The P0302 diagnostic code on your 2020 Chevrolet Traverse signals that cylinder 2 is experiencing misfires detected by the engine control module. This mid-size crossover is powered by the 3.6L V6 LFY engine, a naturally aspirated direct-injection powerplant producing 310 horsepower. Understanding the specific characteristics of this engine helps target the misfire cause effectively.
Cylinder 2 Location and Function
On GM's 3.6L V6, cylinder 2 is located on the rear bank (closer to the firewall), making access somewhat challenging compared to front-bank cylinders. The firing order is 1-2-3-4-5-6, with cylinders 2, 4, and 6 on the rear bank. The direct injection system delivers fuel at extremely high pressure directly into the combustion chamber.
Common Causes in the 3.6L V6
Carbon buildup on intake valves is a well-documented issue with direct-injection engines like the 3.6L V6. Without fuel washing over the valves (as in port injection), carbon deposits accumulate and can cause misfires. Other causes include spark plug degradation, ignition coil failure, fuel injector problems, and timing chain wear affecting valve timing.
Symptoms of Cylinder 2 Misfire
You may notice rough idle, hesitation during acceleration, reduced fuel economy, and a rhythmic vibration from the engine. The check engine light will illuminate, and if misfires are severe, the light may flash indicating potential catalytic converter damage. Some owners report symptoms worsen during cold starts.
Diagnosis Process
Begin by scanning for codes and noting freeze frame data. Inspect the spark plug and ignition coil on cylinder 2 (rear bank access required). Direct injection fuel pressure testing ensures adequate fuel delivery. A borescope inspection can reveal carbon buildup on cylinder 2 intake valves. Compression testing rules out mechanical issues.
Effective Repairs
Start with spark plug replacement using AC Delco 41-103 or equivalent iridium plugs. Replace the ignition coil if signs of failure are present. For carbon buildup, walnut shell blasting or chemical cleaning of intake valves restores proper airflow. Fuel injector cleaning or replacement addresses fuel delivery problems. Timing chain inspection is warranted on higher-mileage vehicles.