When your 2024 Ford Explorer displays the P0305 code, the powertrain control module has detected repeated misfires in cylinder 5. The 2024 Explorer offers both four-cylinder and V6 engine options. If your Explorer has the 3.0L EcoBoost V6 or the 3.3L V6 hybrid, cylinder 5 exists and this code represents a legitimate misfire. However, if you have the 2.3L EcoBoost four-cylinder, P0305 would be anomalous.
Identifying Your Explorer's Engine
The 2024 Explorer offers the 2.3L EcoBoost I-4 (300 hp), 3.0L EcoBoost V6 (400 hp in ST trim), and 3.3L V6 hybrid. Check your window sticker, door jamb label, or emissions sticker to confirm which engine is installed. Cylinder 5 only exists on V6 configurations.
Cylinder 5 Location on Explorer V6
On Ford's longitudinally-mounted V6 engines in the Explorer, cylinder 5 is located on the passenger side (right) bank toward the rear. This position can make access challenging but follows Ford's standard cylinder numbering convention.
Common Causes on V6 Explorers
Spark plug degradation is the most common cause, particularly if the vehicle sees regular towing or heavy use. Ignition coil failure at cylinder 5 can cause isolated misfires. On the 3.0L EcoBoost, carbon buildup on intake valves from direct injection can develop over time. Fuel injector issues, while less common, can cause lean misfires.
Diagnostic Process
Begin by confirming your engine configuration. On V6 models, access cylinder 5's spark plug for inspection. Check the ignition coil with a swap test. Monitor freeze frame data to understand when misfires occur. For high-mileage EcoBoost V6 engines, consider intake valve inspection for carbon accumulation.