The 2024 Volvo XC90 continues with turbocharged 4-cylinder engines exclusively, including mild-hybrid and plug-in hybrid variants. A P0305 diagnostic trouble code indicating cylinder 5 misfire presents a diagnostic puzzle since this flagship SUV only contains a four-cylinder engine.
The P0305 Code Contradiction
Standard OBD-II code P0305 indicates "Cylinder 5 Misfire Detected," but the XC90's 2.0-liter engine has cylinders numbered only 1 through 4. This code appearing suggests a diagnostic system anomaly requiring investigation.
Volvo's Powertrain Philosophy
Volvo committed to 4-cylinder engines for their entire lineup, using electrification to enhance performance. The XC90's B5, B6, and Recharge powertrains all use the same 4-cylinder base engine with varying levels of electric assistance. None include a fifth cylinder.
Investigating the Anomalous Code
Proper diagnosis requires Volvo VIDA diagnostics to analyze actual misfire counter data for each of the four physical cylinders. Software updates should be checked.
Warranty Coverage
As a 2024 model, software-related diagnostic issues should be addressed under Volvo warranty.