When your 2020 Dodge Charger displays the P0303 code, the powertrain control module has detected consistent misfires in cylinder 3. The Charger offers multiple engine options, each with specific diagnostic considerations.
2020 Charger Engine Options
The 2020 Charger offers the 3.6L Pentastar V6, 5.7L HEMI V8, 6.4L HEMI V8, or supercharged 6.2L Hellcat. On the V6, cylinder 3 is at the rear of the left bank. On HEMI V8s, cylinder 3 is on the driver's side. The MDS system on 5.7L models adds diagnostic complexity.
Common Causes
- Ignition Coil Failure: High-performance applications stress coil packs
- Spark Plug Issues: HEMI engines use specific two-piece plugs
- MDS System Problems: 5.7L HEMI MDS lifters can fail
- Fuel Injector Issues: Performance engines demand precise fuel delivery
- Intake Manifold Leaks: Gasket failures causing lean conditions
Diagnostic Approach
Identify your engine configuration first. Use a diagnostic scanner to access engine-specific data. For MDS-equipped 5.7L engines, monitor if misfires correlate with cylinder deactivation. Test ignition components systematically.
Repair Solutions
Replace failed ignition coils with Mopar components. For HEMI engines, follow proper procedures for two-piece spark plug removal. Address MDS lifter issues on 5.7L models if diagnosed. Repair fuel system and intake leaks as needed.