NUMBER:

21-027-15 REV. B

GROUP:

Transmission and
Transfer Case

DATE:

August 15, 2015

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.

THIS BULLETIN SUPERSEDES SERVICE BULLETIN 21-027-15 REV. A, DATED
AUGUST 05, 2015, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL
REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE UPDATES TO
BUILD RANGE.
HELP USING THE wiTECH DIAGNOSTIC APPLICATION FOR FLASHING AN ECU IS
AVAILABLE BY SELECTING “HELP” THEN “HELP CONTENTS” AT THE TOP OF
THE wiTECH DIAGNOSTIC APPLICATION WINDOW.
THE wiTECH SOFTWARE IS REQUIRED TO BE AT THE LATEST RELEASE BEFORE
PERFORMING THIS PROCEDURE.
SUBJECT:
Flash: Transmission Shift Enhancements
OVERVIEW:
This bulletin involves reprogramming of the Transmission Control Module (TCM) with the
latest available software.
MODELS:
2015

(WK)

Jeep Grand Cherokee

2015

(WD)

Dodge Durango

NOTE: This bulletin applies to vehicles within the following markets/countries:
NAFTA, EMEA, APAC.
NOTE: **This bulletin applies to WK vehicles built on or before June 12, 2015 (MDH
0612XX) equipped with a 3.6L Engine (Sales Code ERB) and an Automatic
Transmission 845RE (Sales Code DFL).**
NOTE: This bulletin applies to WD vehicles built on or after March 30, 2015 (MDH
0330XX) and on or before June 07, 2015 (MDH 0607XX).
NOTE: This bulletin applies to vehicles built on or before April 9, 2015 (MDH 0409XX)
equipped with the 845RE 8 speed transmission (Sales Code DFL) and a 3.0L
Gas Engine (Sales Code EHD).

21-027-15 REV. B

-2-

SYMPTOM/CONDITION:
A small number of customers may experience an erroneous Malfunction Indicator Lamp
(MIL) Illumination. Upon further investigation, the technician may find a Diagnostic Trouble
Code (DTC) stored in the TCM memory.
In addition, the following TCM calibration improvements are also available for vehicles
equipped with the 845RE 8 speed transmission (Sales Code DFL). These improvements
are listed per engine application.
3.0L Gas Engine (Sales Code EHD)
•
•
•
•
•
•
•
•
•

P1DCD - TCM monitoring processor performance multiple clutches locked up.
P1B13 - Park-By-Wire unintended out of park position.
P0734 - Gear 4 Shift Incorrect Ratio.
Improved upshift timing.
Improved torque converter engagement.
Improved shift timing during tow mode operation.
Improved shift points during aggressive driving.
Calibration improvement to correct bump feel during 2-1 downshift.
Improved shift timing while in snow, base, and hill modes.

3.6L Gas Engine (Sales Code ERB)
•
•
•
•
•
•
•
•

P1DCD - TCM monitoring processor performance multiple clutches locked up.
P1B13 - Park-By-Wire unintended out of park position.
P0734 - Gear 4 Shift Incorrect Ratio.
Improved 4-3 and 3-2 downshifts.
Improved shift timing at higher altitudes.
Improved shift timing while in sand mode.
Calibration improvement for multi-gear downshift timing during passing maneuvers.
Calibration improvement for intermittent delayed upshift.

DIAGNOSIS:
Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in
TechCONNECT, verify all vehicle 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 the symptom/condition listed above or if the technician finds the
DTC, perform the Repair Procedure.

-3-

21-027-15 REV. B

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.
1. Reprogram the TCM with the latest available software. Detailed instructions for
flashing control modules using the wiTECH Diagnostic Application are available by
selecting the “HELP” tab on the upper portion of the wiTECH window, then “HELP
CONTENTS.” This will open the Welcome to wiTECH Help screen where help topics
can be selected
2. 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 the
them to be cleared.
NOTE: DO NOT CLEAR THE SHIFT ADAPTIVES IN THE TCM’S MEMORY. THIS
ACTION MAY CAUSE THE TRANSMISSION TO NOT SHIFT SMOOTHLY UNTIL
THE ADAPTIVES ARE RE-LEARNED.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation
No:
18-19-05-BV

Description
Module, Transmission Control
(TCM) - Reprogram
(1 - Semi-Skilled)

Skill Category
21- Automatic
Transmission

Amount
0.2 Hrs

NOTE: The expected completion time for the flash download is approximately 1
minute. Actual flash download times may be affected by vehicle connection
and network capabilities.
FAILURE CODE:
The dealer must choose which failure code to use. If the customer came in with an
issue and the dealer found updated software to correct that issue, use failure code
CC, for all other use failure code RF.
•
•

If the customer’s concern matches the SYMPTOM/CONDITION identified in the
Service Bulletin, than failure code CC is to be used.
If an available flash is completed while addressing a different customer concern,
failure code RF is to be used.

CC

Customer Concern

RF

Routine Flash