Diagnostic Test

VERIFY DTC IS ACTIVE
1. Ignition on, engine not running.
2. Using a scan tool, read ACC DTCs.
  Is the DTC active at this time?
  
  Yes
  - Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing and perform the U0101-Lost Communication with TCM diagnostic procedure.
  No
  - Refer to Non-DTC Diagnostics/Communication - Diagnosis and Testing and perform the Stored Lost Communication DTCs diagnostic procedure.