Jeep has 68000miles with the 3.7l v6. It has a rough idle, and throws the code right after starting the jeep. Doesn't have trouble starting and it doesn't feel like it is missing while driving, just at idle. Parameter Description. Results. DTC for which Freeze Frame was Stored. P0300. Fuel System 1 Status. Closed Loop. Jeep Grand Cherokee & Commander Forums. P0300, and P0301-P0306 misfire codes. 7827 Views 5 Replies 4 Participants Last post by jfl564, Dec 6, 2009 Jump to Latest J. Ram Year. 2004. Engine. Hemi 5.7. I just got this P0300 code 2 days ago (the first time was 3 months ago and they said I needed new plugs so I got it done and CEL disapeared until 3 days ago). Today on a cold start she runs OK for 2-3 minutes and then wham! it runs like crap. 3 days ago it started running very bad while I was 50 miles from home It’s generic code, which means that it means the same thing for the Jeep Grand Cherokee as it would for any other vehicle. When the PCM sees voltage at cylinder 2 that is out of the normal operating range, it’ll trigger this code. P0202 is usually caused by a bad fuel injector or wiring issue. If the misfire were in cylinder 1, you’d get

The codes it pulled from that were P0300 multiple misfire and P0152 Bank 2 position 1 O2 sensor high voltage. I added some displays to the Torque app to look at my O2 voltages and found this - O2 bank 2 position 2 is at 0.0V and bank 1 is at 1.3V. The bank 1 sensors are right at 0.85 ish volts.

The code appeared again on Dec 26 2012 (mileage 11468) They replaced the cam-phasers on Jan 22, 2013. The code showed up again on March 16, 2013 (mileage 12997). The code disappeared on March 19, 2013 (I drove 3 miles per day in these 2 days, from home to oceanside train stations). I left my car at the dealer and they are inspecting it today.
5366 posts · Joined 2010. #1 · Dec 28, 2012. P0300, P0355 & P0339 with stumbling? I'm getting codes P0300, P0335 and P0339. I had to try and start the vehicle two or three times, and it won't rev passed 2500rpm or so (somewhere around there). It just stumbles or rev-limits and won't let it pass that RPM, in neutral or in gear, or in gear with
My wife's 2006 throws the P0300 code occasionally in winter. While warming up. Jeep Grand Cherokee & Commander Forums. WK Grand Cherokee & XK Commander Forum

I'm getting a rough idle accompanied with a P0300 code. Jeep drives fine but obviously want to resolve the issue and not risk long term damage. My rig: 2021 Trackhawk, ordered June of '21 and took delivery in September. Currently at 5,478 miles.

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