The 2024 Lexus GX introduces an all-new generation featuring the 3.4-liter twin-turbocharged V6 engine (V35A-FTS) producing 349 horsepower. This six-cylinder engine includes cylinder 5 as a legitimate position. A P0305 diagnostic trouble code indicates the engine management system has detected a misfire at this cylinder.
Understanding P0305 on New GX
The P0305 code signifies "Cylinder 5 Misfire Detected." The twin-turbo V6 replaces the previous generation's naturally aspirated V8. Cylinder 5 is positioned on one bank of this compact V6 configuration.
New Engine Platform
The V35A-FTS engine is shared with the new Tundra, Sequoia, and Land Cruiser. This twin-turbo V6 delivers V8-like performance with improved efficiency. Being a new powerplant, early production vehicles may receive calibration updates.
Common Misfire Causes
Cylinder 5 misfires on the twin-turbo V6 can result from ignition coil failure, spark plug issues (which experience higher stress under boost), fuel injector malfunction, or in turbocharged applications, boost-related fueling concerns.
Warranty Coverage
As a 2024 model, your GX should be under full warranty. Manufacturing defects or premature component failures should be addressed by Lexus dealers at no cost.