One problem related to ignition has been reported for the 2001 GMC C2500. The most recently reported issues are listed below.
While replacing the fuel injectors under a special injector warranty, the dealership broke a glowplug off and called to say I need to replace the cylinder head at my cost. Call GMC customer support who say due to the age and mileage 2001, 124500. That the corrosion of the glowplug and the fact it seized in the cylinder head is not there problem, even though they are the one who designed the engine. They said that it's at my cost for a new cylinder head which was quoted to me over the phone at a price of $1,800. 00.