Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: This diagnostic assumes the following:

The batteries are completely charged. Refer to Battery Inspection/Test .
The cranking speed is within specifications. Refer to Engine Cranks Slowly .
There is adequate fuel in the fuel tanks.

If DTCs P0090, P0191, P0193, P0335, P0336, P0340, P0602, P0603, P0604, P0606, P0642, P0643, P064C, P0698, P0699, P2510 are set diagnose those DTCs first.
The engine starts and runs.
- If the engine does not start and run perform the Circuit/System Testing.