Flash: Transmission Control Module (TCM) Updates (21-034-20)

WARNING: This page is about the Gladiator Altitude, Automatic Trans, which is a different variant/trim than selected.

Publication date: 2020-04-25
Reference number: 21-034-20

FLASH: TRANSMISSION CONTROL MODULE (TCM) UPDATES

TECHNICAL SERVICE BULLETIN

Reference Number(s): 21-015-24, Date of Issue: February 20, 2024

CHRYSLER:	2020 (JT) Jeep Gladiator
GROUP:	21 - Transmission and Transfer Case

Superceded Bulletin(s): 21-034-20, Date of Issue: April 25, 2020

VEHICLES AFFECTED

2020 (JT) Jeep Gladiator

This bulletin applies to vehicles equipped with a 3.6L V6 24V VVT Engine UPG I w/ESS (Sales Code ERC) and an 8-Spd Auto 850RE Transmission (Sales Code DFT).

CUSTOMER SYMPTOM

The customer may experience one or more of the following:

**Loud popping noise from transmission at vehicle start.**
A loud whistle noise upon engine start up.

CAUSE

TCM Software.

NOTE: This bulletin supersedes Technical Service Bulletin (TSB) 21-034-20, date of issue April 25, 2020, which should be removed from your files. All revisions are highlighted with **asterisks** and include a new Customer Symptom and LOP.

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-R4	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 Diagnostic Trouble Codes (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: If this flash process is interrupted/aborted, the flash should be restarted.

Reprogram the TCM with the latest software. Detailed instructions for flashing control modules using the wiTECH Diagnostic Application are available by selecting the application's "HELP" tab.
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.