Diagnostic trouble code P0306 on your 2022 GMC Sierra indicates misfires in cylinder 6. The 2022 Sierra offers multiple engine options with six or more cylinders, making P0306 a valid code requiring systematic diagnosis.
2022 Sierra Engine Configuration
The 2022 Sierra offered the 3.0L Duramax diesel inline-6, 4.3L V6, 5.3L V8, and 6.2L V8. All have six or more cylinders capable of triggering legitimate P0306 codes. The 2.7L turbo-4 would show anomalous P0306.
DFM/AFM Considerations
V8 engines feature Dynamic Fuel Management (DFM) or Active Fuel Management (AFM) cylinder deactivation. These systems can cause misfire symptoms when lifters or solenoids malfunction.
Common Causes
Ignition coil degradation, spark plug wear, DFM lifter problems, and fuel injector issues are typical at this age.