Circuit/System Testing
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. 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 PCM before replacing the PCM. Refer to Service Programming System (SPS) .
- If DTC P0602 resets, replace the PCM.
- Test the voltage and ground circuits to the control module for the following conditions:
- A short
- An open
- High resistance
- If all circuits test normal, replace the PCM.