diff --git a/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp b/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp
index ec0d310508..0a1f90414e 100644
--- a/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp
+++ b/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp
@@ -113,6 +113,7 @@ const std::unordered_map<std::string, int> CONSTANTS_BY_NAME = {
         {"WHEEL_FRONT_LEFT", WHEEL_FRONT_LEFT},
         {"CHARGE_PORT_FRONT_LEFT", CHARGE_PORT_FRONT_LEFT},
         {"CHARGE_PORT_REAR_LEFT", CHARGE_PORT_REAR_LEFT},
+        {"FAN_DIRECTION_UNKNOWN", toInt(VehicleHvacFanDirection::UNKNOWN)},
         {"FAN_DIRECTION_FLOOR", FAN_DIRECTION_FLOOR},
         {"FAN_DIRECTION_FACE", FAN_DIRECTION_FACE},
         {"FAN_DIRECTION_DEFROST", FAN_DIRECTION_DEFROST},
diff --git a/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json b/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json
index 84edeeda7c..5503de22ec 100644
--- a/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json
+++ b/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json
@@ -2164,6 +2164,7 @@
             "property": "VehicleProperty::HVAC_FAN_DIRECTION_AVAILABLE",
             "defaultValue": {
                 "int32Values": [
+                    "Constants::FAN_DIRECTION_UNKNOWN",
                     "Constants::FAN_DIRECTION_FACE",
                     "Constants::FAN_DIRECTION_FLOOR",
                     "Constants::FAN_DIRECTION_FACE_FLOOR",