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Ok I just tested all 8 plugs via the black and green connectors at the GPCM. Each one checks out 100%. Which is a relief, my harness must be ok and the plugs themselves are ok. Must be the GPCM. Some monkey lost the pink piece on the green connector in the past Looks like I had a two part problem.
I recently got a P0671 code. It's been approximately 5 years since I last changed my glow plugs and harnesses. Since it isn't too expensive, I am going to change them again. I'm on the fence as to weather or not to change the module too, just trying to save some money. Any thoughts or suggestions? Thanks
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Looks like I had a two part problem. 
P0671
