GPCM troubleshooting
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Fleet Mechanic
Joined: Aug 2010
Posts: 1,461
Likes: 158
From: Sedalia, CO
GPCM troubleshooting
Pretty sure my GPCM is bad, but thought I'd bounce symptoms off the 'hood...
SES light came on yesterday, with codes P0672, P0674, P0676 and PO678 - all four glow plugs on the driver's side. Cleared codes with Torque (I love that app!!!), they came back on the second key cycle. With KOEO this morning, I noticed the rear (green) plug to the GPCM was hot, the front (black) ones was stone cold.
Should I click "submit" on my order to Clay for a new GPCM?
Mark
SES light came on yesterday, with codes P0672, P0674, P0676 and PO678 - all four glow plugs on the driver's side. Cleared codes with Torque (I love that app!!!), they came back on the second key cycle. With KOEO this morning, I noticed the rear (green) plug to the GPCM was hot, the front (black) ones was stone cold.
Should I click "submit" on my order to Clay for a new GPCM?
Mark
Thread Starter
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Fleet Mechanic
Joined: Aug 2010
Posts: 1,461
Likes: 158
From: Sedalia, CO
Thanks Trey. Are you thinking the UVCH could be loose? The truck had the $.05 mod done by a shop a few years ago. (The $.50 mod was too expensive, so the guy used zip ties. 
) It seems odd that the thing would come loose in such a way that the outside pins, and only the outside pins, on each side of the connector were disconnected, and all at the same time. Or are you thinking something else?
BTW, I ran the AE glow plug test this morning, but all it told me was that I had 0672, 0674, 0676 and 0678.
Mark
) It seems odd that the thing would come loose in such a way that the outside pins, and only the outside pins, on each side of the connector were disconnected, and all at the same time. Or are you thinking something else?BTW, I ran the AE glow plug test this morning, but all it told me was that I had 0672, 0674, 0676 and 0678.
Mark
9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
Thanks Trey. Are you thinking the UVCH could be loose? The truck had the $.05 mod done by a shop a few years ago. (The $.50 mod was too expensive, so the guy used zip ties. ) It seems odd that the thing would come loose in such a way that the outside pins, and only the outside pins, on each side of the connector were disconnected, and all at the same time. Or are you thinking something else?
BTW, I ran the AE glow plug test this morning, but all it told me was that I had 0672, 0674, 0676 and 0678.
Mark
) It seems odd that the thing would come loose in such a way that the outside pins, and only the outside pins, on each side of the connector were disconnected, and all at the same time. Or are you thinking something else?BTW, I ran the AE glow plug test this morning, but all it told me was that I had 0672, 0674, 0676 and 0678.
Mark
Thread Starter
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Fleet Mechanic
Joined: Aug 2010
Posts: 1,461
Likes: 158
From: Sedalia, CO
The pigtails look good - pretty much new - and all four glow plugs on the passenger's test between .9 and 1.1ohms, when measured at the pigtail.
For those interested, and with credit to Woodnthings, here's the glow plug circuit:
What happened to IMG tags on this site? The pic is from this great document.
Mark
For those interested, and with credit to Woodnthings, here's the glow plug circuit:
What happened to IMG tags on this site? The pic is from this great document.
Mark
Thread Starter
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Fleet Mechanic
Joined: Aug 2010
Posts: 1,461
Likes: 158
From: Sedalia, CO
Ordered a new GPCM from Clay a (very) few days ago, and installed it tonight. Problem solved, as far as I can tell after half a dozen key cycles and a test drive. No more SES light, no codes stored.
Thanks all!
Mark
Thanks all!
Mark
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Congratulations! It's always best to be sure you have the target centered in the Buck$Zooka scope before pulling the trigger. Nice BDA. 
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