Lost several systems at once

[Jukebox]

Hoping someone can help me before I have to take to the dealer. Wife started our 21 JLU last week and dash reads “fuel sensor unavailable”, “TPMS unavailable”, “service 4WD”, “start/stop unavailable”, and the “check engine”. Jeep starts and runs fine. Thinking it would have to be a module or bus for all these system to stop communicating at once. Anyone have any ideas???
Edit: was able to pull code P0463 with an obd2- Fuel Level Sensor “A” Circuit High.

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[Alan W]

what were you able to find out?
did you just restart and it went away?

 

[Jukebox]

what were you able to find out?
did you just restart and it went away?

Nothing yet still showing the same. Hoping someone on here can help me get to the bottom of it.

 

[Ten North Prez]

 

[Ten North Prez]

I really don't have a clue but I'd be looking at the Aux Battery right out of the gate. I have seen a great deal of random sensor failures and trouble codes produced by these poor quality batteries throughout this forum and others. Likely wouldn't hurt to go to the fuse panel and give each one a push to make sure they are seated properly as well.
Hope you find the issue quickly.

 

[Jukebox]

Aux batt was my first thought. Voltage is good on it. Check all fuses for connection and made sure all relays are making. Thanking maybe a CAN buss issue, but not sure if any of them would affect communications of all these systems

 

[Ten North Prez]

You weren’t playing with a Tazer or the like, right?

 

[Jukebox]

No, the only thing I had done was hook up some lights to the factory aux switch about a month ago.

 

[Cuyose]

Maybe goes without saying, but remove your main battery leads for about a half hour, then go and reinstall, making sure they are good and snug and fire it back up. A dodgy ground connection can make the computer do all sorts of stuff.

 

[Jukebox]

Yeah that was my first thought. Disconnected for about an hour. Posts are clean and connections snug.

 

[Dyolfknip74]

Aux batt was my first thought. Voltage is good on it. Check all fuses for connection and made sure all relays are making. Thanking maybe a CAN buss issue, but not sure if any of them would affect communications of all these systems

How did you check aux voltage?

 

[Jukebox]

How did you check aux voltage?

Through the fender liner

 

[Dyolfknip74]

Through the fender liner

I hate to ask, but it was disconnected before metering, right?

 

[entropy]

Did you also check the main battery?. I had similar issues a couple years ago and everyone was telling me to check the Aux. Well, my aux was fine. but the main was out, it wouldn't hold charge.

Sometimes battery issues can be really hard to detect with these JLs because the dual battery system can mask issues. It did so with my Jeep. You have to disconnect the aux negative cable from the main negative post. Read voltages for both batteries and if you can, load test them. Then let it sit like that overnight and the next day, read the voltages again. They're connected in parallel and will keep each other charged if left connected.

You don't need to mess with the fender liner to check the aux voltage.

 

[Soggybottomboy]

OMG!!!!!!
LMAO!!!!

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