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DISCLAIMER: This is not a brag, but the latest PCM flash fixed all my issues—and I've been driving it for almost 1,000 miles since getting it back. No (@!), no CEL, even the knock, hard idle, and poor shift points are gone. It purrs. I just want to give others hope that the PCM flash may solve...

This makes so much more sense to me. I had/have the exact same experience. I'm now stuck running high-octane. If I go low-octane for a fuel-up, it knocks around like a bat.

I posted about this Flash over in the Survey- For those with misfire issues thread on Oct 15, 2020 as the solution to my ESS, shifting, engine lugging, and P0300 problems—but you describe the changes a lot better than I did. This Flash makes the JT drive like—I assume—it was always meant to...

Just took mine to Leith Auto Park Chrysler Jeep (to handle that dreaded misfire problem, no less). Service advisor was knowledge and helpful. 10/10 will go to that dealership again (at least until the warranties run out).

Oh shit. I was hoping they fixed it for the 2021 model years (also didn't even know next year's models were on the lot). Did you literally buy it over the weekend?

A few days and few hundred miles since the dealer installed the powertrain control module flash per TSB 18-053-20 REV. B, and I'm happy to report all symptoms are gone. Here's the TSB and the invoice for JTs w/ similar symptoms and January 2020 build date. Hoping it can help someone else.

Got my JT back after 4 days at the dealer. Invoice states: - Couldn't replicate the (@!) or misfire, but installed the flash per TSB 18-053-20 REV. B. Seems to be running at 500 higher RPM, which I actually thought would have helped from the beginning - Road tested it and heard my knock...

JT performed admirably along the northern tip of the OBX all last week, even though the ESS light popped on once (I forgot to turn ESS off manually at startup). No CEL all week, but a repetitive knock at low RPM developed (b/t 1k-2k RPM). Taking it to a dealership that's worked on a JT w/...

I notice significant differences when I put in 89 octane fuel or higher—it idles better, shifts smoother, and accelerates faster. It sucks, but I'm not putting in anything less than 89 into this engine ever again.

No lift b/c it's mainly a family commuter car (40 miles daily) that we bought to give us unlimited OBX access. I don't want to make the existing (already garbage) MPG worse with lifts and bigger tires. But going 15mph on beaches w/ a speed limit of 35 was a bummer. We bottomed out constantly if...

Reporting in after nearly 1k miles since my 5th ESS light and first CEL light. I turn off the AS/S feature (manually) at startup, and no lights have occurred at all for 1k miles—no ESS, no CEL. Wish I had the fancy AS/S memory that one of y'all mentioned, but turning it off manually is a...

Do you hear that "pinging" from inside the cabin, or only when you pop the hood? And can you describe the sound a little more?

This log could have been from my JT, lol. Did you feel a misfire when the cel registered?

As others have mentioned, the widespread nature of the symptoms (w/ the only common denominator being the AS/S and CEL) makes me think there are so many degrees of... I don't know... morbidity? Like, I've only experienced the AS/S and CEL issue and 1 misfire. No clanking, no hard idling, no...

This is exactly why I'm afraid of even raising this issue on my JT with a dealership! I traded in 2 family cars for an off-road machine that can get our family across a beach. Some crossover loaner for 4 hot summer months just won't do.

400 miles since last ESS and CEL—all w/ auto-stop/start turned off—and haven't had any (@!) or CEL since. Really thinking this is a big-ol' bug with the auto-stop/start system.

Build date: 1/20 Mileage when it first occurred: CEL = 3,650, but ESS >3x from ~2,000+ How many times has it occurred: CEL = once. ESS = >3x What exact codes did it throw: P0300 Is the issue on going? N What has been done to try to solve the issue? Checked code at home, cleared code, and I now...