A P0302 diagnostic trouble code on your 2022 GMC Acadia indicates that cylinder 2 is misfiring beyond the engine control module's acceptable threshold. The Acadia offers two engine options requiring different diagnostic approaches.
2022 Acadia Engine Options
The 2022 GMC Acadia came with either a 2.0L turbocharged four-cylinder or a 3.6L V6 engine. Both engines use direct fuel injection and coil-on-plug ignition, but their characteristics differ significantly.
2.0L Turbo Four-Cylinder
With only four cylinders, each cylinder contributes 25% of the engine's power. A cylinder 2 misfire is immediately noticeable as rough idle and reduced acceleration. Check boost pressure, direct injection system operation, and ignition components.
3.6L V6 Engine Analysis
GM's 3.6L V6 is a mature design with known characteristics. Carbon buildup on intake valves is a documented concern with direct injection engines of this age. Cylinder 2 is located on the rear bank, making access slightly more challenging.
Direct Injection Considerations
Both engines use high-pressure direct fuel injection. Injector issues can cause cylinder-specific misfires. Carbon buildup on the intake valves—a common DI side effect—affects airflow and can contribute to misfires. Inspect for buildup if the vehicle has accumulated significant mileage.
Diagnostic Approach
Start with basic ignition checks: spark plug condition and ignition coil function. Progress to fuel system analysis including injector operation and fuel pressure. Finally, assess mechanical condition through compression testing.