The 2022 Acura Integra returned to the lineup powered exclusively by a 1.5-liter turbocharged 4-cylinder engine (L15CA) producing 200 horsepower. When a P0305 diagnostic trouble code appears indicating a cylinder 5 misfire, this represents an anomalous diagnostic situation requiring specialized investigation.
Understanding the P0305 Anomaly
The P0305 code translates to "Cylinder 5 Misfire Detected" in standard OBD-II terminology. However, the Integra's turbocharged 4-cylinder engine contains only cylinders numbered 1 through 4. The appearance of this code indicates a diagnostic system irregularity.
Integra Heritage vs Modern Reality
Classic Integra models were also 4-cylinder, so P0305 has never been a valid code on any Integra generation. The modern Integra's turbo-4 shares architecture with Honda Civic Si, both featuring four cylinders exclusively.
Diagnostic Protocol
When encountering P0305 on your 4-cylinder Integra, a qualified technician should use Honda/Acura HDS diagnostics to verify actual misfire counter data for cylinders 1-4. Software updates and communication errors should be investigated.
Possible Causes
This anomalous code may result from ECU software requiring updates, control module communication errors, or aftermarket device interference.