dtc P0684 - Ford Powerstroke Diesel Forum
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Old 07-23-2013, 08:54 AM
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dtc P0684

i have this dtc keep popping up on my Mini Maxx and need to know where i should start looking. It runs as good as it always has and has no issues. It is the only dtc that comes up. Thanks for the help in advance guys.
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Old 07-23-2013, 09:04 AM
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This is the DTC and meaning:
•P0684 Glow Plug Control Module to PCM Communication Circuit Range/Performance

On my '01, due to it being a California truck, has a Glow Plug Module and I was getting this code until I changed the GPM out.

I'm guessing the 6.4L must have something like that also and it's having trouble talking to the PCM. Not knowing the 6.4L, I will be no help in finding the GPM. Hopefully, others who do know will help out.
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Old 07-27-2013, 07:49 PM
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thanks man. Any 6.4 owners out there willing to chime in?
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Old 07-28-2013, 06:10 PM
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Think it says in the owners manual where the wires are which color the wires are and their amp rating
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