Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Engine ON, the scan tool Ignition 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 circuit or short to ground.