The 2022 Buick Envision compact SUV is powered exclusively by a 2.0-liter turbocharged 4-cylinder engine producing 228 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 Envision's turbocharged 4-cylinder contains only cylinders numbered 1 through 4. The appearance of this code indicates a diagnostic system irregularity.
Envision Engine History
The current second-generation Envision (2021+) offers only the 2.0L turbo-4. The previous generation also primarily used 4-cylinder engines. No Envision has ever offered a 6-cylinder option where cylinder 5 would exist.
Diagnostic Protocol
When encountering P0305 on your 4-cylinder Envision, a qualified technician should use GM diagnostic equipment 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.