When your 2022 Buick Encore GX triggers the P0303 code, the engine control module has identified consistent misfires in cylinder 3. The compact SUV uses GM's small turbocharged three-cylinder engines.
Encore GX Engine Options
The 2022 Encore GX offers a 1.2L turbocharged three-cylinder (137 hp) or 1.3L turbocharged three-cylinder (155 hp). On three-cylinder engines, cylinder 3 is the rearmost cylinder. These small turbos require specific diagnostic approaches.
Common Causes
- Ignition Coil Failure: Three-cylinder engines have higher individual cylinder loads
- Spark Plug Issues: Turbo applications require specific plugs
- Boost System Leaks: Small turbos sensitive to intake leaks
- Fuel Injector Problems: Direct injection deposits or failures
- Carbon Buildup: GDI technology leads to valve deposits
Diagnostic Approach
Use a GM-compatible scanner for detailed diagnostics. Monitor boost pressure and misfire counts. Test ignition components through swap testing. Check for vacuum and boost leaks.
Repair Solutions
Replace failed ignition coils with AC Delco components. Install properly specified spark plugs. Repair boost system leaks. Address carbon buildup through professional cleaning.