Normal Operation and Fault Conditions
With the ignition ON, the PCM sends messages to the ABS module through the GWM over the HS-CAN. If the ABS module does not receive these messages within a certain time frame (usually less than 1 second), the ABS module sets DTCs. For information on the messages sent to the ABS module by the PCM, refer to the Network Message Chart in Description and Operation of the appropriate Anti-Lock Brake System (ABS) and Stability Control article.
DTC DESCRIPTION
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0100:00 | Lost Communication With ECM/PCM "A": No Sub Type Information | This DTC when the ABS module does not receive any messages from the PCM. This can be due to a PCM failure, a circuit failure on the HS-CAN or an excessive load on the network. |
| U0401:00 | Invalid Data Received from ECM/PCM "A": No Sub Type Information | This DTC sets if the ABS module receives invalid data in the brake pedal position; gear lever position or driven wheel torque messages. This can be due to a PCM failure, a circuit failure on the HS-CAN or an excessive load on the network. |
| U0401:86 | Invalid Data Received from ECM/PCM "A": Signal Invalid | This DTC sets if the GSM requests a parking brake application and the vehicle is not stopped, or the ABS module received an invalid neutral tow command message. This can be due to a PCM failure, a circuit failure on the HS-CAN or an excessive load on the network. |