When your 2020 Mercedes-Benz GLE displays diagnostic trouble code P0306, the engine control module has detected misfires in cylinder 6. The 2020 GLE offers inline-6 and V8 engine options, making P0306 a valid code on most variants requiring systematic diagnosis.
2020 GLE Powertrain Options
The 2020 GLE introduced the W167 platform with the M256 3.0-liter turbocharged inline-6 with mild hybrid in GLE450, and twin-turbo V8 options in higher trims. All six-cylinder and V8 variants can legitimately trigger P0306.
Age and Mileage Factors
At 2020 model age, wear-related issues become more relevant. Spark plugs may be approaching service intervals, ignition coils may have degraded, and carbon buildup from direct injection can affect cylinder 6.
Diagnostic Approach
Identify engine type and locate cylinder 6 accordingly. Standard ignition, fuel, and compression diagnostics apply with consideration for higher mileage wear patterns.