P0676 Glow Plug Code
Hotshot
Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
The #6 GP is on the drivers side. You may want to take a look at this thread to see how to check your system, it will help you determine what exactly needs to be replaced.
https://www.ford-trucks.com/forums/7...pr-system.html
https://www.ford-trucks.com/forums/7...pr-system.html
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Drivers side is 2-4-6-8 front to rear. You could get by with just replacing one, but if you've got the money, might as well do all 4 on that side. I take it you have a CA truck or excursion telling you the #6 is bad?
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
You must have this, a GPCM (Glow Plug Control Module) if you are getting an individual GP DTC.
Try re-seating the connectors for the even number cylinders at the GPCM and the UVCH. If you still get the 0676 and everything ohms out good from the GPCM connector to the #6 GP try this.
Another poster was getting the same 0676 DTC but the #6 GP ohmed out OK. I told him to swap the connectors at the GPCM. He did and got the same 0676 DTC again. This pointed to the GPCM. If he had gotten an 0675 it would have pointed to a problem between the GPCM and the glow plug. He posted back after replacing the GPCM that he had no more GP DTCs. This is also a good way to test the GPCM no matter which GP or GPs may show bad.
Just want you to be able to check all you can before pulling a valve cover.
Try re-seating the connectors for the even number cylinders at the GPCM and the UVCH. If you still get the 0676 and everything ohms out good from the GPCM connector to the #6 GP try this.
Another poster was getting the same 0676 DTC but the #6 GP ohmed out OK. I told him to swap the connectors at the GPCM. He did and got the same 0676 DTC again. This pointed to the GPCM. If he had gotten an 0675 it would have pointed to a problem between the GPCM and the glow plug. He posted back after replacing the GPCM that he had no more GP DTCs. This is also a good way to test the GPCM no matter which GP or GPs may show bad.
Just want you to be able to check all you can before pulling a valve cover.
Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
Originally, I got the GPCM code and it went away. After that, it kept pegging #6 as the bad one even though it has been changed, ohmed all the way from the GPCM. I had to change the GPCM and it was fine.
Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
Have you ohmed the connections from the plug to the negative terminal? If all the GPs test out good, it must be the GPCM.
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Post Fiend
Joined: Nov 2007
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From: Payson, AZ
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New User
Joined: Nov 2009
Posts: 1
Likes: 0
I have the same problem. code p0676 came up and I changed glow plugs, checked harness and uvch and every thing ohms and looks good. I swapped the green and black at the gpcm and the P0676 went away and it coded P0683. Did a new gpcm fix your problem?
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