U0121 MERCURY - Lost Communication With The Anti-lock Brake System Control Module
- Damaged CAN communication bus circuit
- Faulty Anti-lock Brake System (ABS)
- Anti-lock Brake System (ABS) harness is open or shorted
- Anti-lock Brake System (ABS) circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
U0121 Mercury DescriptionThe Powertrain Control Module (PCM) continuously monitors the Controller Area Network (CAN) for messages from the ABS. The U0121 code sets when the PCM fails to receive the Anti-lock Brake System (ABS) message within the defined amount of time.
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