C1277

C1277-00-ACC DISABLE DUE TO TCM

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuously monitored with the engine running and the Adaptive Cruise Control (ACC) Module in normal mode.

- Set Condition:
Normally when an active Diagnostic Trouble Code (DTC) is set against the Transmission Control Module (TCM) or the TCM is in LIMP IN mode. The ACC module will disable the ACC system and the ACC UNAVAILABLE message will display in the Electronic Vehicle Information Center (EVIC). Once the DTC changes from active to stored, the ACC system will return to normal operation. This DTC will clear after a 100 consecutive key cycles with the DTC stored.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.
CHECK FOR DTCs IN TCM
1. Turn the ignition on.
2. Using a scan tool, read TCM DTCs.

Are any DTCs present?

Yes

- Diagnose and repair DTC(s). Testing and Inspection.

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test.