Intermittent Check Engine Light

[Spartan Synthetics]

I have a 22 Willys 3.6. It has 3400 miles. I have had a check engine light come on and go back off. Both times I was decelerating. It stays on a few seconds then goes off. The Jeep app doesn't report any issues on vehicle health. Any thoughts or similar experiences? I have had no other issues. This has happened 3 times in as many weeks. I only run non-ethenol gas because I don't drive it but a couple times week.
Thanks

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[jbehrn]

Good luck, I’ve been dealing this since I bought my 22 Rubicon:

https://www.jeepgladiatorforum.com/forum/threads/p0300-again.68580/

Finally caught a break and the CEL came on while driving near my local dealer. They diagnosed it as a P0300. It’s in the shop now waiting for a tech to diagnose the cause.

 

[ShadowsPapa]

I have a 22 Willys 3.6. It has 3400 miles. I have had a check engine light come on and go back off. Both times I was decelerating. It stays on a few seconds then goes off. The Jeep app doesn't report any issues on vehicle health. Any thoughts or similar experiences? I have had no other issues. This has happened 3 times in as many weeks. I only run non-ethenol gas because I don't drive it but a couple times week.
Thanks

It has nothing to do with anything as far as the light. It only matters in vehicles that sit a lot and the tank of fuel may last for over a month. Otherwise, it won't matter. In a month's time, you don't lose enough octane or light parts to matter because these are fairly well sealed systems.

But - a clue as to how little you drive it might be useful. When you do drive it, how far and how long do you drive it? Infrequent driving can lead to low battery voltage.

You don't have much useful information to go by. It could be anything from a wiring issue to a transmission issue to a engine issue to something else.

As far as the app showing normal, the app only reports major items and never anything that would be related to performance or a MIL (malfunction indicator light) that's transient especially. Don't expect it to be very helpful unless there's a major issue with a stored code and the light stays on. If it doesn't stay on and the issue isn't constant, it won't report it.

You need to get a code reader, or have some parts store see if there are any stored codes.
Basically, you are asking "why does my foot hurt" so it might help to have some specifics. Even including how far you've driven it when it happens, speed, engine warmed up or cold, etc.



A side note -
I wish that the industry would call it what it is - MIL (malfunction indicator lights), it's not a CEL like in the 1980s where all it did was light when the emissions systems needed maintenance.
Today, it may indicate any number of malfunctions that are tracked by any of the modules, transmission, engine, body, radio, you name it.
Mine came on a while back due to CANbus communications issues - nothing to do with engine or transmission.

 

[Barnaby’sdad]

My ‘22 JTR 3.6 (8,000 miles) does the same thing. It very rarely has a CEL pop-on. It first happened around 900 miles. I’ve only seen it once in the last ~5,000 miles though.

No codes have ever stored in my case. No idea what it is, but it happens so infrequently that I don’t lose sleep over it at this point.

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