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I have a 2012 F250 diesel. While the truck was running, the instrument cluster started tweaking (term dealership used). Every gauge started going up and down and every code possible started popping up. Dealer has had the truck for two weeks and cannot figure it out. has anyone seen or heard of this happening? The only aftermarket item on the truck is an airbag lift kit with remote. Pretty sure they ruled that out all ready.
Wiring harness by the parking brake there are a bunch of threads on here about this and the trucks going crazy and throwing a bunch of codes. The dealer should know about this by now been happening since 2011 and on gas and diesel trucks.
Yep, a couple of plugs in the harness by the parking brake. Take them apart & put back together a few times, give them a good wiggle. Remove clips that holds harness to parking brake pedal assembly, wire tie harness to something else.Did this fix 3 years & 90,000 miles ago to the 2013 F250 I drive & the problem hasn't come back.
I think there was a tread or two on the subject in the 6.2 gas engine section of the forum.
Dealership has told me they think it’s the auxiliary coolant heater. I’ve asked them about the wiring harness at the break peddle assembly and they tell me they have checked it. Not sure I’m buying it. Anyone hear of the auxiliary coolant heater causing this problem? Thanks for the replies.
I’ve never even heard of an aux coolant heater. There is the engine block heater which does heat the coolant when plugged into an electrical outlet, and the rapid supplemental cab heater which as I understand it heats the air in the hvac ducts
to give to heat in the cab faster when it is cold. That being said I’m not that fimialr with the 6.7 but I don’t think that’s a thing and neither does google, someone correct me if I’m wrong but I think they’re full of it.
Turns out it is the supplemental cab heater. Took them 24 tech hours to figure that out. Now they are trying to get Ford to help cover cost because the truck is out of warranty. Gotta love it.
I had the same issue, however, it was a 2013 Fusion. The end result was a wire harness was routed incorrectly and it was rubbing against something causing the short. Harness was replaced and I've had no issues in 4 yrs
Don't let them throw parts at it. Some of these service departments don't know much more than how to run the checklists. Tell them you want any parts they remove and when you pick up the truck have them explain how a bad heater caused your dash to 'tweak'. The dealership here is fairly good with trucks, but one time they insisted the daytime running light resistor pack was causing my low beams to be inoperative. They were just running the checklist and found the resistor pack ohms to be OOT. I asked the tech to explain how that was causing my issue, he pulled out a wiring schematic, studied it for about 5 minutes, then said "I guess it can't". I made them take it off my bill.