2021-2023 Jeep, Dodge, Ram No Reverse/Forward Gear After Repair

Stellantis has released manufacturer communication S2421000001, dated July 2024, to address a significant transmission issue affecting various 2021-2023 Jeep, Dodge, and Ram models. This bulletin highlights instances where vehicles may experience a complete loss of reverse and/or forward gear engagement following a D-Clutch repair. Owners searching for "Jeep Wrangler no reverse gear" or similar symptoms should be aware of this communication.

This problem is specifically linked to the D-Clutch repair procedure outlined in a previous technical service bulletin, TSB 21-039-24 REV. A. The core of the issue appears to be related to missing components within the transmission during the repair process.

Symptoms of Transmission Gear Engagement Failure

The primary symptom described in bulletin S2421000001 is the complete inability to engage either reverse or forward gears. This means that after a D-Clutch repair, the vehicle may not move in either direction, rendering it inoperable. If you've recently had a D-Clutch repair and are now experiencing "No Reverse And/Or Forward Gear After D-Clutch Repair", this bulletin directly applies to your situation.

Understanding the Cause: Missing Nylon Sealing Rings

The root cause identified for this critical transmission failure is the absence of two specific nylon sealing rings on the output shaft carrier assembly. These rings are crucial for the proper hydraulic function and sealing within the transmission, enabling gear engagement. When these seals are missing, the transmission cannot build or maintain the necessary pressure for the P4 Planetary carrier/output shaft assembly to function correctly, leading to the reported Jeep Wrangler no reverse gear symptom.

Diagnosis and Inspection

For technicians encountering a vehicle with this condition after performing the D-Clutch repair, the bulletin instructs them to remove and inspect the P4 Planetary carrier/output shaft assembly. The inspection specifically targets the presence of the two nylon sealing rings. The original document includes a visual reference, Figure 1, to aid technicians in identifying whether these seals are missing from the output shaft carrier assembly.

Repair Procedure and Parts

If the inspection confirms that the nylon sealing rings are indeed missing, the resolution requires ordering an entirely new repair kit. The bulletin explicitly states that these critical sealing rings are not available for purchase separately at this time. Stellantis (Mopar) acknowledges that some repair kits currently in circulation may be missing these seals and is actively working to resolve this supply chain concern, with a resolution expected shortly.

Important Warnings for Owners

Owners experiencing this issue should be aware of a critical advisory from Stellantis: "It is not recommended to replace the transmission if you encounter this concern." This warning is vital, as replacing the entire transmission would be an unnecessary and costly repair for a problem that stems from missing, inexpensive components that can be resolved by acquiring a complete, correctly supplied repair kit.

What Owners Should Do

If your 2021-2023 Jeep, Dodge, or Ram vehicle has undergone a D-Clutch repair (referencing TSB 21-039-24 REV. A) and you are now experiencing the symptom of "No Reverse And/Or Forward Gear After D-Clutch Repair," you should contact your authorized dealership immediately. Inform them about Stellantis manufacturer communication S2421000001 and the potential for missing nylon sealing rings. The dealership will perform the necessary inspection and order the appropriate repair kit to resolve the Jeep Wrangler no reverse gear issue.

Source: NHTSA ID 11004944