Join Date: Jun 2008
Location: Brampton, Ontario, Canada
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Without a lot of information, you are asking a very difficult question that I don't think anyone (myself included) is going to be able to give you a definite answer to.
First off, what is the model year and mileage of the vehicle in question? I'm assuming it has a 6.0L in it, since you posted your question in THIS forum.
Secondly, does this vehicle have any modifications?
Third, what were the specific DTC numbers retrieved?
Fourth, and this may sound like a stupid question, but what is the condition of your batteries? Believe it or not, low battery voltage will cause all kinds of funny symptoms. I prefer the "KISS" philosophy (Keep It Simple Stupid).
For what it's worth, any 6.0L that has landed in my hands with a DTC set for a specific glow plug has always ended up being the GPCM (Glow Plug Control Module) needing replacement (Ford part number DY-876).
Ford Diesel/Senior/Master Tech who placed 2nd overall in Ontario on the Fix-It-Right-First-Visit score for 2010
....who works at a dealership that now employs SOME half decent looking female employees since they overhauled most of the administrative staff
....but STILL loves hot women with big boobies
....and STILL hates working on E-Series with 6.0L