A P0302 diagnostic code on your 2022 GMC Terrain indicates that cylinder 2 is experiencing combustion issues detected by the engine control module. The Terrain's turbocharged four-cylinder engine requires specific diagnostic attention.
2022 Terrain Engine Specifications
The 2022 GMC Terrain features a 1.5L turbocharged four-cylinder engine producing 170 horsepower. With only four cylinders, each one contributes 25% of the engine's power, making a cylinder 2 misfire immediately noticeable through rough running and reduced performance.
Turbocharged Engine Considerations
The turbocharger pressurizes intake air to increase power output. Boost leaks, wastegate malfunctions, or intercooler problems can affect the air-fuel ratio in individual cylinders. Cylinder 2 misfires may relate to boost pressure irregularities.
Direct Injection Analysis
The 1.5L engine uses direct fuel injection, delivering fuel at high pressure directly into the combustion chamber. Fuel injector issues, high-pressure fuel pump problems, or carbon buildup on intake valves can cause cylinder-specific misfires.
Ignition System Check
The coil-on-plug ignition system places an individual ignition coil on each spark plug. Cylinder 2's coil or spark plug may have failed, causing misfires. These components are relatively accessible on the four-cylinder engine.
Common Causes in This Engine
Known issues with this engine include ignition coil failures, carbon buildup on intake valves due to direct injection, and occasional turbocharger boost control problems. Age and mileage help determine the most likely cause.