2010 Chevrolet P0303: What It Means & Is It Safe to Drive?
P0303 on the 2010 Chevrolet: Cylinder 3 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
The PCM has detected a misfire specifically on cylinder 3. Diagnosis follows the same steps as P0301—swap parts to the same position on a known-good cylinder to isolate the fault.
Common causes on the 2010 Chevrolet
- Worn or fouled spark plug on cylinder 3
- Failing ignition coil on cylinder 3
- Leaking or clogged fuel injector
- Low compression on cylinder 3
Symptoms
- Check Engine Light, often flashing under load
- Rough idle or shaking
- Loss of power, hesitation
Typical fixes
- Replace spark plug and coil on cylinder 3
- Test and replace fuel injector
- Compression test if ignition parts don't resolve it
Repair cost range
For a 2010 Chevrolet, repairs for P0303 typically fall between $150 and $900, depending on the root cause and labor rates in your area.
Known issues on Chevrolet
On GM's 5.3L AFM V8, cylinder 3 is an active cylinder so P0303 typically indicates a coil or plug failure rather than a lifter issue. On 3.5L V6 Impala and Malibu, check for intake manifold gasket failure at the cylinder 3 port first.
Most commonly affected models
Silverado 5.3L 2007–2014Tahoe 5.3L 2007–2014Impala 3.5L 2006–2013