The P0302 trouble code on your 2020 Mercedes-Benz GLC indicates that cylinder 2 is experiencing misfires detected by the engine control module. The X253 GLC300 uses the M264 2.0L turbocharged four-cylinder engine. At typical 2020 mileage, age-related factors may contribute to misfire conditions.
M264 Engine at Higher Mileage
The M264 2.0L turbo has accumulated meaningful mileage by 2020 standards. The direct-injection system may have developed carbon buildup on intake valves. Ignition components may be approaching replacement intervals. Comprehensive diagnosis should consider age-related factors.
Common Misfire Causes
By 2020 mileage, carbon buildup on intake valves may be significant. Ignition coil degradation from heat and age affects spark delivery. Spark plug wear reduces ignition energy. High-pressure fuel system wear can affect delivery. Vacuum leaks from aged hoses and seals develop over time.
Age-Related Considerations
The 2020 model year is approaching higher mileage where GDI maintenance becomes important. Carbon cleaning, ignition component replacement, and vacuum system inspection should be part of comprehensive diagnosis.
Symptom Recognition
The compact SUV displays rough idle, vibration, and hesitation with misfires. Four-cylinder engines show pronounced symptoms. Check engine light accompanies the condition.
Repair Solutions
Replace spark plugs with Mercedes-Benz specified units. Replace ignition coils as needed. Clean intake valve carbon. Service fuel system components. Address vacuum leaks discovered during diagnosis.