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Two weeks and 470 miles of Jeep ownership and already a Check Engine Light

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Any chance you or a dealer pressure washed the engine bay?
I don't think so. I've had it 6 weeks now and just crossed 900 miles. I initially thought it was the battery, but it tests fine. I'm more inclined to think it's the infotainment system now. I was disappointed that the cel went away before I could get back home and check it. Next time I will check it before I go to work.
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All of the CANbus connectors are ok?
 
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All of the CANbus connectors are ok?
I have not checked any connections. The vehicle has done this 3 times now. The first time at 470 miles, the third time at 900 miles, and the second time was some time in between. I may just have to schedule a visit to the dealer or wait until it breaks and stays broken.
 

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I have not checked any connections. The vehicle has done this 3 times now. The first time at 470 miles, the third time at 900 miles, and the second time was some time in between. I may just have to schedule a visit to the dealer or wait until it breaks and stays broken.
I’d start with checking that every single fuse is seated tightly. Then drive it without any more changes. If it doesn’t fix it, and it’s brand new, I’d let the dealer fix it.
 

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I’d start with checking that every single fuse is seated tightly. Then drive it without any more changes. If it doesn’t fix it, and it’s brand new, I’d let the dealer fix it.
Dealer fixed mine when it was kicking shifter and other errors randomly at startup - they removed the glove box and did something with the CANbus star connectors. They never wrote it up, but I found evidence they had taken things apart, the glove box contents were rearranged, someone had been in the passenger seat, and other clues.
I asked "did you guys look at xxxx" when I went to pick it up.
The response - yeah, they took care of that for you. But it was never on a ticket, and I've not had a single bus-related issue since.
 

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Dealer fixed mine when it was kicking shifter and other errors randomly at startup - they removed the glove box and did something with the CANbus star connectors. They never wrote it up, but I found evidence they had taken things apart, the glove box contents were rearranged, someone had been in the passenger seat, and other clues.
I asked "did you guys look at xxxx" when I went to pick it up.
The response - yeah, they took care of that for you. But it was never on a ticket, and I've not had a single bus-related issue since.
Glad they fixed it, but it would drive me nuts to not know the solution.
 

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Glad they fixed it, but it would drive me nuts to not know the solution.
Yeah, I asked more than once, and the service guy said it's all on the work order............ uh, no, it wasn't. Don't know why it wasn't - why not list it and get paid for it.
 

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Yeah, I asked more than once, and the service guy said it's all on the work order............ uh, no, it wasn't. Don't know why it wasn't - why not list it and get paid for it.
Annoying. But still. Glad it’s fixed.
 

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Another day, another two CEL codes.

20241202_180431.jpg


20241202_180436.jpg
Fuel system codes, it's staying in open loop. Perhaps due to the O2 sensor on the passenger side (bank 1 is on the right side)
Do you have a valve cover oil leak getting to the O2 sensor connector?
In any case, there's an issue over there with that bank.
 

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Truck is brand new. No mods except bumper and winch. Just turned over 1300 miles, and this is the 4th check engine light. This one came up while it was running. The previous CELs came up on startup and would not allow me to shift into drive. This vehicle is a lemon. I am going to keep my code reader in the vehicle and start documenting the codes. I also wonder why my code reader is unable to erase the codes.
 

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Fuel system codes, it's staying in open loop. Perhaps due to the O2 sensor on the passenger side (bank 1 is on the right side)
Do you have a valve cover oil leak getting to the O2 sensor connector?
In any case, there's an issue over there with that bank.
I had similar codes when it misfired due to bad coil packs. Several codes that seemed to make no sense, and seemed unrelated and impossible. I had one code that said my o2 sensors were hooked up in reverse. Ridiculous. Replaced the bad coil packs, and no more problems of any kind. Some of these codes happen because the ecu assumes if one problem occurs, the other probably does as well.
 

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Truck is brand new. No mods except bumper and winch. Just turned over 1300 miles, and this is the 4th check engine light. This one came up while it was running. The previous CELs came up on startup and would not allow me to shift into drive. This vehicle is a lemon. I am going to keep my code reader in the vehicle and start documenting the codes. I also wonder why my code reader is unable to erase the codes.
I wouldn’t erase any codes. Just go to the dealer and have them fix it. It’s brand new. And the misfire codes will just return after you erase them. Because they’re happening again.
 

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I had similar codes when it misfired due to bad coil packs. Several codes that seemed to make no sense, and seemed unrelated and impossible. I had one code that said my o2 sensors were hooked up in reverse. Ridiculous. Replaced the bad coil packs, and no more problems of any kind. Some of these codes happen because the ecu assumes if one problem occurs, the other probably does as well.
The O2 voltage high could indeed mean a rich condition, the other indicates there's a problem causing it to not go to closed loop.
So if there's enough misfires, it's going to send unburned fuel out the exhaust, causing the O2 sensor voltage to rise.

I'd love to have jscan on that and see what the misfire counts are on that bank.
It should even tell if it's an ignition misfire or not.
It did on our Grand Cherokee a few years ago - clearly said "ignition misfire".

It indeed needs to go back to the dealership - they should be able to read a lot more information, even capture a freeze frame giving more details.
 
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I wouldn’t erase any codes. Just go to the dealer and have them fix it. It’s brand new. And the misfire codes will just return after you erase them. Because they’re happening again.
I've driven about 300 of the 1300 miles with a CEL. I traded in a 2016 BMW that NEVER had any CELs, and now I have a Jeep with 1300 miles, and I've had a CEL lit up on my dash for about 25% of the time. It's maddening. I knew better than to buy a Jeep, but I couldn't help myself. I'm about to find a 10mm wrench here at work and disconnect the battery.
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