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First off, I have a 2000 Excursion with a 7.3L so I have a GPCM and not a glow plug relay.
I'm getting a P0683 code. My SES light is on all the time. I have a voltmeter plugged into the dash outlet and based on prior behavior, it is definitely not lighting the glow plugs now. The voltage isn't dropping enough. It only goes down to 12.35v or so when the engine is cold. This time of year, it gets to around 70 during the day and 45 or so at night so the plugs aren't strictly needed. It starts without any problem at all.
I'm not sure what could be wrong. The connections are all tight to the GPCM. I've wiggled and pushed them in as far as they go. I recently did a lot of work to the engine, including new injectors, glow plugs, 38R, etc. and I've never had this code before doing any of that work.
I've read a bunch of threads on it... is there any way to troubleshoot this, or do I just get a new GPCM?
Can I convert to a GPR? I don't plan on having to pass CA smog as I'm probably moving at the end of the year.
Looks like GPCM communication circut?
I think I would check the wiring all the way from the GPCM to the PCM with an ohm meter. If that sounds like too much trouble you could could replace the GPCM and hope for the best. I don't like to spend money on parts I don't need. If the wiring checks out ok, it's likely the GPCM.
I feel your pain. I have been chasing the GPCM codes since I bought my truck. The difference is mine is running fine and the glow plugs are working. I believe my problem is the wrong PCM in the truck.
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