DTC codes / Volkswagen codes / P1653
P1653 on Volkswagen vehicles means the engine control module (ECM) has been commanded by the brake electronics control unit (ABS/ESP module) to store a fault memory entry, and the ECM is now telling you to check the brake ECU's own diagnostic trouble codes (DTCs). The engine computer did not detect a brake fault itself; it received a request over the controller area network (CAN) bus from the brake module to log this code and illuminate the warning light.
Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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