When your 2020 Dodge Challenger triggers the P0303 code, the engine control module has identified repeated misfires in cylinder 3. The muscle car offers multiple engine options from the efficient V6 to the supercharged Hellcat.
Engine Options and Cylinder Layout
The 2020 Challenger offers the 3.6L Pentastar V6, 5.7L HEMI V8 (with MDS), 6.4L HEMI V8, and supercharged variants. On HEMI V8s, cylinder 3 is located on the driver's side (left bank). The Pentastar V6 positions cylinder 3 at the rear of the left bank.
Common Causes
- Ignition Coil Failure: Performance use accelerates coil wear
- Spark Plug Issues: HEMI engines require specific two-piece plugs
- MDS Lifter Problems: 5.7L HEMI cylinder deactivation lifters can fail
- Fuel Delivery Issues: High-performance fuel demands
- Valve Train Wear: Lifter or pushrod problems
Diagnostic Approach
Identify your engine configuration first. Connect a diagnostic scanner to access misfire data and MDS status on applicable models. Test ignition components through swap testing before moving to fuel and mechanical causes.
Repair Solutions
Replace faulty ignition coils with Mopar performance components. Follow proper HEMI spark plug procedures to avoid breakage. For MDS-related failures, lifter replacement is typically required. Address fuel system issues as diagnosed.