Daimler Trucks

Field Service Campaign

North America LLC
March 2021
D21M3

Subject: DT12 Gear Grind During Downshift Software Update
Models Affected: DT12 Transmissions

General Information
Daimler Trucks North America LLC, on behalf of its DETROITTM Powertrain Division, is initiating Field Service
Campaign D21M3 to update TCM software on certain DT12 Transmission models to prevent gear grind during
downshift in certain situations.
All the vehicles in the population require programming the TCM, ACM, MCM, and CPC to Model Year 2021 for
compatibility. Please refer to the attached work instructions for MINIMUM software versions.
Affected DT12 transmissions built between August 2018 and December 18, 2020.
There are approximately 6488 units affected by this Field Service Campaign.
Note that some transmissions may already be reprogrammed. These transmissions will be excluded from this Field
Service Campaign; the currently available software levels may be higher than the minimum levels shown above.

Work Instructions
Please refer to the attached work instructions. Prior to performing this field service campaign, check the vehicle
for a completion sticker (Form WAR261).

Labor Allowance
Table 1 – Labor Allowance for D21M3
Procedure

Time Allowed
(hours)

SRT Number

Corrective Action

D21M3
Inspection Only – No Programming
Required

0.1 Hours

996-F208A

06- Inspect

Reprogram MCM, ACM, CPC, TCM

0.7 Hours

996-F208B

12-Repair
Recall/Campaign

Daimler Trucks

Field Service Campaign

North America LLC
March 2021
D21M3

Claim Reimbursement
Obtain reimbursement for parts, labor, and handling (landed cost for Export Distributors) by submitting your claim
through the Warranty system within 30 days of campaign completion. Please reference the following information in
OWL.
Table 2 – Claim Reimbursement
Claim Type
Campaign
(number with appropriate condition code)

Component Code
Cause Code
Primary Failed Part

Field Service Campaign
D21M3
043-007-205
A1 – Campaign
DDC REPROGRAM3
Procedure A1

Labor Number

996-F208A
Inspection Only – No Programming Required

Labor Hours

0.1 Hours

Part Number

DDC REPROGRAM3

Parts Return

NONE

Use the following procedure if programming was REQUIRED.
Procedure B1
Labor Number

1

996-F208B
Reprogram MCM, ACM, CPC, TCM

Labor Hours

0.7 Hours

Part Number

DDC REPROGRAM3

Parts Return

NONE

Administrative time (SRT 939-6010A) for 0.3 hours is automatically added to the claim.

This Field Service Campaign will terminate on March 16, 2022. Dealers will be notified of any changes.
IMPORTANT: OWL must be viewed prior to beginning work to ensure the vehicle is involved and the campaign has
not previously been completed.
All claims must be submitted within 30 days of the repair and within 30 days of the termination date of the campaign.
U.S. and Canadian dealers should contact the Warranty Campaigns Department via Web inquiry at
DTNAConnect.com/WSC, if they have any questions or need additional information.

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Daimler Trucks

Field Service Campaign

North America LLC
March 2021
D21M3

Detroit Diesel Corporation
13400 Outer Drive, West
Detroit, Michigan 48239-4001
Telephone: 313‐592‐5000

Copy of Notice to Owners
Subject: DT12 Gear Grind During Downshift Software Update
Daimler Trucks North America LLC, on behalf of its DETROITTM Powertrain Division, is initiating Field Service
Campaign D21M3 to update TCM software on certain DT12 Transmission models to prevent gear grind during
downshift in certain situations.
Records available to us indicate that your vehicle has one of the eligible transmissions. Instructions for this
Field Service Campaign have been sent to your local Detroit Diesel Authorized Repair Facility and the labor
time required to perform this update is approximately 0.7 hours.
Please contact a Detroit Diesel Authorized Repair Facility to arrange to have the Field Service Campaign
performed. To locate an authorized facility, search online at https://demanddetroit.com/find-a-dealer/.
This service will be completed for you at no charge, prior to March 16, 2022 under the provisions of this notice.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your
continued satisfaction with our products.
DETROIT WARRANTY CAMPAIGNS DEPARTMENT
Enclosure

Daimler Trucks

Field Service Campaign

North America LLC
March 2021
D21M3

Work Instructions
Subject: DT12 Gear Grind During Downshift Software Update
Models Affected: DT12 Transmissions

