The 2022 Ram 2500 delivers heavy-duty capability with the powerful 6.4L HEMI V8 gasoline engine. When your Ram 2500 displays a P0304 code indicating a cylinder 4 misfire, prompt attention ensures this workhorse maintains the reliable power delivery required for towing and hauling duties.
Understanding P0304 in the Ram 2500
The 6.4L HEMI V8 in your Ram 2500 differs from the half-ton's 5.7L HEMI in several ways—most notably, it does not include the Multi-Displacement System (MDS) found in lighter-duty trucks. Cylinder 4 is located on the right (passenger) bank of the engine. The powertrain control module monitors combustion events through crankshaft position analysis.
Heavy-Duty Application Factors
The 6.4L HEMI operates under demanding conditions when towing or hauling heavy loads. Extended high-load operation accelerates spark plug wear and stresses ignition components. Heat management becomes critical during heavy-duty use. The larger displacement engine has robust ignition requirements that demand components in excellent condition.
Diagnostic Approach
Access the cylinder 4 ignition coil on the right bank. Remove the spark plug and inspect electrode condition—heavy-duty use can accelerate wear. Check for vacuum leaks in the intake manifold. Verify fuel pressure meets specifications under load conditions. Examine the cooling system for any issues that could cause engine overheating.
Resolution Strategy
Replace spark plugs with Mopar heavy-duty specifications if approaching or past service interval. Test ignition coil output. Ensure the cooling system maintains proper temperatures during heavy use. If towing frequently, consider more frequent spark plug replacement intervals.