Circuit/System Testing
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.
- Observe the DTCs with the scan tool.
- If DTC P0602 is set, attempt to program the ECM before replacing the ECM. Refer to Service Programming System (SPS) .
- If DTC P0602 resets, replace the ECM.
- Test the voltage and ground circuits to the ECM for the following:
- A short
- An open
- High resistance
IMPORTANT:
An intermittent or momentary, less than 1 second, loss of system voltage during throttle tip-in may set DTC P060D.
- If all circuits test normal, replace the ECM.