2021 Chevrolet P0301: What It Means & Is It Safe to Drive?
P0301 on the 2021 Chevrolet: Cylinder 1 Misfire Detected. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
PowertrainHigh urgency
What this code means
The PCM has detected a misfire specifically on cylinder 1. Similar to P0300, but pinned to a single cylinder.
Common causes on the 2021 Chevrolet
- Worn or fouled spark plug on cylinder 1
- Failing ignition coil or coil-on-plug
- Leaking or clogged fuel injector
- Low compression in cylinder 1
Symptoms
- Check Engine Light (often flashing when misfire is severe)
- Rough idle or shaking, especially at low RPM
- Loss of power under load
Typical fixes
- Replace spark plug and/or coil on cylinder 1
- Test and clean or replace the injector
- Perform compression test and repair internal issues if needed
Repair cost range
For a 2021 Chevrolet, repairs for P0301 typically fall between $150 and $900, depending on the root cause and labor rates in your area.
Known issues on Chevrolet
GM's 5.3L AFM V8 can develop P0301 from a collapsing AFM lifter on cylinder 1. If the misfire is accompanied by a slight knock or oil consumption, suspect the lifter before blaming the ignition system. On 3.5L and 3.9L V6 engines, intake manifold gasket leaks are a common misfire trigger.
Most commonly affected models
Silverado 5.3L AFM 2007–2014Impala 3.5L 2006–2013Colorado 2.8L 2004–2012