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.

Engine ON, the scan tool Control Module Voltage parameter should display between 12.5-14.5 volts.

If the voltage is not within the specified value, test the Ignition Voltage circuit for an open, high resistance, or Short to Ground.
If the voltage is within the specified range, replace the PIM.