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The CEL in my 2020 Grand Cherokee - 3.6L, with 85, # # # miles on it started coming on and off at the end of January. There was a P0305 code stored at that time - misfire #5 cylinder.

I replaced the #5 coil pack thinking that maybe it was a bad coil pack. No CEL for two weeks, and then it came back. Thinking that maybe I got a bad coil pack from the parts store, I moved the new coil pack from #5 to #2 and replaced all 6 plugs, with no issues for another week. I also noticed when I replaced the plugs that the coolant was low? I topped it off and decided I would find the leak another day.

CEL came back and the Jeep was running rough. The CEL then went out again. A little stumped, I took it to a shop on the recommendation of someone that I trust. The shop called me the next day and said that the coolant was low, however after topping it off and pressure-checking it, found no leaks.

This shop believes that the Jeep needs new cylinder heads! And I am inclined to believe them. It's been two days and the coolant is low again, and I am getting white smoke from the exhaust.

Has anyone else run into this with the 3.6L before? The oil is clean, with NO signs of intermix.

I just turned in my 2014 JK with the 3.6L and aside from a couple of oil coolers, never had an engine issue in 172K miles on it.

Out with the old, and in with the new-er. Picked up a Gladiator the other night.

AWESOME to have had the opportunity to meet Dan Grec again at !!!

Dan is one of the nicest people in the world, willing to provide advice to anyone that wants to get the most out of their overland adventures!!!

Go to to learn how you can support Dan!!!

Just got my Windrock Offroad Park Jeep Badge of Honors Trail 51 Panther Rock badge!

Southern Nights Jeep Club

More Spring cleaning…