2021-2025 Jeep/Ram Misfire DTCs & Valvetrain Noise TSB

Symptoms of Misfire DTCs and Valvetrain Issues

Owners of 2021-2025 Jeep and Ram vehicles may experience several noticeable symptoms indicating an engine issue. These include a "Mil-On/Check Engine Lamp-On" on the dashboard, signifying a detected problem. Drivers might also notice a "noticeable miss" or "rough idle" from the engine, indicating inconsistent combustion.

Another common complaint is "noise (valvetrain)" emanating from the engine compartment. Upon further investigation, these issues are often accompanied by "Misfire DTCs" (Diagnostic Trouble Codes) stored in the Powertrain Control Module (PCM).

Fault Codes / DTCs

While specific DTC codes are not listed in this bulletin, the presence of "Misfire DTCs" in the Powertrain Control Module (PCM) is a key indicator of the underlying problem. These codes point to an engine misfire condition that requires diagnosis.

Diagnosis and Trigger Conditions

The conditions leading to these symptoms, including "Misfire DTCs", are typically related to worn intake camshaft high lift lobe(s) and/or worn intake rocker arm(s) high lift slider wear. This type of failure commonly occurs within a mileage range of 10,000 to 60,000 miles.

To diagnose the issue, technicians should first remove the valve cover(s) following published service procedures. Using a stethoscope and/or specific misfire DTCs can help pinpoint the condition to either the left or right engine bank. Visual confirmation of wear on the high lift intake lobe(s) and rocker arm(s) slider is crucial for proper diagnosis.

Repair Procedure Summary

Once wear on the high lift intake lobe(s) and rocker arm(s) slider is visually confirmed, a special service kit is available for repair. This kit is designed to address the specific wear and should be used as an alternative to replacing the entire engine or long block assembly. The kit contains all necessary parts for the repair, including the intake cam, rocker arms, sealer, and gaskets.

Required Tools or Parts

For the repair of these valvetrain issues and associated "Misfire DTCs", specific service kits are required:

• Right Intake PN: 68661147AA (or equivalent) - This kit includes the right intake cam, rocker arms, sealer, and gaskets.
• Left Intake PN: 68661146AA (or equivalent) - This kit includes the left intake cam, rocker arms, sealer, and gaskets.

Important Warnings

Owners and technicians should be aware of the following critical information regarding this repair:

• "Check with your parts department to ensure that the proper service repair parts are used for the vehicle you are attempting to repair."

Owner Action

If you own a 2021-2025 Jeep or Ram vehicle and are experiencing symptoms such as a "Check Engine Lamp-On", rough idle, a noticeable engine miss, or valvetrain noise, it is recommended to have your vehicle inspected by a qualified service technician. They can diagnose the cause of the "Jeep Wrangler Misfire DTCs" or similar issues in other models and perform the necessary repairs using the specified service kits under TSB S2509000004.

Source: NHTSA ID 11016439