The 2024 Mazda CX-90 introduces Mazda's new Skyactiv-G 3.3-liter turbocharged inline-6 engine, marking the brand's return to six-cylinder power. This flagship SUV produces 340 horsepower and 369 lb-ft of torque. A P0305 diagnostic trouble code indicates the engine management system has detected a misfire condition specifically at cylinder 5 of this inline-six configuration.
Understanding P0305 on the CX-90 Inline-6
The P0305 code signifies "Cylinder 5 Misfire Detected," and on the Skyactiv-G inline-6 engine, cylinder 5 is a legitimate cylinder position. Located fifth from the front of the engine, cylinder 5 fires as part of the optimized firing order designed for smooth power delivery in this new powerplant.
Common Cylinder 5 Misfire Causes
The new Skyactiv-G 3.3T engine still experiences common misfire causes despite its advanced design. Cylinder 5 misfires typically result from ignition coil degradation, spark plug wear, fuel injector issues, intake valve carbon deposits from direct injection, or mechanical issues affecting compression.
CX-90 Engine Technology
The Skyactiv-G inline-6 features Mazda's latest technology including M Hybrid Boost mild-hybrid assistance, advanced combustion chamber design, and sophisticated engine management. The inline-6 configuration provides inherent balance and smooth operation.
Professional Diagnosis Requirements
Accurate P0305 diagnosis requires Mazda IDS diagnostic equipment for detailed misfire counter analysis, freeze frame data interpretation, and cylinder-specific testing. Component testing should focus on cylinder 5 ignition, fuel delivery, and mechanical integrity.