Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Start the engine.
- Using the scan tool, observe the 42V Circuit Voltage parameter on the APM data list.
- If the 42V Circuit Voltage parameter is greater than 48 volts, replace the APM.
- If the 42V Circuit Voltage parameter is less than 48 volts, replace the PSCM.