2008 Chevrolet P0305: What It Means & Is It Safe to Drive?
P0305 on the 2008 Chevrolet: 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 2008 Chevrolet
- 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 2008 Chevrolet, repairs for P0305 typically fall between $150 and $1000, depending on the root cause and labor rates in your area.
Known issues on Chevrolet
On the 5.3L AFM V8, cylinder 5 is one of the four AFM deactivation cylinders. P0305 on high-mileage trucks should prompt an oil consumption check and AFM lifter inspection before replacing the coil or plug. An AFM delete kit prevents recurrence.
Most commonly affected models
Silverado 5.3L V8 2007–2014Suburban 5.3L 2007–2014Camaro V6 3.6L 2010–2015