Flash: Transmission Control Module (TCM) Updates (21-064-15)

WARNING: This page is about the Grand Cherokee Limited, 3.0L Eng VIN M, AWD, Automatic T/Case Control, which is a different variant/trim than selected.

Publication date: 2019-03-02
Reference number: 21-064-15
Supersedes refnos: 21-013-19, 21-027-15, 21-027-15 REV. A, 21-027-15 REV. B, 21-027-15 REV. C, 21-028-15, 21-030-16, 21-039-14

FLASH: TRANSMISSION CONTROL MODULE (TCM) UPDATES

TECHNICAL SERVICE BULLETIN

Reference Number(s): 21-013-19, Date of Issue: March 2, 2019

CHRYSLER:	2015 Dodge Durango (WD), Jeep Grand Cherokee (WK), Jeep Grand Cherokee (CKD) (W2), Jeep Grand Cherokee (EGYPT CKD) (W3)
GROUP:	21 - Transmission and Transfer Case

Superceded Bulletin(s): 21-030-16, Date of Issue: September 10, 2016

NOTE: THIS BULLETIN SUPERSEDES SERVICE BULLETIN 21-030-16 DATED SEPTEMBER 10, 2016, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDES ADDITIONAL DIAGNOSTIC TROUBLE CODES (DTCS) SYMPTOM/CONDITION AND LOP.

SUBJECT

Flash: Transmission Control Module (TCM) Updates

OVERVIEW

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

MODELS

MODELS CHART

2015	(WD)	Dodge Durango
2015	(WK)	Jeep Grand Cherokee
2015	(W2)	Jeep Grand Cherokee (CKD)
2015	(W3)	Jeep Grand Cherokee (EGYPT CKD)

NOTE: This bulletin applies to vehicles equipped with the following:

Vehicles equipped with a 5.7L gas engine (Sales Code EZH) and equipped with the 8HP70 8 speed transmission (Sales Code DFD) or (Sales Code DFK).
Vehicles equipped with a 3.0L gas engine (Sales Code EHD) and equipped with the 845RE 8 speed transmission (Sales Code DFL).
Vehicles equipped with a 3.6L gas engine (Sales Code ERB) and equipped with the 845RE 8 speed transmission (Sales Code DFL).

SYMPTOM/CONDITION

Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:

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.

In addition the following enhancements are included in this update:

Improved upshift timing.
Improved torque converter engagement.
Improved shift points during aggressive driving.
Calibration improvement to correct bump feel during 2-1 downshift.
Improved shift timing while in tow, 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.

In addition the following enhancements are included in this update:

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.

5.7L gas engine (Sales Code EZH)

In addition the following enhancements are included in this update:

**Improved 5-4 and 2-1 coast downshift.**
Improved upshift timing in ECO, BASE, and HILL modes and while using cruise.
Improved 8-7, 3-2, and 2-1 downshift timing.
Improved shift timing at higher altitudes.
Improved torque converter engagement.
Shift quality calibration enhancements to address shift flare and garage shift complaints.

DIAGNOSIS

Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in Dealer Connect/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 the symptom/condition listed above or if the technician finds the DTC, perform the Repair Procedure.

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.
Using wiTECH perform routine Reset Adaptive Values.
Perform process to relearn the Adaptive Values. Refer to all applicable published service bulletins for detailed repair procedures and labor times regarding a Quick Learn or Static Adaptation (STADA) routine.

POLICY

Reimbursable within the provisions of the warranty.

TIME ALLOWANCE

TIME ALLOWANCE CHART

Labor Operation No:	Description	Skill Category	Amount
**18-19-05-LH	Module, Transmission Control (TCM) - Reprogram (0 - Introduction)	2 - Automatic Transmission	0.2 Hrs.**

NOTE: The expected completion time for the flash download portion of this procedure is approximately 4 minutes. Actual flash download times may be affected by vehicle connection and network capabilities.

FAILURE CODE

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

If the customer's concern matches the SYMPTOM/CONDITION identified in the 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 Service Bulletin flash/reprogramming conditions.

FAILURE CODE CHART

CC	Customer Concern