Join Date: Mar 2009
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Do you think i have a bad GPCM??
Ok, a week or so ago i finished my head gaskets (cab removal). I also replaced all the glow plugs (Motorcraft) and both harnesses since i had the truck apart. The day after i finished the head gasket job the truck threw a P0676 code (cylinder 6 glow plug circuit failure). I cleared the code and it just comes back. I swapped the 2 connectors on the GPCM and threw a code P0683 (GPCM to PCM communication circuit). I then put the two connectors back to normal on the GPCM, cleared the code and now its throwing the first one again. Do you guys think i might have a faulty GPCM since i have all new glow plugs and glow plug harnesses???
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