The P0302 diagnostic code on your 2022 Jeep Grand Wagoneer indicates cylinder 2 is experiencing misfires detected by the engine control module. The luxury full-size SUV is powered by the 6.4L Hemi V8 producing 471 horsepower (510 in Hurricane edition). This high-performance V8 with Multi-Displacement System has specific diagnostic considerations.
6.4L Hemi V8 Overview
The 6.4L Hemi is a 90-degree V8 with port fuel injection and Multi-Displacement System (MDS) cylinder deactivation. Cylinder 2 is on the driver's side bank. MDS can deactivate up to four cylinders during light-load cruising to improve fuel economy. The sophisticated system can cause cylinder-specific issues if MDS components malfunction.
Common Misfire Causes
MDS lifter or solenoid failure can cause cylinder-specific misfires when the system attempts to deactivate or reactivate cylinders. Standard ignition causes include coil failure and spark plug wear. Fuel injector problems affect cylinder-specific delivery. Port injection means carbon buildup isn't a concern.
MDS System Considerations
The Multi-Displacement System uses special lifters and oil control solenoids. When MDS components fail, the affected cylinder may not fire properly during transitions between V8 and V4 modes. MDS-related misfires often correlate with highway cruising conditions.
Symptom Recognition
The large luxury SUV displays rough idle, vibration, and hesitation with misfires. The smooth V8 character becomes noticeably disrupted. Check engine light accompanies detected misfires. Symptoms may be more pronounced during MDS activation.
Diagnostic and Repair Strategy
Scan for all codes including MDS-related codes. Monitor MDS operation during diagnosis. Inspect ignition components on cylinder 2. Test fuel system. MDS component failures may require lifter replacement. Given the newer model year, warranty coverage should apply.