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How to test the GPCM 2007 f250
I have a 2007 F250 that is telling me the GPCM may be bad. (California model P0683). Truck starts and runs just fine most of the time, but it hasnt been under 75 degrees since the light just came on. Just a small shudder on start up every once and a while.
How do I test the GPCM? I have searched and searched, but cant find an answer, just ways to test the GPR, but the California model has the GPCM instead.
Any instructions would be much appreciated!