A P0306 diagnostic trouble code on your 2024 Lexus GX indicates a misfire detected on cylinder 6. The completely redesigned 2024 GX550 features a new 3.4L twin-turbocharged V6 engine producing 349 horsepower, making this code completely valid for your vehicle.
The 2024 GX's New V6 Powertrain
The 2024 GX marks a major change from previous generations. The GX550 replaces the naturally aspirated 4.6L V8 with a modern 3.4L twin-turbo V6 (V35A-FTS) mated to a 10-speed automatic transmission. This engine is shared with the Tundra and Sequoia, featuring direct injection and advanced turbo technology.
Common Causes of P0306 in the GX550
- Ignition Coil Issues: Coil-on-plug failure on cylinder 6
- Spark Plug Problems: Worn or fouled spark plug
- Direct Injection Issues: Fuel injector failure or carbon buildup
- Turbo-Related Concerns: Boost leaks affecting cylinder 6
- Vacuum/Boost Leaks: Intake system air leaks
- Mechanical Issues: Low compression from valve or piston problems
Diagnostic Considerations
The twin-turbo V6 layout positions cylinder 6 at the rear of the passenger-side bank. The turbocharged nature of this engine means boost pressure and intercooler function should also be evaluated during diagnosis.