If your 2024 Subaru Forester is displaying a P0305 code indicating a cylinder 5 misfire, this code requires diagnostic investigation. The 2024 Forester uses a 2.5L naturally aspirated flat-four engine as its sole powertrain. With only four cylinders numbered 1-4, P0305 is technically anomalous.
2024 Forester Powertrain
The sixth-generation 2024 Forester uses the 2.5L FB25 flat-four producing 182 horsepower. This is the only engine available across all Forester trims. Subaru has never offered a six-cylinder engine in the Forester lineup.
Why P0305 Cannot Be Valid
The Forester's 2.5L flat-four has 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 Subaru systems.
Diagnostic Recommendations
Use a Subaru SSM or compatible scan tool to verify codes. Test battery condition. If actual misfire symptoms exist, focus on cylinders 1-4. Clear the erroneous code and monitor.