Glow plug ckt fault code po678 - Ford Powerstroke Diesel Forum
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Old 07-21-2011, 05:25 PM
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Unhappy Glow plug ckt fault code po678

The other day I got CHECK ENGINE SOON light.
So I did, the obd2 reader said (PO672-674-676-678).
This is cylinders (2-4-6-8) right bank,glow plug ckt fault per book.
All my fuses are good, tested them all.
The 9 pin connector to the valve cover is tight no bare wires.
No Loose wires. i need some instruction.
Truck is 2000 f350 crew 4x4 7.3l 125,00mi.

Last edited by bbgun; 07-21-2011 at 05:57 PM. Reason: basic data for truck left out.
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  #2  
Old 07-21-2011, 05:34 PM
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I'm confused. What year/engine do you have? I'm guessing a later 7.3 since you mentioned a 9 pin connector. You must have a CA emissions style engine that uses a glow plug module, instead of a glow plug relay. If this is the case sounds like your glow plug module might be taking a crap.
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Old 07-21-2011, 05:59 PM
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Yes sir! Seems like that's what most people find when you log codes for a whole bank. Probably worth a shot replacing it.
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