Hi all,
Just replaced all my glow plugs on my 2006 2500HD and still get the engine light and error message telling me the #1 cyl glow plug was bad. I know the glow plug is good so where do I go now? Engine has 133000 miles on it
If you are 100% sure you have a good glow plug (as in, you checked continuity and verified it is good), then you either have a connection problem or a bad module.