GP 2 4 6 8 Circuit Fail??
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Posting Guru
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From: Herndon KY
GP 2 4 6 8 Circuit Fail??
Gentlemen,
Got a CEL on a 00 Excursion and the code alluded to the entire bank of glow plugs being out, but the truck starts and runs smooth even below freezing, it came back after resetting, any ideas?
Got a CEL on a 00 Excursion and the code alluded to the entire bank of glow plugs being out, but the truck starts and runs smooth even below freezing, it came back after resetting, any ideas?
Post Fiend
Joined: Mar 2007
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From: Texas
You can ohm the glow plug wiring to see if you have any bad plugs, but if it starts fine in cold weather with no white smoke, then it sounds like you've got a bad GPCM for the entire drivers bank to be down at once. What exact codes did you get?
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From: Herndon KY
Ill have to check again I didn't write down the codes. So where is the GPCM, what does it do and how hard is it to replace,
I don't know if its a cali model, don't even know how to check
I don't know if its a cali model, don't even know how to check
Post Fiend
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From: Texas
Post Fiend
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From: Payson, AZ
If you swap the two connectors on the GPCM and the same codes for GPs 2-4-6-8 come back then you have a bad GPCM. I doubt you have 4 bad GPs or a connector or harness that is affecting all 4 GPs. A bad GPCM will show one whole back or the other bad.
Edit: If you swap them don't forget to swap the back.
Edit: If you swap them don't forget to swap the back.
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Posting Guru
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From: Herndon KY
good tip payson, I will give it a shot, the next question I have is do I have to replace it? The system seems to work fine....
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Post Fiend
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From: Payson, AZ
It you are sure the GPCM is heating the 2-4-6-8 GPs there would be no reason to replace it but if you have trouble starting during the next cold spell you will know where to look.
Post Fiend
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From: Texas
Unless he has a vehicle inspection coming up. They typically won't pass an inspection with the CEL on.
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From: Payson, AZ
Post Fiend
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From: Payson, AZ
Thanks for the thought.
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From: Houston, Texas
All Excursions equipped with the 7.3 are California trucks, why Ford did that is beyond me, but who am I to question them...
It's on the passenger side of the engine and as F350-6 said, it has a Black and Green connector going to it: two plugs, two bolts, ten minutes, and you're back on the road. You can get the part off flea-bay for a reasonable price as I'm sure the dealer may want your first born.