What does code P0305 mean on a Jeep and is it safe to drive?
P0305: Cylinder 5 Misfire Detected. Here's what it means on your Jeep, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
Misfire on cylinder 5—present on V6, V8, and inline-5 engines only. On V6 engines, cylinder 5 is sometimes harder to access; factor labor into repair estimates.
Common causes for your Jeep
- Fouled spark plug
- Failed ignition coil
- Leaking or clogged injector
- Low compression from valve or ring wear
Symptoms
- Check Engine Light
- Engine shaking or rough idle
- Power loss under acceleration
Typical fixes
- Replace spark plug and coil on cylinder 5
- Test and replace injector if needed
- Compression and leak-down test
Repair cost range
For a Jeep, repairs for P0305 often fall between $150 and $1000, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Jeep
HEMI-equipped Jeep P0305 can indicate an MDS solenoid fault or collapsed lifter on cylinder 5, which is a deactivation cylinder on the 5.7L. On the 3.6L Pentastar, P0305 is a rear-bank fault—standard cam follower and coil diagnostics apply.
Most commonly affected models