Flash: Transmission Control Module (TCM) Updates (21-049-24)

Publication date: 2024-09-17
Reference number: 21-049-24

FLASH: TRANSMISSION CONTROL MODULE (TCM) UPDATES

TECHNICAL SERVICE BULLETIN

Reference Number(s): 21-049-24, Date of Issue: September 17, 2024

CHRYSLER:	2024 (WL) Jeep Grand Cherokee/Grand Cherokee L
GROUP:	21 - Transmission and Transfer Case

VEHICLES AFFECTED

2024 (WL) Jeep Grand Cherokee/Grand Cherokee L

This bulletin applies to vehicles equipped with a 3.6L V6 24 VVT Engine Upg 1 w/ESS (Sales Code ERC) and a 8-Spd Auto 850RE Trans (Sales Code DFT) or 8-Spd Auto 8HP50 Trans (Sales Code DFW).

CUSTOMER SYMPTOM

Customers may comment on one or more of the following:

Vehicle shifting is erratic and/or engine RPM holding too high in one gear.
Harsh 2-1 shift (bump) when coming to a stop.

CAUSE

TCM Software

REPAIR SUMMARY

This bulletin involves reprogramming the TCM with the latest available software.

CLAIMS DATA

CLAIMS INFORMATION

Labor Operation No:	Labor Description	Skill Category	Labor Time
18-19-05-SC	Module, Transmission Control (TCM) - Reprogram (0 - Introduction)	2 - Automatic Transmission	0.2 Hrs.
Failure Code	CC	Customer Concern

The dealer must use failure code CC with this Technical Service Bulletin.

If the customer's concern matches the SYMPTOM identified in the Technical Service Bulletin, failure code CC is to be used.
When utilizing this failure code, the 3C's (customer's concern, cause and correction) must be provided for processing Technical Service Bulletin flash/reprogramming conditions.

DIAGNOSIS

Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in DealerCONNECT/Service Library, verify all related systems are functioning as designed. If DTCs or symptom conditions, other than the ones listed above are present, record the issues on the repair order and repair as necessary before proceeding further with this bulletin.

If the customer describes any of the symptoms listed above in the customer symptom section, perform the Repair Procedure.

SPECIAL TOOLS/EQUIPMENT

SPECIAL TOOLS INFORMATION

Description	Ref. No.	Notes
wiTECH or Equivalent	-	-

REPAIR PROCEDURE

NOTE: Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow the charging voltage to climb above 13.5 volts during the flash process.

NOTE: The vehicle must not be connected to a high voltage charger when performing software updates.

NOTE: If this flash process is interrupted/aborted, the flash should be restarted.

Reprogram the TCM with the latest software. If issues arise when flashing a module using the wiTECH Diagnostic Application, please submit a ticket to the Helpdesk. The helpdesk can be found within the Help menu.
Clear any DTCs that may have been set in any modules due to reprogramming. The wiTECH application will automatically present all DTCs after the flash and allow them to be cleared.

POLICY

Reimbursable within the provisions of the warranty.

This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of FCA US LLC.