Diagnostic Aids

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ensure the transmission pass through connector and harness terminals are clean and not damaged, and the charging system is functioning correctly.
The transmission 24-way inline harness connector must be disconnected prior to disconnecting the transmission 16-way inline harness connector