2018 Expedtion Limited Hill Start Assist fault among others

[Jluigs]

My wife and I just bought a used 2018 Expedition Limited with 20k miles. A couple days after buying it, the vehicle will randomly show a bunch of random faults including “hill start assist” “traction control” “parking brake” and I think a couple others. We have taken it to the dealer and they have said the PCM is having a loss of communication somewhere between the 5 computer modules.

Unfortunately, this happens only intermittently while driving and the check engine light does not always stay illuminated. We left it with them for 2 weeks(got it back yesterday after it taking too long to find a fix). The dealer contacted Ford hotline and they gave them a sequence to follow and try to narrow down where the initial fault is happeneimg. Unfortunately to do that, the technician has to have diagnostic tool plugged in and have the fault occur while he is driving it in order to identify the culprit. Like I said we had it in for 2 weeks and they couldn’t get the car to throw the fault...and of course the next day while driving, the car jolted(feels like transmission slips) and threw the same exact faults that you have to hit “ok” to clear.

My wife is frustrated with this entire process as she thinks it’s stupid to pay that much for a car and them not be able to fix it. Have any of you all experienced this on the new expeditions? There have been now aftermarket mods made with leveling kit etc. please help!!

 

[cmiles97]

If they can't recreate it or used the stored codes, have them, if not cumbersome, leave the diagnostic tool in the Expy for it to record the "event".

Other than that, take a picture or recording of the dash when it happens and force them via Ford customer service to drive it until they can reproduce the issue. No way you should be driving a vehicle that jolts.

Also I work in the building automation/SCADA field and there are tools and software that can be used to test communication between modules. Heck even the modules themselves will let you know that they have comm issues. I'd be surprised car manufacturers can't utilize similar.

It also makes me wonder, since it's an 18 with low miles, that it was a "buy back" because of these issues. See if they can pull the service history on it.

 

[aggiegrad05]

It also makes me wonder, since it's an 18 with low miles, that it was a "buy back" because of these issues. See if they can pull the service history on it.

Or just run the CarFax on it.

 

[Uturn]

Judging from the codes, I would assume it to be a intermittent wheel speed sensor.

 

[bridgerider]

I have a similar issue with a number of faults being thrown and in addition the instrument cluster and the map screens go black. My post is here: https://www.expeditionforum.com/threads/major-electronics-issue.38922/. Nothing helpful to you I know, but it is not a unique problem.