If your 2020 Hyundai Santa Fe is displaying a P0305 code indicating a cylinder 5 misfire, this code requires diagnostic investigation. The 2020 Santa Fe offered only four-cylinder engines: the 2.4L naturally aspirated and 2.0L turbo. Neither configuration has a cylinder 5, making P0305 technically anomalous.
2020 Santa Fe Powertrain
The fourth-generation 2020 Santa Fe offered the 2.4L Theta II I-4 (185 hp) and 2.0L Theta II Turbo I-4 (235 hp). Both are four-cylinder engines with cylinders numbered 1-4. The V6 option from previous generations was not offered on the fourth-generation Santa Fe.
Why P0305 Cannot Be Valid
All 2020 Santa Fe engines have exactly four cylinders. A P0305 code references a non-existent cylinder 5, indicating a diagnostic error rather than an actual misfire.
Possible Causes
ECM software issues can store invalid codes. Scan tool communication errors may misread data. Low 12-volt battery voltage affects computer reliability. Aftermarket diagnostic tools may have compatibility issues with Hyundai systems.
Diagnostic Recommendations
Use a Hyundai GDS or compatible scan tool to verify codes. Test battery condition. If actual misfire symptoms exist (rough running, hesitation), focus on cylinders 1-4. Clear the erroneous code and monitor for recurrence.