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Normal Operation And Fault Conditions

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

PPT CY ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Setting Conditions
U012A:00 Lost Communication with Chassis Control Module 'A': No Subtype Information This DTC sets if the ABS module does not receive any messages from the CCM.