What does code P0305 mean on a Acura and is it safe to drive?
P0305: Cylinder 5 Misfire Detected. Here's what it means on your Acura, 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 Acura
- 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 Acura, 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 Acura
Acura J-series V6 P0305 on rear-bank cylinder 5 requires intake manifold removal. Confirm the coil is faulty with a swap test to the front bank first. On the RL's J37A1, SH-AWD torque vectoring adds no additional complexity to the misfire diagnosis.
Most commonly affected models