A P0303 code on your 2022 Ram 2500 indicates the powertrain control module has detected a misfire in cylinder 3. The heavy-duty Ram 2500 with the gasoline engine uses the 6.4L HEMI V8, which requires specific diagnostic procedures different from the lighter-duty 5.7L HEMI.
6.4L HEMI Engine Layout
The 2022 Ram 2500's 6.4L HEMI V8 positions cylinder 3 on the driver's side (left bank). This naturally aspirated big-block HEMI produces 410 horsepower and uses a traditional sequential fuel injection system without the MDS cylinder deactivation found in some 5.7L applications.
Common Causes
- Ignition Coil Failure: High-output engines demand reliable ignition components
- Spark Plug Wear: The 6.4L uses conventional spark plugs requiring periodic replacement
- Fuel Injector Issues: High fuel flow requirements can stress injectors
- Intake Manifold Leaks: Large manifold with multiple potential leak points
- Valve Train Problems: Hydraulic lifter or rocker arm issues
Diagnostic Process
Connect a diagnostic scanner capable of reading HEMI-specific data. Monitor misfire counts across all eight cylinders. Unlike 5.7L models, the 6.4L doesn't have MDS complications. Focus on ignition, fuel delivery, and mechanical compression testing.
Repair Solutions
Replace failed ignition coils with Mopar HD-rated components. Install spark plugs designed for the 6.4L's higher output. Address fuel injector problems through professional cleaning or replacement. Diagnose valve train issues if misfires persist after ignition and fuel repairs.