If your 2019 Hyundai Sonata is displaying a P0305 code indicating a cylinder 5 misfire, this code requires diagnostic investigation. The 2019 Sonata (final year of the seventh generation) offered only four-cylinder engines: the 2.4L naturally aspirated and 2.0L turbo. Neither has a cylinder 5, making P0305 technically anomalous.
2019 Sonata Engine Options
The 2019 Sonata offered the 2.4L Theta II I-4 (185 hp) and 2.0L Theta II Turbo I-4 (245 hp). The V6 option had been discontinued after the 2017 model year. Both available engines are four-cylinder configurations.
Why P0305 Is Anomalous
With exactly four cylinders on both available engines, a P0305 code cannot represent an actual cylinder 5 misfire. This indicates a diagnostic system error.
Possible Causes
A 2019 model may have battery degradation affecting ECM reliability. Scan tool communication errors may misread data. ECM software issues can store invalid codes. Aftermarket diagnostic tools may have compatibility issues.
Diagnostic Steps
Use a Hyundai-compatible scan tool to verify codes. Test battery condition—a 2019 vehicle may need battery evaluation. If actual misfire symptoms exist, diagnose cylinders 1-4. Clear the erroneous code and monitor.