Diagnostic trouble code P0306 on your 2023 GMC Yukon indicates misfires in cylinder 6. The 2023 Yukon uses V8 engines exclusively, making P0306 a valid code requiring systematic diagnosis.
2023 Yukon Engine Options
The 2023 GMC Yukon offers the 5.3L V8 (355 hp) and 6.2L V8 (420 hp). Both feature Dynamic Fuel Management (DFM) cylinder deactivation with cylinder 6 included in deactivation patterns.
DFM Diagnostics
V8 engines with DFM can experience misfires from lifter or solenoid issues during cylinder deactivation. These symptoms may occur during mode transitions rather than steady-state operation.
Common Causes
Ignition coil degradation, spark plug wear, DFM system issues, and fuel injector problems are typical causes.