mwilk012
Well-Known Member
in parallel with the main battery supporting all 12v loads. It isn’t until ESS kicks in that the auxiliary battery and main battery are separated.Doing what?
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in parallel with the main battery supporting all 12v loads. It isn’t until ESS kicks in that the auxiliary battery and main battery are separated.Doing what?
which computer?It turns out there's something wrong with the computer. The Jeep dealer can't get it & the factory techs are now working on it.
If you have issues again I'd avoid that dealer. IMO, likely battery or fues/fuse array, given the variety of electrical stuff.Just got a call that my Jeep is fixed. Said they had to reprogram the main computer. Jeep said it's probably cuz of my 37's. Said if it happens again, I'll have to go down a size. That is total bullshit. We'll see if it happens again & then start fighting.
The dealer is actually a best friend of mine. He agrees that Jeep is trying to make excuses and said we'll cross our fingers & hope we don't have to start fighting with them. When I took it in, the service manager said it sounds like a battery & figured it would only take a few hours to get it all checked out. It ended up taking a week. We'll see. The dealer put 35's on it & regeared with 4.56's when I bought it new.If you have issues again I'd avoid that dealer. IMO, likely battery or fues/fuse array, given the variety of electrical stuff.
If a single bank is reporting a lean condition, the problem lies in fuel control or a vacuum leak at the intake manifold. Vacuum leaks at the manifold ports themselves are extraordinarily rare on modern intake designs. Probably a bad O2 sensor. Check for oil leaks.My '21 with a 3.6 ESS and newly installed K&N CAI ran fine for about 10 days. Then got a CEL with a P0171 System too lean (Bank 1), Random misfire (Forgot code) and P2026 Post catalyst fuel trim system too lean. Cleared codes. Ran fine for about two weeks. Removed the muffler and put on an AFE Hi-tuck tailpipe. Ran fine for about a week and it did it again. It happened when I was out on mild 4wd Forest Service roads going slow (prolly never got out of 3rd gear on automatic). Felt it starting to miss, No other abnormal engine readings. I noticed volts dropped to around 13.5 and WOULD NOT get back up to 14. Any ideas?
Might be a pain, but you could try swapping back to stock muffler and intake for a few weeks and see if it still comes back. At the very least, I'd probably completely reinstall the intake just to make sure nothing's weird (leaks, rag stuffed inside the filter, anything unusual). Seems odd that either would cause a problem since the ECU should eventually adjust to the increased airflow. Not sure about the JL, but with many other vehicles this occurs quicker if you disconnect and then reconnect the battery.My '21 with a 3.6 ESS and newly installed K&N CAI ran fine for about 10 days. Then got a CEL with a P0171 System too lean (Bank 1), Random misfire (Forgot code) and P2026 Post catalyst fuel trim system too lean. Cleared codes. Ran fine for about two weeks. Removed the muffler and put on an AFE Hi-tuck tailpipe. Ran fine for about a week and it did it again. It happened when I was out on mild 4wd Forest Service roads going slow (prolly never got out of 3rd gear on automatic). Felt it starting to miss, No other abnormal engine readings. I noticed volts dropped to around 13.5 and WOULD NOT get back up to 14. Any ideas?
This.Dave, your description of error codes and dashboard warning lights (post #16) does suggest a battery that is reaching the end of its practical service life. Yes, perhaps it's occurring prematurely, given that you have a 2021 Jeep, but such failures can manifest themselves in seemingly unrelated ways.
While the expense can be an annoyance, do consider the idea of replacing one or both batteries as a prophylactic measure. Doing so in my own vehicles has solved issues similar to your own. Granted, I was trying to squeeze the last volt out of my batteries before investing in a quality replacement.