GPCM Replacement
WARNING: This page is about a different car, the 2006 GMC Sierra, 2006 GMC Cab & Chassis Sierra, 2006 Chevrolet Silverado, and 2006 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
If the glow plug controller (GPCM) is replaced, the Fuel Injector Flow Rate Programming must be performed. Refer to Fuel Injector Flow Rate Programming .