2014 Jeep Grand Cherokee - P0302 Cylinder 2 Misfire - Persistent

Question

I have a 2014 Grand Cherokee with the Pentastar. It has a constant P0302 misfire that won't go away. I've swapped coils and plugs, and even replaced the fuel injector on cylinder 2.

There is a very distinct 'ticking' sound coming from the left-side (driver side) valve cover. It gets faster with engine RPM. Compression test showed 120psi on cylinder 2 while others were at 145psi. I'm worried the cylinder head is toast.

WesternStarWill · Answer

Check the wiring harness where it crosses over the back of the engine. There is a common rub point against the heat shield that can ground out injector wires. However, that wouldn't explain your lower compression reading.

HondaHankk · Answer

✅ Confirmed fix: This is the classic Pentastar 'Left Head' failure. The rocker arms have needle bearings that fail, which then eats the camshaft lobe. In my case, the intake rocker on cylinder 2 had collapsed, and the cam lobe was worn down significantly, preventing the valve from opening fully. Replaced all rockers, lifters, and the camshaft on that bank. Problem solved.

2014 Jeep Grand Cherokee - P0302 Cylinder 2 Misfire - Persistent

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