A P0302 code on your 2019 Jeep Cherokee indicates the engine control module has detected misfires in cylinder 2. The 2019 Cherokee refreshed the model with updated styling and the new 2.0L turbocharged engine option alongside the existing 2.4L and 3.2L V6. Each powertrain requires different diagnostic approaches.
2019 Engine Lineup
The 2.4L Tigershark produces 180 horsepower with multi-port injection. The 3.2L Pentastar V6 delivers 271 horsepower, also port-injected. The new-for-2019 2.0L turbo produces 270 horsepower with direct injection. Cylinder 2 is second from front on inline-4 engines and rear bank on the V6.
Naturally Aspirated Engine Causes
The 2.4L and 3.2L share common misfire causes: ignition coil failure, spark plug wear, fuel injector clogging, and vacuum leaks. Port injection means carbon buildup isn't a significant concern. These engines respond well to standard diagnostics.
2.0L Turbo Considerations
The turbocharged engine adds complexity. Direct injection can lead to carbon buildup on intake valves. Boost pressure irregularities affect combustion. Higher cylinder pressures increase ignition component stress. First-year turbo installations may have had software refinements.
Symptom Recognition
The Cherokee displays rough idle, vibration, and hesitation with cylinder 2 misfires. The compact SUV's driving character suffers when cylinder 2 doesn't contribute properly. Check engine light accompanies the condition.
Diagnostic and Repair Strategy
Identify your engine type. Scan for all codes including boost codes on turbo models. Inspect ignition components. Test fuel delivery appropriate to injection type. Standard maintenance resolves most conditions.