The 2024 Ram 2500 heavy-duty truck continues with the proven 6.4-liter Hemi V8 gasoline engine and available 6.7-liter Cummins High Output turbodiesel inline-6. A P0305 diagnostic trouble code indicates that cylinder 5 of either engine configuration is experiencing misfire events.
P0305 Code Analysis
P0305 translates to "Cylinder 5 Misfire Detected" in OBD-II terminology. Both the V8 Hemi and inline-6 Cummins in the 2024 Ram 2500 include cylinder 5 as a legitimate position. Identification of your specific engine type is essential for proper diagnosis.
Hemi V8 Misfire Diagnosis
The 6.4L Hemi produces 410 horsepower and doesn't use MDS cylinder deactivation in heavy-duty applications. Common cylinder 5 misfire causes include spark plug degradation (especially under heavy towing loads), ignition coil failure, fuel injector issues, or vacuum leaks at the intake manifold.
Cummins Diesel Diagnosis
The 6.7L Cummins with up to 420 horsepower and 1,075 lb-ft of torque uses high-pressure common rail fuel injection. Diesel misfire causes for cylinder 5 include failing fuel injector, compression loss from worn components, fuel supply issues, or turbocharger problems affecting air delivery.
Heavy-Duty Operating Considerations
The 2024 Ram 2500's capability for demanding work means components experience significant stress. Frequent towing at capacity accelerates wear on ignition (gas) and injection (diesel) system components.