
+              "register": "0x0Z",
+              "values": [ "0xCC", "0xFF" ],
+              "masks":  [ "0x7F", "0x7F" ]
+            }
+        )"_json;
+        parseI2CWriteBytes(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
+    }
+
+    // Test where fails: values value is invalid
+    try
+    {
+        const json element = R"(
+            {
+              "register": "0x0A",
+              "values": [ "0xCCC", "0xFF" ],
+              "masks":  [ "0x7F", "0x7F" ]
+            }
+        )"_json;
+        parseI2CWriteBytes(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
+    }
+
+    // Test where fails: masks value is invalid
+    try
+    {
+        const json element = R"(
+            {
+              "register": "0x0A",
+              "values": [ "0xCC", "0xFF" ],
+              "masks":  [ "F", "0x7F" ]
+            }
+        )"_json;
+        parseI2CWriteBytes(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
+    }
+
+    // Test where fails: number of elements in masks is invalid
+    try
+    {
+        const json element = R"(
+            {
+              "register": "0x0A",
+              "values": [ "0xCC", "0xFF" ],
+              "masks":  [ "0x7F" ]
+            }
+        )"_json;
+        parseI2CWriteBytes(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Invalid number of elements in masks");
+    }
+
+    // Test where fails: Required register property not specified
+    try
+    {
+        const json element = R"(
+            {
+              "values": [ "0xCC", "0xFF" ]
+            }
+        )"_json;
+        parseI2CWriteBytes(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Required property missing: register");
+    }
+
+    // Test where fails: Required values property not specified
+    try
+    {
+        const json element = R"(
+            {
+              "register": "0x0A"
+            }
+        )"_json;
+        parseI2CWriteBytes(element);
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& e)
+    {
+        EXPECT_STREQ(e.what(), "Required property missing: values");
+    }
+}
+
 TEST(ConfigFileParserTests, ParseInt8)
 {
     // Test where works: INT8_MIN
@@ -1396,114 +1714,6 @@
     }
 }
 
-TEST(ConfigFileParserTests, ParseStringToUint8)
-{
-    // Test where works: "0xFF"
-    {
-        const json element = R"( "0xFF" )"_json;
-        uint8_t value = parseStringToUint8(element);
-        EXPECT_EQ(value, 0xFF);
-    }
-
-    // Test where works: "0xff"
-    {
-        const json element = R"( "0xff" )"_json;
-        uint8_t value = parseStringToUint8(element);
-        EXPECT_EQ(value, 0xff);
-    }
-
-    // Test where works: "0xf"
-    {
-        const json element = R"( "0xf" )"_json;
-        uint8_t value = parseStringToUint8(element);
-        EXPECT_EQ(value, 0xf);
-    }
-
-    // Test where fails: "0xfff"
-    try
-    {
-        const json element = R"( "0xfff" )"_json;
-        parseStringToUint8(element);
-        ADD_FAILURE() << "Should not have reached this line.";
-    }
-    catch (const std::invalid_argument& e)
-    {
-        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
-    }
-
-    // Test where fails: "0xAG"
-    try
-    {
-        const json element = R"( "0xAG" )"_json;
-        parseStringToUint8(element);
-        ADD_FAILURE() << "Should not have reached this line.";
-    }
-    catch (const std::invalid_argument& e)
-    {
-        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
-    }
-
-    // Test where fails: "ff"
-    try
-    {
-        const json element = R"( "ff" )"_json;
-        parseStringToUint8(element);
-        ADD_FAILURE() << "Should not have reached this line.";
-    }
-    catch (const std::invalid_argument& e)
-    {
-        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
-    }
-
-    // Test where fails: ""
-    try
-    {
-        const json element = "";
-        parseStringToUint8(element);
-        ADD_FAILURE() << "Should not have reached this line.";
-    }
-    catch (const std::invalid_argument& e)
-    {
-        EXPECT_STREQ(e.what(), "Element contains an empty string");
-    }
-
-    // Test where fails: "f"
-    try
-    {
-        const json element = R"( "f" )"_json;
-        parseStringToUint8(element);
-        ADD_FAILURE() << "Should not have reached this line.";
-    }
-    catch (const std::invalid_argument& e)
-    {
-        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
-    }
-
-    // Test where fails: "0x"
-    try
-    {
-        const json element = R"( "0x" )"_json;
-        parseStringToUint8(element);
-        ADD_FAILURE() << "Should not have reached this line.";
-    }
-    catch (const std::invalid_argument& e)
-    {
-        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
-    }
-
-    // Test where fails: "0Xff"
-    try
-    {
-        const json element = R"( "0XFF" )"_json;
-        parseStringToUint8(element);
-        ADD_FAILURE() << "Should not have reached this line.";
-    }
-    catch (const std::invalid_argument& e)
-    {
-        EXPECT_STREQ(e.what(), "Element is not hexadecimal string");
-    }
-}
-
 TEST(ConfigFileParserTests, ParseUint8)
 {
     // Test where works: 0
diff --git a/phosphor-regulators/test/meson.build b/phosphor-regulators/test/meson.build
index 5f68fba..d23bdf1 100644
--- a/phosphor-regulators/test/meson.build
+++ b/phosphor-regulators/test/meson.build
@@ -66,5 +66,5 @@
                     libi2c_dev_mock_inc
                 ]
      ),
-     timeout : 150
+     timeout : 180
 )