The P0303 diagnostic trouble code on your 2023 Dodge Challenger indicates the powertrain control module has detected repeated misfires in cylinder 3. As one of the final model years of the legendary muscle car, the 2023 Challenger offers powerful V8 options alongside the V6.
2023 Challenger Engine Lineup
The 2023 Challenger offers the 3.6L Pentastar V6, 5.7L HEMI V8, 6.4L HEMI V8, and supercharged Hellcat variants. On the HEMI V8 engines, cylinder 3 is positioned on the driver's side (left bank). The 5.7L HEMI includes MDS cylinder deactivation affecting diagnosis.
Common Causes
- Ignition Coil Failure: Performance applications accelerate wear
- Spark Plug Degradation: HEMI engines require timely plug service
- MDS Lifter Issues: 5.7L HEMI cylinder deactivation component failures
- Fuel Injector Problems: High-flow applications stress injectors
- Intake Manifold Leaks: Vacuum leaks causing lean conditions
Diagnostic Methodology
Identify your engine type first. Use a diagnostic scanner to access engine-specific data streams. On 5.7L models, monitor MDS operation and misfire correlation. Test ignition components systematically before moving to mechanical causes.
Repair Solutions
Replace failed ignition coils with Mopar performance-grade components. Follow proper HEMI spark plug removal procedures. Address MDS-related failures on 5.7L engines through lifter replacement. Repair fuel and intake system issues as diagnosed.