Diagnostic Aids
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. 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.