The P0302 trouble code on your 2020 Hyundai Tucson indicates that cylinder 2 is experiencing misfires detected by the engine control module. The third-generation Tucson offers two engine options: the 2.0L Nu four-cylinder producing 161 horsepower or the 2.4L Theta II four-cylinder producing 181 horsepower. Both are naturally aspirated with multi-port fuel injection.
Engine Configuration
Both Tucson engines are inline-4 designs with cylinder 2 positioned second from the timing chain end. The 2.0L and 2.4L share similar architecture with dual overhead cams and multi-port injection. This traditional design means carbon buildup is less of a concern compared to direct-injection engines.
Common Misfire Causes
Ignition coil failure is a primary cause of cylinder-specific misfires on both engines. Spark plug wear over time reduces ignition efficiency. Fuel injector clogging affects fuel delivery to cylinder 2. Vacuum leaks near the intake manifold create lean conditions. Both engines are generally reliable but can develop issues with age and mileage.
Symptom Identification
Four-cylinder engines display pronounced misfire symptoms. The Tucson will exhibit rough idle, vibration, and hesitation during acceleration. Fuel economy decreases and power feels reduced. The check engine light illuminates when misfires are detected.
Diagnostic Approach
Scan for all codes and freeze frame data. Inspect spark plug on cylinder 2 for wear or fouling. Test ignition coil functionality. Check fuel injector operation using noid light and balance test. Verify no vacuum leaks exist. Compression testing confirms cylinder mechanical integrity.
Repair Solutions
Replace spark plugs with NGK or Denso iridium units at recommended intervals. Replace faulty ignition coils. Clean or replace clogged fuel injectors. Repair vacuum leaks using appropriate gaskets and materials. Both engines respond well to standard maintenance practices.