Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis 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.