2021-2023 Jeep Wrangler DTCM Update for DTC C140E-00

Owners of 2021-2023 Jeep Wrangler vehicles equipped with the 6.4L V8 SRT Hemi MDS Engine (Sales Code ESG) and 2.72:1 Select-Trac Full Time 4WD System (Sales Code DHP) may experience a Malfunction Indicator Lamp (MIL) illumination accompanied by a specific diagnostic trouble code. This issue, detailed in Technical Service Bulletin (TSB) 08-162-24, points to a problem with the transfer case motor.

This TSB, dated July 11, 2024, outlines a software update for the Drivetrain Control Module (DTCM) and, if necessary, the replacement of the transfer case motor actuator to resolve the "Transfer Case Motor Blocked" condition indicated by the Jeep Wrangler C140E-00 fault.

Symptoms

If your 2021-2023 Jeep Wrangler is affected by this issue, you will typically observe the following:

• A Malfunction Indicator Lamp (MIL) illuminated on your dashboard.
• The vehicle will exhibit or set a specific Diagnostic Trouble Code (DTC) related to the transfer case.

Fault Codes / DTCs

The primary diagnostic trouble code associated with this bulletin is:

Code	Description	Module
C140E-00	Transfer Case Motor Blocked	Drivetrain Control Module (DTCM)

Diagnosis

Before proceeding with any repairs, a technician will use a Scan Tool, such as wiTECH, along with diagnostic procedures available in DealerCONNECT/Service Library. This is to ensure all related systems are functioning correctly. If any other DTCs or symptoms are present beyond the Jeep Wrangler C140E-00, they must be recorded and addressed first.

If the customer's reported symptom matches the Malfunction Indicator Lamp illumination and the presence of DTC C140E-00, the repair procedure outlined in TSB 08-162-24 will be followed.

Repair Procedure Summary

The repair for the Jeep Wrangler C140E-00 issue primarily involves updating the Drivetrain Control Module (DTCM) software. The steps are as follows:

1. DTCM Reprogramming: The technician will reprogram the DTCM with the latest available software using the wiTECH Diagnostic Application. If any issues occur during this process, a ticket will be submitted to the Helpdesk.
2. DTC Clearance: After the flash, all Diagnostic Trouble Codes that may have been set in any module due to reprogramming will be cleared using the wiTECH application.
3. Road Test and Verification: The vehicle will be road tested, and the transfer case will be shifted into each position to confirm proper functionality.
4. Actuator Replacement (If Necessary): If the transfer case does not function properly after the software update, and DTC C140E-00 along with a "Service 4WD" MIL are still present, the transfer case motor actuator will be replaced. This involves referring to detailed service procedures in DealerCONNECT/Service Library under "Service Info >21 - Transmission and Transfer Case / Transfer Case, MP3022C / Motor, Shift / Removal and Installation."

Required Tools or Parts

To perform this repair, specific tools and parts are necessary:

• Diagnostic Tool: wiTECH or an equivalent diagnostic system.
• Replacement Part (if needed): Actuator, Transfer Case Shift Motor (Part No. 68391530AA).

Important Warnings for Owners

Owners should be aware of critical information regarding the repair process:

• During the DTCM reprogramming, a battery charger must be installed to maintain battery voltage above 13.2 volts. The charging voltage must not exceed 13.5 volts. This ensures the flash process is stable and successful.
• If the software flash process is interrupted or aborted for any reason, it must be restarted from the beginning to prevent potential module damage or incomplete updates.

Warranty Information

This repair, identified by TSB 08-162-24, is reimbursable within the provisions of the vehicle's warranty. Dealers are instructed to use failure code CC (Customer Concern) if the customer's reported symptom matches the issue described in the bulletin. When using this failure code, the dealer must provide the 3C's (customer's concern, cause, and correction) for processing the Technical Service Bulletin flash/reprogramming conditions.

Owner Action

If your 2021-2023 Jeep Wrangler is displaying a Malfunction Indicator Lamp and you suspect a "Transfer Case Motor Blocked" condition or have confirmed DTC C140E-00, it is recommended to schedule an appointment with your authorized Jeep dealer. They will be able to diagnose the issue and perform the necessary DTCM software update or transfer case motor actuator replacement as per TSB 08-162-24.

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Source: NHTSA ID: 11004888