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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 Anti-Lock Brake System (ABS) and Stability Control article. 

On vehicles equipped with a 3.5L GTDI engine, the TCM is part of the PCM and uses separate HS-CAN circuits. With the ignition ON, the TCM 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 TCM, refer to the Network Message Chart in Description and Operation of the Anti-Lock Brake System (ABS) and Stability Control article. 

PPT AI ABS MODULE DTC FAULT TRIGGER CONDITIONS

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.
U0101:00 Lost Communication With TCM: No Sub Type Information This DTC when the ABS module does not receive the transmission gear data message 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 gear lever position or driven wheel torque 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.
U0402:00 Invalid Data Received from TCM: No Sub Type Information This DTC sets if the ABS module receives invalid data in the brake pedal position, gear lever position or transmission torque 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.
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