What does code P0305 mean on a Volvo and is it safe to drive?
P0305: Cylinder 5 Misfire Detected. Here's what it means on your Volvo, 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 Volvo
- 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 Volvo, 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 Volvo
Volvo B6294T inline-six P0305 is a standard COP failure or worn spark plug. On the T6 3.2L, cylinder 5 is toward the firewall—access is straightforward from above. Swap the COP to cylinder 1 and rescan to confirm the fault before replacing.
Most commonly affected models