The P0304 diagnostic code indicates your 2020 Chevrolet Traverse has detected consistent misfires in cylinder 4. This three-row crossover's 3.6L V6 engine requires understanding of V6 cylinder configuration and common failure patterns to effectively diagnose and repair this combustion problem.
Understanding P0304 in the 2020 Traverse
The 2020 Traverse features GM's 3.6L V6 engine producing 310 horsepower through variable valve timing and direct fuel injection. This transverse-mounted V6 places cylinder 4 on the rear bank, toward the passenger side of the engine. GM's V6 numbering convention positions cylinders 2, 4, and 6 on the rear bank with 1, 3, and 5 on the front bank.
Common Misfire Causes in the 3.6L V6
The direct injection 3.6L faces typical DI challenges including carbon buildup on intake valves over time. Spark plugs in this high-output V6 experience significant wear under normal operation. Ignition coils must generate sufficient voltage for reliable combustion. The rear cylinder bank's location can make temperature management and component accessibility more challenging.
Diagnostic Approach
Retrieve all stored codes and analyze freeze frame data. Access the rear bank where cylinder 4 resides—the transverse mounting positions this area toward the firewall, requiring careful navigation. Inspect spark plug and ignition coil condition. Test fuel injector operation. Consider carbon buildup as a contributing factor for vehicles with higher mileage.
Repair Solutions
Replace spark plugs with GM-specified components designed for the 3.6L application. Test and replace ignition coils showing degraded output. Address fuel injector restrictions through cleaning or replacement. Carbon accumulation requires professional intake valve cleaning for effective removal.