DTC U0447: Invalid Data Received From The Serial Data Gateway "A": Description

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The serial data gateway module is also known as the GWM.

The PSCM monitors the HS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 9 volts and there are no DTCs present inhibiting PSCM operation.

The GWM uses input from several sensors and components to gather vehicle data, then sends this data to the PSCM. If the data is corrupted or invalid, the GWM sends out "invalid", "fault" or "unknown" instead of the actual sensor data. For a list of the messages sent to the PSCM from the GWM, refer to the Network Message List in Description and Operation in the Power Steering article.

DTC U0447:00 (Invalid Data Received from Serial Data Gateway "A": No Sub Type Information) - This DTC sets if the PSCM receives an invalid or unknown message from the GWM.