The 2022 Ram 3500 is built for the most demanding heavy-duty applications, powered by the capable 6.4L HEMI V8 gasoline engine. When your Ram 3500 displays a P0304 code indicating a cylinder 4 misfire, prompt diagnosis ensures this workhorse maintains the reliable power required for serious towing and hauling.
Understanding P0304 in the Ram 3500
The 6.4L HEMI in your Ram 3500 is engineered for maximum durability in commercial-grade applications. Unlike the 5.7L HEMI in lighter trucks, this engine does not use Multi-Displacement System cylinder deactivation. Cylinder 4 is located on the right (passenger) bank of the V8. The engine control module monitors combustion events with precision.
Heavy-Duty Application Demands
The Ram 3500's most demanding use cases—heavy towing and commercial applications—place exceptional stress on ignition components. Sustained high-load operation accelerates spark plug wear beyond normal passenger vehicle patterns. The cooling and electrical systems must maintain optimal operation under these conditions.
Diagnostic Process
Access the cylinder 4 ignition coil on the right bank. Remove the spark plug and assess wear—heavy commercial use requires plugs in excellent condition. Check for vacuum leaks in the intake system. Verify fuel pressure meets specifications. Consider the truck's usage pattern when evaluating component wear.
Repair Strategy
Replace spark plugs with Mopar specifications appropriate for heavy-duty operation. If towing frequently, consider shorter replacement intervals than standard recommendations. Test ignition coil output. Ensure cooling system maintains proper temperatures during demanding use.