GPCM
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
Pink one is the new one, the blue one was what the 'bad' one looked like. If ya look carefully, maybe you can see where the plastic is melted around the big pin. It was failing to make good contact to the GPCM...
Freshman User
Joined: Oct 2008
Posts: 43
Likes: 0
From: Highlands TX
Glow plug codes
My wifes excursion threw a cel today and after checking it discovered that I had the #2,4,6, and 8 glow plug trouble codes, with the glow plug control module also.
Any ideas? I see the control module is split for each head, i guess one of the connectors to the 2,4,6, and 8 cylinder could be bad and the other good?
Thanks
Any ideas? I see the control module is split for each head, i guess one of the connectors to the 2,4,6, and 8 cylinder could be bad and the other good?
Thanks
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
My wifes excursion threw a cel today and after checking it discovered that I had the #2,4,6, and 8 glow plug trouble codes, with the glow plug control module also.
Any ideas? I see the control module is split for each head, i guess one of the connectors to the 2,4,6, and 8 cylinder could be bad and the other good?
Thanks
Any ideas? I see the control module is split for each head, i guess one of the connectors to the 2,4,6, and 8 cylinder could be bad and the other good?
Thanks
9 times out of 10 if the codes are for all one bank it is a GPCM fault.
Freshman User
Joined: Apr 2005
Posts: 44
Likes: 0
From: Reston, VA
Replaced GPCM in time for winter...
Replaced my GPCM last weekend and the truck started up like a champ in the cold on the first turn of the key. Had to disconnect the Cold Air Intake to get to the 10 mm nut on the other side.
Bought mine from partsguyed.com. It was cheap and came fast.
Thanks for all the info in the prevous posts.
Later...
- Wayne
Bought mine from partsguyed.com. It was cheap and came fast.
Thanks for all the info in the prevous posts.
Later...
- Wayne
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Posting Guru
Joined: Aug 2007
Posts: 1,317
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From: Auburn, Wa
I was looking for a pic of the failed pigtails - none in my photobucket... I'll dig one out tomorow and take one.
Basically, the plastic around the big pins was melted and pins no longer made good contact. It was easy to see the problem when I looked at it.
REALLY made me want a simple freakin' GPR. 
LOL!
Basically, the plastic around the big pins was melted and pins no longer made good contact. It was easy to see the problem when I looked at it.
REALLY made me want a simple freakin' GPR. LOL!excursions and some california emissions 7.3's have a control module with individual output wires to each glow plug. Its supposed to help reduce the cold start emissions apparently, but its a whole boatload more complex than a GPR. Buy the stancor relay on guzzl'es mods page....well worth the cash and an easy install. For the GPCM ther is no cheap easy relacement
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