Limp mode only when engaging in reverse (4xe)

[Zacreth]

So it happened once last week where I put the jeep in reverse trying to back into a spot. A whole bunch of lights switching off and on and cycling through different lights in the dash. Couldn’t go more than 20-23 mph on the dash when I was in drive.

it happened again the other day when going in reverse but putting it in P and turning it off and turning it back on seems to clear the issue.
I have a feeling the car is hot but just weird to experience in only reverse gear.

third time it happened and was in a parking lot trying to reverse in a spot and it completely died and I couldn’t turn the jeep off. I was able to put it in P but I couldn’t turn it off. I couldn’t shift it into R or D and after trying to turn it off and back on. The Run light on the push start was lit but wasn’t starting the car. I had to sit there for about 5 mins trying to turn it off and on and hoping to start the car since I was blocking traffic.
eventually it started and I was able to shift the car into R and get out of the way and into a spot.

I never experience this before and was wondering what people thought the root cause could be?

2021 4xe with 50k miles and all recalls completed

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[Zacreth]

*Update: there hasn’t been any replies so I’m providing an update as to what the dealership found out.

12V battery replace and fixed all issues….

 

[LAM]

Lower voltages from failing 12V batteries appear to be the cause of a high number of electronic problems, only worse for the hybrids. I would expect the logic boards to work well enough at lower voltages (3V, 5V or whatever) but these are connected to all sorts of analog modules which are less tolerant of the lower voltages. Once these start throwing errors the computer logic goes nuts.

Just a good reminder that one of the first things to check is the 12V battery.

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