The 2020 Toyota Tundra features the legendary 5.7L i-FORCE V8 engine producing 381 horsepower for full-size truck capability. When P0306: Cylinder 6 Misfire Detected triggers your check engine light, your Tundra's engine management has identified combustion problems in cylinder 6 of the 8-cylinder configuration.
V8 Engine Architecture
Toyota's 5.7L V8 (3UR-FE) uses a 90-degree V8 layout with cylinders numbered 1-4 on one bank and 5-8 on the other. Cylinder 6 sits on the right bank (passenger side) toward the rear of the engine. This proven powerplant uses port fuel injection for reliable, straightforward fuel delivery.
Common P0306 Causes
Ignition coil degradation from heat and age affects the individual coil-on-plug units. Spark plug wear—particularly important after 100,000 miles—reduces ignition efficiency. Fuel injector clogging or electrical faults prevent proper fuel atomization. Vacuum leaks specific to cylinder 6's intake runner create lean conditions. Less commonly, mechanical issues like worn valve seats affect compression.
Diagnostic Process
Scan for all diagnostic codes to identify patterns. The Tundra's engine bay provides good access to the V8's ignition components. Inspect cylinder 6's coil-on-plug unit for cracks, boot damage, or corrosion. Remove and evaluate the spark plug for wear patterns and proper gap. Test fuel injector pulse signal and flow rate. Perform compression testing to verify cylinder 6's mechanical integrity.
V8 Truck Service Considerations
The 5.7L i-FORCE V8 is known for durability. P0306 typically indicates serviceable maintenance items. Quality parts ensure continued reliable performance for demanding truck use.