A P0303 diagnostic code on your 2024 Dodge Hornet indicates the engine control module has detected consistent misfires in cylinder 3. The compact SUV continues with turbocharged powertrains requiring modern diagnostic techniques.
2024 Hornet Powertrains
The 2024 Hornet offers the 2.0L turbocharged four-cylinder (GT) or 1.3L turbo plug-in hybrid (R/T). On both inline-4 configurations, cylinder 3 is the third from the timing chain end. Turbocharging adds complexity to misfire diagnosis.
Typical Causes
- Ignition Coil Problems: Turbo boost increases ignition demands
- Spark Plug Condition: Must match turbo application requirements
- Boost System Integrity: Leaks cause lean misfires
- Fuel Injector Issues: Direct injection deposits or failures
- Carbon Accumulation: GDI engines accumulate intake valve carbon
Diagnostic Process
Connect a diagnostic scanner to access turbo-specific data. Monitor boost pressure, fuel trim, and misfire counts. Test ignition components through swap testing. Check boost system for leaks using appropriate methods.
Repair Recommendations
Replace failed ignition coils with Mopar turbo-rated components. Install spark plugs matching turbo specifications. Repair boost leaks identified during diagnosis. Address carbon buildup through professional cleaning services.