The P0303 diagnostic trouble code on your 2024 Ram 1500 indicates the powertrain control module has detected repeated misfires in cylinder 3. Depending on your engine configuration—Pentastar V6, eTorque V6, or HEMI V8—the diagnostic approach varies.
Engine Options and Cylinder 3 Location
The 2024 Ram 1500 offers the 3.6L Pentastar V6 (with or without eTorque mild hybrid), the 5.7L HEMI V8 (also with optional eTorque), and the powerful Hurricane twin-turbo six-cylinder. On the V6, cylinder 3 is the rear cylinder on the driver's side bank. On the HEMI V8, cylinder 3 is positioned on the driver's side.
Common Causes
- Ignition Coil Failure: Both V6 and V8 use coil-on-plug ignition systems
- Spark Plug Issues: HEMI engines require specific 16mm thread plugs
- Fuel Injector Problems: Clogged or failed injectors cause inconsistent fuel delivery
- Intake Manifold Leaks: Vacuum leaks affect fuel mixture in specific cylinders
- MDS System Issues: HEMI's Multi-Displacement System can cause cylinder-specific problems
Diagnostic Process
Connect an OBD-II scanner to retrieve misfire data. For HEMI engines, check if MDS operation correlates with misfires. Test ignition components through swap testing. Inspect fuel injector operation and intake system integrity.
Repair Solutions
Replace failed ignition coils or spark plugs with Mopar-approved components. Address fuel injector issues through cleaning or replacement. Repair intake manifold gasket leaks. Update PCM software if a relevant TSB exists.