Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 GMC Yukon XL, 2015 GMC Yukon, 2015 Chevrolet Tahoe, 2015 Chevrolet Suburban, and 2015 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON.
- Verify DTC C111A 54 or C1114 00 is not set.
- If DTC C111A 54 or C1114 00 is set
Refer to the diagnostic procedure for DTC C1114 00 to diagnose this concern.
- If DTC C111A 54 or C1114 00 is not set
- If DTC C111A 54 or C1114 00 is set
- Verify DTC C111A 43 is not set
- If DTC C111A 43 is set
Replace the K133 Trailer Brake Power Control Module
- If DTC C111A 43 is not set
- If DTC C111A 43 is set
- All OK