Rex Carrs
Junior Member
Howdy Forum! I have a 2019 Big Horn with 24,000 miles, and while doing 60 mph on the highway, the instruments went to zero, wipers started working, cooling fans locked on, and all the electronic module warning codes started displaying on the dash. It seems like the power steering is harder too, but not entirely certain. The final warning on the dash was to get where you're going and don't be surprised when the truck won't restart or shift to drive after you turn it off. The truck seems to hang onto the transmission gear that's active whenever the instruments go haywire. If you're doing 65 down the highway, then it'll seemingly do that forever. If you're in a parking lot, it wants to stay in 1st.
After checking on the job we were visiting, the truck restarted, and then did the same song and dance again. We took off the ground at the battery, shorted the positive to chassis ground (without the battery ground in place), which normally would reset the ECM (at least that works on older Jeeps and similar with internal memory), and then re-started. The truck seemed to work OK. Then the same song and dance happened again.
Filled the truck with gas after work (it was down to 1/8 tank), and it's run great since, no more evidence of any issues.
I checked for codes with my reader the next morning, and U-1817 is all that's there (I can't find much on that code aside from something that calls it a hybrid powertrain controller problem?!?), so I then took it to the dealer. The dealer said there are no active codes (which is true, there's only the history code at this point), and they can't troubleshoot without active codes. We described in detail everything that happened, and that the dealer would claim they can't troubleshoot without an active problem is total hogwash, but the story isn't over because nothing has been identified nor resolved.
So has anybody else had anything resembling this sort of issue?
After checking on the job we were visiting, the truck restarted, and then did the same song and dance again. We took off the ground at the battery, shorted the positive to chassis ground (without the battery ground in place), which normally would reset the ECM (at least that works on older Jeeps and similar with internal memory), and then re-started. The truck seemed to work OK. Then the same song and dance happened again.
Filled the truck with gas after work (it was down to 1/8 tank), and it's run great since, no more evidence of any issues.
I checked for codes with my reader the next morning, and U-1817 is all that's there (I can't find much on that code aside from something that calls it a hybrid powertrain controller problem?!?), so I then took it to the dealer. The dealer said there are no active codes (which is true, there's only the history code at this point), and they can't troubleshoot without active codes. We described in detail everything that happened, and that the dealer would claim they can't troubleshoot without an active problem is total hogwash, but the story isn't over because nothing has been identified nor resolved.
So has anybody else had anything resembling this sort of issue?
