Diagnostic Aids (ECM)
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- A low voltage DTC in multiple modules indicates a concern in the charging system.
- Inspect the ECM ground connection G106 (4.3L LU3) or G103 (all other engines) to ensure that they are clean and tight.