When your 2022 Jeep Grand Wagoneer displays the P0305 code, the engine control module has detected repeated misfires in cylinder 5. The 2022 Grand Wagoneer uses V8 engines exclusively—either the 6.4L Hemi or twin-turbo 3.0L Hurricane inline-six. All configurations have at least six cylinders, making P0305 a legitimate diagnostic code.
2022 Grand Wagoneer Powertrain
The flagship 2022 Grand Wagoneer offers the 6.4L Hemi V8 (471 hp) as standard, with the 3.0L twin-turbo Hurricane I-6 (510 hp) available. Both have cylinders numbered through at least 6, validating P0305.
Cylinder 5 Location
On the 6.4L Hemi V8, cylinder 5 is on the driver side (left bank) at the front. On the Hurricane I-6, cylinder 5 is toward the rear of the inline configuration. Stellantis places odd cylinders on the driver side for V8s.
Common Causes
On a first-year premium vehicle, manufacturing defects or loose connections are possible. Ignition coil failure can occur. Check for TSBs. The Hemi's MDS cylinder deactivation could potentially cause issues on affected cylinders.
Diagnostic Process
Read all codes and freeze frame data. Check for TSBs. Inspect cylinder 5's spark plug and ignition coil. Verify fuel injector operation. A 2022 model should have warranty coverage.