2021-2025 Jeep Wrangler / Gladiator Misfire DTCs and Rough Idle

Owners of 2021-2025 Jeep Wrangler, Gladiator, Dodge Durango, and RAM 1500 vehicles equipped with the 3.6L PSU Long Block engine may encounter issues such as misfire DTC codes, rough idle, or valvetrain noise. This manufacturer communication, TSB 9100498, identifies the root cause and outlines a specific repair procedure to resolve these problems.

Symptoms

Vehicle owners might notice one or more of the following symptoms, particularly in vehicles with 10,000 to 60,000 miles:

• Misfire DTC codes indicating engine misfires.
• Rough idle where the engine runs unevenly when stationary.
• Valvetrain noise, which can manifest as ticking or tapping sounds from the engine.

These conditions are frequently linked to wear on the intake camshaft's high lift lobe(s) and the corresponding intake rocker arm(s) high lift slider.

Diagnosis

To accurately diagnose the issue described in TSB 9100498, technicians will follow a specific process:

1. Valve Cover Removal: The first step involves removing the valve cover(s) according to standard service procedures to gain access to the valvetrain components.
2. Locating the Condition: A stethoscope or specific cylinder misfire diagnostic trouble codes (DTCs) can help pinpoint whether the issue is on the left or right bank of the engine.
3. Visual Confirmation: Once the valve covers are off, technicians will visually inspect the high lift intake lobe(s) and rocker arm(s) slider for signs of wear. This visual confirmation is crucial before proceeding with the repair.

Repair Procedure Summary

Instead of replacing the entire engine or long block, TSB 9100498 specifies using a special service kit designed for this particular type of repair. This kit includes all necessary components such as the intake cam, rocker arms, sealer, and gaskets.

After confirming the repair will be performed using the camshaft/rocker arms kit, it is also vital to ensure the vehicle has the latest calibration/software update for the oil pump's high-pressure operation mode during engine startup. This update helps optimize engine performance and longevity.

• Software Updates: For RAM 1500 (RU), Jeep Grand Cherokee / Grand Cherokee L (VF, WL), and Dodge Durango (WD) vehicles, the latest oil pump mode software is already included in all 2025 model year (25MY) and newer vehicles. For 2024 model year (24MY) vehicles, service releases are available.
• Jeep Wrangler and Gladiator Updates: Jeep Wrangler (JL) and Jeep Gladiator (JT) models received this update as a running change in 2024MY and beyond, specifically on August 15, 2024, and August 19, 2024, respectively. 24MY service releases are also available for these models.
• Dodge Durango Updates: Dodge Durango (DT) models were updated starting with the 2025MY and beyond.

If a 2024MY vehicle requires repair and has a service release available, technicians must follow the released service procedures to apply the corresponding calibration/software update.

Required Tools or Parts

The primary component for this repair is a specialized service kit. This kit contains:

• Intake cam
• Rocker arms
• Sealer
• Gaskets

The specific part numbers for these kits are 68293286A$, 68361456A$, 68423711A$, 68565531A$, and 68565534A$.

Important Warnings

This bulletin explicitly states that a special service kit should be used for this repair instead of replacing the complete engine/long block. This guidance is crucial for proper and cost-effective resolution of the issue. Owners should be aware of this to ensure the correct repair procedure is followed.

Owner Action

If your 2021-2025 Jeep Wrangler, Gladiator, Dodge Durango, or RAM 1500 is exhibiting misfire DTC codes, rough idle, or valvetrain noise, it is recommended to schedule an appointment with an authorized dealership. Inform them of the symptoms you are experiencing. The dealership will be able to diagnose the issue using TSB 9100498 and perform the necessary repairs, including the installation of the service kit and any required software updates.

NHTSA ID: 11015065