Hi, I suddenly started getting misfire on cylinders 2,4, and 8 and a “random misfire” on my ‘12 Supercharged. Codes as per my Gap IIDTool.

I checked all codes yesterday because I heard a thump from the rear and wanted to see if there was a code on the air spring or shock and there were no engine codes at that time. (This may have been a random thing thrown up by the tires that I didn’t notice in the road?).

It has a slight hesitation when in low RPM and going uphill until it downshifted, for the last 2 days.

I drove a fairly bumpy dirt road in the American Southwest this morning and the check engine light came on when I restarted the car after a 20 minute snack break after an hour or so of that road. That’s when I checked the codes and saw these.

So my thinking is something may have been knocked loose on the bumpy road especially since those are all on the same side (I believe the right side of the car?).

Given that all those cylinders plus the random one started at the same time, I’m guessing it is not a bunch of coil packs or spark plugs or injectors that all decided to quit at exactly the same time.

I can’t hear a vacuum leak but am getting a ticking at idle.

No smoke at all but there is a slight smell of what may be burning oil if the car is running hard like extended uphill in the mountains out here.

I filled the gas tank just before driving the dirt road so wondering if maybe bad fuel?

Any recommendations are greatly appreciated!

Last edited by MilesBFree on 19th Apr 2025 11:16pm. Edited 3 times in total

Here are the codes as in the image, to aid in people searching in the future:

PCM-Engine Petrol

P0302-00 (AC) Cylinder 2 misfire detected
P0304-00 (AC) Cylinder 4 misfire detected
P0308-00 (AC) Cylinder 8 misfire detected
P0300-00 (AC) Random misfire detected