The 2023 Chevrolet Suburban features V8 power—the 5.3L (355 hp) or 6.2L (420 hp)—both equipped with Dynamic Fuel Management (DFM). When P0306: Cylinder 6 Misfire Detected appears, your Suburban has identified that cylinder 6 isn't contributing properly to engine output.
T1 Platform V8 Technology
The current-generation Suburban uses Dynamic Fuel Management (DFM), an advanced cylinder deactivation system that can shut down any combination of cylinders. Cylinder 6 may be deactivated during light-load driving for fuel savings. Proper lifter function is essential for DFM operation.
Why P0306 Occurs
DFM lifter issues can affect valve operation timing. Ignition coil degradation reduces spark quality. Spark plugs wear under V8 demands. Direct injection allows carbon accumulation. Fuel injector faults disrupt proper atomization.
Diagnostic Protocol
Scan for all codes including DFM system faults. Check for lifter tick or unusual valve train sounds. Inspect cylinder 6 ignition components. Remove and evaluate spark plug condition. Test fuel injector operation. Perform compression testing if mechanical concerns exist.
Maintaining Full-Size Capability
The Suburban's role as a family hauler and tower demands V8 reliability. Quality diagnosis and repair restores full capability for demanding duty.