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Normal Operation and Fault Conditions

With the ignition ON, the GWM sends messages to the ABS module over the HS-CAN 2. 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 GWM, refer to the Network Message Chart in Description and Operation of Anti-Lock Brake System (ABS) and Stability Control article. 

PPT BP ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Conditions
U0146:87 Lost Communication With Gateway 'A': Missing Message Sets when the ABS module does not receive any messages from the GWM within the alloted time frame.