P0302 Chevrolet Colorado
Cylinder 2 Misfire Detected · Powertrain Code · High · Repair: Moderate
What is P0302?
Misfire detected in cylinder 2. Typically caused by a worn spark plug, bad ignition coil, faulty fuel injector, or low compression in that cylinder.
When the Chevrolet Colorado triggers code P0302 (cylinder 2 misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Chevrolet Colorado.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Chevrolet Colorado.
Common Causes on Chevrolet Colorado
- Failed or worn spark plug on cylinder 2
- Bad ignition coil on cylinder 2 (coil-on-plug design on all modern GM engines)
- AFM/DFM lifter failure on cylinder 2 (5.3L and 6.2L V8s)
- Fuel injector failure or clogging on cylinder 2
- Low compression from burned valve or head gasket leak (1.5T known issue)
Symptoms
- Check Engine Light on (flashing if severe)
- Rough idle with noticeable vibration
- Loss of power
- Misfiring felt during acceleration
- Possible fuel smell from unburned fuel
Notes for Chevrolet Colorado
On GM V8s with AFM/DFM, single-cylinder misfires on cylinders 1, 4, 6, or 7 (AFM cylinders) strongly suggest lifter failure — cylinder 2 is less commonly an AFM lifter issue.