When your 2022 Chevrolet Colorado displays a P0302 code, the engine control module is reporting a misfire condition in cylinder 2. This second-generation Colorado, in its final year before the 2023 redesign, continues with the 2.5L I-4, 3.6L V6, and 2.8L Duramax diesel engine options. Each powerplant has distinct characteristics affecting misfire diagnosis.
Engine Options and Cylinder Configuration
The 2.5L inline-4 positions cylinder 2 second from front, easily accessible for service. The 3.6L V6 places cylinder 2 on the rear bank against the firewall, requiring more effort to reach. The 2.8L Duramax diesel is an inline-4 with cylinder 2 in the same position as the 2.5L gasoline engine.
Gasoline Engine Misfire Sources
Both the 2.5L and 3.6L engines use direct fuel injection, making them susceptible to carbon buildup on intake valves. Ignition system components—spark plugs and coils—degrade over time and mileage. Fuel injector clogging or electrical failure can also cause cylinder-specific misfires. The 3.6L has documented timing chain stretch issues that can affect valve timing.
Duramax Diesel Considerations
The 2.8L Duramax triggers P0302 when cylinder 2 fails to produce expected power. Since diesels lack spark plugs, causes include fuel injector failure, low fuel rail pressure, compression loss, or glow plug problems affecting cold combustion. Injector balance rates indicate individual cylinder fuel delivery performance.
Diagnostic Methodology
Begin with comprehensive code scanning including freeze frame analysis. For gasoline engines, inspect ignition components, test fuel injectors, and evaluate intake valve condition with a borescope. For the Duramax, monitor injector balance rates, test fuel pressure, and verify compression. Compare cylinder 2 performance to other cylinders.
Repair Solutions
Gasoline engine repairs typically start with spark plugs and ignition coils. Fuel injector cleaning or replacement addresses delivery issues. Walnut blasting cleans carbon from intake valves on direct-injection engines. Duramax repairs may require injector replacement with proper ECM coding. Compression issues indicate head gasket or internal engine problems.