When your 2020 Ford Edge displays the P0305 code, the powertrain control module has detected repeated misfires in cylinder 5. The 2020 Edge is available with the 2.0L EcoBoost four-cylinder or the 2.7L EcoBoost V6 (Edge ST). P0305 is valid only on the V6-equipped Edge ST model, as the four-cylinder has only cylinders 1-4.
Identifying Your Edge's Engine
The standard 2020 Edge uses a 2.0L EcoBoost turbocharged four-cylinder producing 250 horsepower. The performance-oriented Edge ST features a 2.7L EcoBoost twin-turbo V6 producing 335 horsepower. Check your trim level and engine specifications to confirm which powertrain is installed. P0305 is anomalous on four-cylinder models.
Cylinder 5 Location on Edge ST
The 2.7L EcoBoost V6 in the Edge ST places cylinder 5 on the passenger side bank toward the rear. This high-performance engine requires properly specified spark plugs and consistent maintenance to deliver optimal performance.
Common Causes on the 2.7L V6
Spark plug degradation can occur, especially under spirited driving that the ST model encourages. Ignition coil failure at cylinder 5 is possible. Direct injection engines are susceptible to carbon buildup on intake valves over time. The twin-turbo system requires proper boost delivery—any leaks can affect air-fuel ratios inconsistently.
Diagnostic Process
Confirm you have the Edge ST with V6 engine. Access cylinder 5's spark plug and inspect for wear, fouling, or damage. Test the ignition coil through resistance measurements and swap testing. Check for boost leaks in the turbo system. On higher-mileage examples, consider intake valve inspection for carbon deposits.