DTC P0672 674 676 678 & GPCM Question? - Ford Powerstroke Diesel Forum
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Old 03-31-2013, 02:13 PM
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DTC P0672 674 676 678 & GPCM Question?

First off let me say hi to everyone as I'm new to the board.

So I got a Service Engine Soon light a couple weeks back. Pulled the codes in the thread topic. Ive researched it a bit and just now had the chance to go through it. I've pulled the GPCM green and black plugs/connector to test the circuits to the glow plugs. Here are the values


Black harness That connects to GPCM
Glow plug 8 - .5
Glow plug 6 - .3
Glow plug 4 - .4
Glow plug 2 - .4

Green Harness that Connects to GPCM
.4 / .4 / .5 / .6-7

The values from the connector to the glow plugs seem to be in range. Is it safe to say that the GPCM is bad and that is the part i should be replacing? Should I check something else?

Last edited by Frankie2knocks; 03-31-2013 at 02:22 PM.
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Old 04-02-2013, 10:47 AM
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Nobody? I was told by the service department that when the glow plug control module goes out, it affects both banks. Driver and passenger side. Mine is only the driver side, glow plugs 2 thru 8. Is it possible for the module just to lose one bank?
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Old 08-31-2013, 09:08 AM
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I am also getting the same codes on my 2008. Dealer said that it was the GPCM but I haven't replaced it yet. Did replacing the GPCM fix your problem?
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Old 09-02-2013, 04:36 PM
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Jshepp11 in my case, it did. I couldn't think of anything else to check so I just took the chance and bought the GPCM. Hope any of this helps you.
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Old 10-01-2013, 12:40 PM
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7.3 Hard Starting / Pours White Smoke

Hopefully, this is in the correct area...

I'm posting this because I saw a lot of "problems" and possible solutions, but very few post "this fixed it" after they find their solution.

I have a 2001 Excursion w/7.3 and when the temperature dropped, it started very hard, if at all. It poured smoke from the exhaust.

I had fault codes: P0678-P0671 and P1211.

I could NOT believe that ALL of the Glow Plug's on both banks went bad at one time, so I replaced the Glow Plug Control Module (YC3Z12BJ33AA) which seemed like the main thing that could affect all GP's.

My fault codes were cleared and all seems well.

Thanks for everybody that posted info on the 7.3, it definitely helped.
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