Diagnostic Aids
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis 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.
- If the SDG module becomes inoperative, the drive motor generator battery control module will set DTC U1862 and other modules will set loss of communication DTCs against the SDG module.
- If serial data is lost between the SDG module and the drive motor generator battery control module multiple modules will set loss of communication DTCs against the drive motor generator battery control module.