2005 Mitsubishi P0305: What It Means & Is It Safe to Drive?
P0305 on the 2005 Mitsubishi: Cylinder 5 Misfire Detected. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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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 on the 2005 Mitsubishi
- 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 2005 Mitsubishi, repairs for P0305 typically fall between $150 and $1000, depending on the root cause and labor rates in your area.
Known issues on Mitsubishi
Mitsubishi V6 P0305 on cylinder 5 (rear bank) follows the same diagnosis as P0303. On the 6G75 3.8L, rear-bank COP coil failures are slightly more common than front-bank due to heat proximity to the firewall. Confirm with a coil swap.
Most commonly affected models
Outlander 3.0L 6G72 2004–2006Endeavor 3.8L 6G75 2004–2011Eclipse 3.8L 6G75 2006–2012