Corrective Procedure

GHG21 DD15 & DD16

GHG21 DD13

Vehicle Model
New Cascadia & Western
Star 49X

All Other Models

MCM Software Version

14.3.1.1 ZGS 001

14.3.1.1 ZGS 001

ACM Software Version

7.61.1.0 ZGS 001

7.61.1.0 ZGS 001

CPC Software Version

CPC501T: R20.31.00.00A
CPC302T: 33.13.00

R44_00_000A

TCM Software Version

NAMT201403

NAMT201403

MCM Software Version

DD15: 6.9.0.2 ZGS 001
DD16: 6.9.0.2 ZGS 002

DD15: 6.9.0.2 ZGS 001
DD16: 6.9.0.2 ZGS 002

ACM Software Version

7.61.1.0 ZGS 001

7.61.1.0 ZGS 001

CPC Software Version

CPC501T: R20.31.00.00A
CPC302T: 33.13.00

R44_00_000A

TCM Software Version

NAMT201403

NAMT201403

Minimum Software Versions
1. You MUST use DiagnosticLink® Professional 8.13 Service Pack 1 (or higher) when reprogramming.
REFERENCE DTNAConnect “My Communications” notice dated 12/15/2020 for more information on
DiagnosticLink® 8.13 Service Pack 1.
2. Begin the process by connecting DiagnosticLink® to the vehicle. Make sure that all modules (ACM, CPC,
MCM, and TCM) are connected.

NOTICE: BEFORE you begin programming, make sure the VIN is correct in all modules. If the VIN is incorrect in
any modules, you will receive an error message when attempting to reprogram.

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Daimler Trucks
North America LLC

Field Service Campaign

March 2021
D21M3
3. Make sure the VIN is correct in all modules by looking at the “Identification” screen in DiagnosticLink®. If
the VIN is incorrect, you can correct the VIN under the Actions drop-down menu in DiagnosticLink® by
selecting the “Check VIN Synchronization” item. Select “Start” from this panel and follow the prompts. You
will be prompted to cycle the key until the routine has completed. When synchronization is complete, turn
the key back on and continue with the download process.
4. On the Identification screen, check the current ACM, MCM, CPC, and TCM software and fuel map levels.
The MINIMUM levels required are listed in the above table. See figure below for an example of the
Identification screen for the TCM.
Example: TCM software NAMT191402 is not at the MINIMUM software level required, and needs
updating.

5. Is the software and fuel map ZGS version level for the ACM, MCM, CPC, and TCM less than the software
and fuel map ZGS revision levels listed in the table on page 4?
NOTE: The ACM, MCM, CPC, and TCM software and fuel map ZGS version level must meet the
MINIMUM requirements.
a) Yes, proceed to step 6.
b) No; it is equal to, or greater than the minimum software and fuel map ZGS version levels. No
programming is necessary. Proceed to the Completion Stickers section.
6. Select “Parameters” option along the left side of the DiagnosticLink® screen. Wait for parameters to be
read.
7. Select "Program Device" option along the left side of the DiagnosticLink® screen. There will be "Data to
Upload". Click "Connect to Server".
8. Select the “Add” button in the upper right corner of the DiagnosticLink® screen and enter the engine serial
number. Then click the “Connect to Server” button in the bottom right corner of the DiagnosticLink® screen.
See below figure.

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Daimler Trucks
North America LLC

Field Service Campaign

March 2021
D21M3

9. Program the ACM, MCM, CPC, and TCM, based on the above inspection results and engine serial number
listing included with this recall campaign.
• NOTE: If equipped with CPC501T & ICUC, program the ICUC to the latest software.
• NOTE: ACM software 7.61.1.0 with Model Year 2020 fuel map ending in ZGS 002 is older than
ACM software 7.61.1.0 with Model Year 2021 fuel map ending in ZGS 001. Make sure that the
ACM is programmed to 7.61.1.0 ZGS 001.
10. When programming is complete, click the “Finish” button and perform the following to allow the modules to
synchronize with each other:
• Disconnect the USB Link at 9-pin vehicle diagnostic port.
• Turn the vehicle ignition OFF and wait one minute.
• Turn the vehicle ignition ON and wait one minute.
• Turn the vehicle ignition OFF and wait one minute.
• Turn the vehicle ignition ON and wait one minute.
• Reconnect the USB Link, reconnect DiagnosticLink® to the MCM, ACM, CPC, and TCM, and
confirm the proper software and fuel map levels.

NOTICE: CHECK with the customer to see if Auto Elevate can be enabled. Auto Elevate can prevent
Aftertreatment System (ATS) issues.

11. Ask the customer if they would like Auto Elevate activated. REFERENCE DetroitTM Technical Service letter
16 TS-18 for full details on Auto Elevate.
12. Repairs are complete.

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Daimler Trucks
North America LLC

Field Service Campaign

March 2021
D21M3

Completion Stickers
•

Upon completion of Recall Campaign D21M3, clean a spot on the base label (Form WAR259), write the
Field Service Campaign Number D21M3 on a blank, completion sticker (Form WAR261), and attach the
completion sticker to the base label.

•

Label ordering info: DTNAConnect > Services and Reference > Publications & Warranty Supplies >
Warranty

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