The 2022 Ram 3500 heavy-duty truck offers the 6.4-liter Hemi V8 gasoline engine and the powerful 6.7-liter Cummins High Output turbodiesel inline-6 capable of 1,075 lb-ft of torque. Both engines include cylinder 5 as a legitimate position. A P0305 diagnostic trouble code indicates misfire detection at this cylinder.
Understanding P0305 on Ram 3500
The P0305 code signifies "Cylinder 5 Misfire Detected." On the Hemi V8, cylinder 5 is on the driver's side rear. On the Cummins inline-6, cylinder 5 is fifth from the front. Proper engine identification is essential for diagnosis.
Hemi V8 Considerations
The 6.4L Hemi in 3500 applications operates without MDS cylinder deactivation. Heavy-duty use accelerates spark plug and ignition coil wear. The high torque demands during towing stress ignition components, potentially causing cylinder 5 misfire over time.
Cummins Diesel Diagnosis
The majority of Ram 3500 trucks use the Cummins diesel for maximum capability. Diesel misfire at cylinder 5 typically indicates fuel injector failure (common rail injectors are high-precision components), compression issues, or fuel delivery problems. The high injection pressures (up to 29,000 psi) demand precise injector function.
Commercial and Heavy-Duty Use Impact
Many Ram 3500 trucks operate in commercial applications with demanding duty cycles. Frequent heavy towing, fifth-wheel operation, and hot-shot trucking accelerate wear on all engine components. Proactive maintenance is critical for these applications.