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Old 06-27-2010, 01:14 AM   #1
JoeDirte
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codes po678, po676, po674, po672

Hi Guys, My ses light came on and pulled codes po678, po676, po674, po672. The truck runs fine and sounds fine. I'm assuming the harness came loose. I took a look at the left side cover and see the harness on top of the valve cover. That's the one, right? I also see a smaller cover on top of the valve cover. Does part of the harness run through that? I've read guys using a zip tie to hold the harness under the valve cover. Anything else to check?
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Old 06-27-2010, 11:52 AM   #2
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That is your glow plugs on those cylinders.

Could be the harness is loose or the GPR is bad or the plugs are toast or . . .

See this thread for codes - http://www.thedieselgarage.com/forum...read.php?t=762

and this one - http://www.thedieselgarage.com/forum...ad.php?t=16268

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Old 08-22-2010, 09:31 AM   #3
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I replaced the vc gasket and uvch. Since those didn't do the trick, I bought the motorcraft DY876 gp module. A 10 minute swap and so far the SES light did not come back on. I saved the old vc gasket and the old uvch in case I ever need it in the future.
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