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Home › Chrysler › 2011 › 300 Base, Gas/Ethanol › Repair and Diagnosis › Engine Performance › Engine Control Systems › (Drivetrain Control Module (DTCM) - Electrical Diagnostics) › DTC Troubleshooting › U0121-Lost Communication With Abs › Diagnostic Test

Diagnostic Test

  1. VERIFY THE DTC IS ACTIVE 
    1. Ignition on, engine not running.
    2. With the scan tool, select view DTCs.

      Is the DTC Active at this time?

      Yes 

      • Refer to  DIAGNOSIS AND TESTING  and perform the U0121-Lost Communication with Anti-Lock Brake Module diagnostic procedure.

      No 

      • Refer to  Diagnosis and Testing  and perform the Stored Lost Communication DTCs diagnostic procedure.
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