When your 2024 Mazda CX-90 displays diagnostic trouble code P0306, the engine control module has detected misfires in cylinder 6. If your CX-90 is equipped with the new 3.3-liter turbocharged inline-6 engine, this is a valid diagnostic code requiring systematic troubleshooting.
2024 CX-90 Engine Options
The 2024 Mazda CX-90 offers the groundbreaking Skyactiv-G 3.3-liter turbocharged inline-6 engine producing 340 horsepower, as well as a 2.5-liter four-cylinder plug-in hybrid option. P0306 is only valid on the inline-6 models since the PHEV uses a four-cylinder.
Skyactiv-G 3.3T Inline-6
Mazda's new inline-6 turbo represents a major powertrain expansion. Cylinder 6 is positioned at the rear of the engine closest to the firewall. This longitudinally-mounted engine marks Mazda's return to six-cylinder power after years of four-cylinder-only offerings.
Common P0306 Causes
As a new engine, ignition coil or spark plug defects from manufacturing are considerations alongside typical misfire causes. Carbon buildup is unlikely on new engines. Fuel injector issues and turbo system problems can also cause cylinder 6 misfires.