dtc P0684 - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 07-23-2013, 08:54 AM Thread Starter
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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.


2008 Ford F250 CC Lariat
-H&S Mini Maxx
-S&B Cold Air Intake
-4" Flo Pro DP back (no muffler)
-Flo Pro EGR Delete Kit
-2 inch leveling spacers
-35x12.50-20 Nitto Trail Grapplers

BuIlT fOrD tOuGh
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post #2 of 4 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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post #3 of 4 Old 07-27-2013, 07:49 PM Thread Starter
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thanks man. Any 6.4 owners out there willing to chime in?


2008 Ford F250 CC Lariat
-H&S Mini Maxx
-S&B Cold Air Intake
-4" Flo Pro DP back (no muffler)
-Flo Pro EGR Delete Kit
-2 inch leveling spacers
-35x12.50-20 Nitto Trail Grapplers

BuIlT fOrD tOuGh
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post #4 of 4 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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