The 2024 Ram 1500 continues as America's most innovative full-size truck, available with either the proven 5.7L HEMI V8 or the efficient 3.6L Pentastar V6. When your Ram 1500 displays a P0304 code indicating a cylinder 4 misfire, understanding your engine configuration helps target the diagnosis effectively.
Understanding P0304 in the Ram 1500
In the HEMI V8, cylinder 4 is located on the right bank of the engine. In the Pentastar V6, cylinder 4 is on the rear of the right bank. Both engines use individual coil-on-plug ignition systems allowing targeted diagnosis. The powertrain control module monitors each cylinder's contribution through crankshaft position analysis.
MDS System Considerations
The HEMI's Multi-Displacement System (MDS) deactivates cylinders under light load for fuel economy. Cylinder 4 participates in this deactivation, and issues with the MDS solenoids or lifters can cause misfires specifically when entering or exiting cylinder deactivation mode. Monitor when misfires occur—during steady highway cruising may indicate MDS-related issues.
Diagnostic Approach
Access the cylinder 4 ignition coil on the right side of the engine. On HEMI models, also inspect the MDS solenoid wiring if equipped. Remove the spark plug and examine electrode condition. Check for vacuum leaks in the intake manifold. On new 2024 models, verify all software updates have been applied.
Resolution Strategy
Replace spark plugs with Mopar specification components. Test ignition coil output. On HEMI models with MDS, verify solenoid operation if misfires correlate with cylinder deactivation events. Warranty coverage applies to component failures on new vehicles.