Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Low voltage or a momentary loss of power or ground to the ECM may cause a DTC to set.
- Verify that the battery cables are clean and tight, and the battery is fully charged. Refer to Battery Inspection/Test .
- Verify the ECM ground circuits do not have an open or high resistance.
- Verify the ECM power circuits do not have an open, short to ground, or high resistance.