When your 2024 GMC Sierra displays diagnostic trouble code P0306, the engine control module has detected misfires in cylinder 6. The 2024 Sierra offers V6 and V8 engine options, all with six or more cylinders, making P0306 a valid diagnostic code requiring systematic troubleshooting.
2024 Sierra Engine Options
The 2024 GMC Sierra offers the 3.0-liter Duramax turbo-diesel inline-6, the 2.7-liter turbo-4 (anomalous for P0306), the 4.3-liter V6, the 5.3-liter V8, and the 6.2-liter V8. All except the turbo-4 have six or more cylinders making P0306 valid.
Dynamic Fuel Management Considerations
Sierra V8 engines feature Dynamic Fuel Management (DFM) that can deactivate cylinders including #6. DFM lifter or solenoid issues can cause misfires during cylinder deactivation transitions.
Common Causes
Ignition coil failure, spark plug wear, DFM lifter problems, and fuel injector issues are typical causes across Sierra engine options.