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Discussion Starter #1 (Edited)
I have an 03 2500 HD Duramax CC 4X4 SB with California emmisions , mods include : Edge Jucie with Attitude monitor, Volant cold air intake, 4" turbo back exhaust, & PPE boost valve. I recently got a code saying glow plug heater circut malfunction. I also noticed that the intake heater plug was corroded & it appears to have shorted out. I have checked the 175amp fuse under the hood & it appears good. I have heard of a GCM, and was wondering if it is the box over the rear of the driverside valve cover? Also if that is it, how do i test it? If it is bad where is the best place to get one , & whats a fair price? If its good what next? Intake heater ?

Thanks in advance. :thumb
 
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