GPCM Replacement
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.
If the glow plug controller (GPCM) is replaced, the following procedures must be performed.
Fuel Injector Flow Rate Programming for fuel injector flow rate programming