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Home >> Jeep >> 2013 >> Wrangler Rubicon, Automatic Trans >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> U0121-Lost Communication With Abs >> Diagnostic Test
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Diagnostic Test

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

      Is the DTC Active at this time?

      Yes 

      • Refer to DTC INDEX 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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