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Home >> Fiat >> 2012 >> 500c Pop, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 ((Transmission Control Module (TCM) - Electrical Diagnostics) >> Diagnosis And Testing >> U0077-Control Module Communication Bus Off >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 Fiat 500c and 2013 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. VERIFY THE DTC IS ACTIVE 
    1. Ignition on, engine not running.
    2. With the scan tool, read the DTCs.

      Is the DTC Active at this time?

      Yes 

      No 

      • Refer to  DIAGNOSIS AND TESTING  and perform the Stored Lost Communication DTCs diagnostic procedure.