The P0302 diagnostic code on your 2020 Hyundai Santa Fe indicates that cylinder 2 is experiencing misfires detected by the engine control module. The fourth-generation Santa Fe offers two engine choices: the 2.4L GDI four-cylinder producing 185 horsepower or the 2.0L turbocharged four-cylinder producing 235 horsepower. Both engines use direct fuel injection.
Engine Options and Cylinder Configuration
Both Santa Fe engines are inline-4 designs with cylinder 2 positioned second from the timing chain end. The 2.4L GDI and 2.0L turbo GDI both use high-pressure direct injection, making them susceptible to carbon buildup on intake valves. The turbo adds boost pressure complexity to the diagnostic process.
Common Misfire Causes
Direct injection carbon buildup is a documented concern on both GDI engines. Ignition coil failure affects spark delivery to cylinder 2. Spark plug wear reduces ignition energy. Fuel injector issues including clogging and electrical problems affect fuel delivery. The 2.0L turbo adds potential boost system causes.
Symptom Identification
Four-cylinder engines display noticeable misfire symptoms. The crossover exhibits rough idle, vibration, and hesitation during acceleration. The refined driving character suffers when cylinder 2 doesn't contribute properly. Check engine light illumination accompanies detected misfires.
Diagnostic Approach
Identify which engine your Santa Fe has. Scan for all codes including boost codes on turbo models. Inspect ignition components on cylinder 2. Borescope inspect intake valves for carbon buildup. Test fuel injector operation and fuel pressure. Turbo models require boost system evaluation. Compression testing confirms mechanical integrity.
Repair Solutions
Replace spark plugs and ignition coils as needed. Address carbon buildup through walnut blasting or chemical cleaning. Service fuel injectors if testing indicates problems. Turbo system issues require boost pressure and wastegate evaluation. Both engines respond well to proper maintenance.