# Service bulletin TechTalk7321

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10182115
- Published by NHTSA: 2020\-11\-04
- Manufacturer's number: TechTalk7321
- Manufacturer's date: 2020\-10\-30
- NHTSA component: POWER TRAIN

## NHTSA's summary

Tech Talk discussion on DT\-12 WILL NOT GO INTO GEAR.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10182115-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10182115-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Vehicles listed

- 2015 FREIGHTLINER CASCADIA

## Recalls for the same vehicles and component

- [16V634000](/recalls/nhtsa/16V634000.md), 2016-08-31: POWER TRAIN:AXLE HUBS
- [15V617000](/recalls/nhtsa/15V617000.md), 2015-10-01: POWER TRAIN:MANUAL TRANSMISSION

## Other bulletins for the same vehicles and component

- [ICI22\-017](/bulletins/10210548.md), 2022-05-03, Service bulletin: POWER TRAIN. Important Campaign Information Letter for DDC D21M1 Termination Date Extended. This letter is to inform you that a revised bulletin for Detroit Diesel Field Service Campaign D21M1, DT12 Transmission Drive Shaft Cover Plug Reseal has been EXTENDED for an additional three months. Please use the extended termination date for all work under D21M1 from this point forward. REVISION: D21M1 termination date extended to July 1, 2022.
- [FAB158](/bulletins/10193732.md), 2021-05-18, Service bulletin: POWER TRAIN. Freightliner Action Bulletin FAB158 Cummins Eaton SmartAdvantage
- [TSN 31\-11](/bulletins/10193166.md), 2021-05-13, Service bulletin: EQUIPMENT; POWER TRAIN. TSN for all Cascadia vehicles equipped with a driveline center bearing midship support. Reference the following illustration \- Customer complaints of loose fasteners at the bracket to channel bolted connection.
- [FTLCAE139\-2013](/bulletins/10193108.md), 2021-05-12, Service bulletin: EQUIPMENT; FUEL SYSTEM, GASOLINE; SEAT BELTS; POWER TRAIN. INTERIOR STORAGE \- Side Storage Bins Removed from Certain Cascadia Sleepers. SEAT BELTS \- Height Adjustment Removed from Cascadia Passenger Side Seat Belt. FUEL TANKS \- Fuel Tank Changes for 25" and 23" Tanks for Model Year 2015. TRANSMISSION \- Correction to Allison 5th Gen Module 84L Definition Example. ADMINISTRATION \- Model Year 2015 Changeover Date Established. APPENDIX A \- 25" and 23" Diameter Cylindrical Fuel Tank Changes. APPENDIX B \- Revised Allison 5th Gen New Modules and Definitions
- [SS3075\-FTL2021](/bulletins/10191149.md), 2021-05-01, Service bulletin: POWER TRAIN. Service Solution for FTL DT12 Trans Control Harness Chaffing \- PT Can faults. Transmission will not shift into Gear while driving or will not start and trigger multiple PT CAN Fault Codes.
- [D21M1](/bulletins/10191143.md), 2021-05-01, Service bulletin: POWER TRAIN. Detroit Field Service Campaign for DT12 Transmission Drive Shaft Cover Plug Reseal. Daimler Trucks North America LLC, on behalf of its DETROIT Powertrain Division, is initiating Field Service Campaign D21M1 on certain DT12 transmissions in order to reseal the bypass plugs of the drive shaft cover located in front housing.
- [DT12 Trans Chafe](/bulletins/10190020.md), 2021-04-08, Service bulletin: EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; POWER TRAIN. DTNA received a field notification on multiple units regarding diagnostic fault codes that were found to be causing issues to the After Treatment Control Module \(ACM\). These fault codes indicated that the ACM communication message was not received by the Motor Control Module \(MCM\) which in certain cases, led to a 25% engine de\-rate situation. Further diagnosis revealed that the DT12 wiring harness was chafing and contacting the transmission TCU case. To reduce potential chafing areas, the proposed short\-term containment was to route the wiring harness using additional tie straps. This communication applies to Freightliner and Western Star vehicles built with DT12 transmissions.
- [TechTalk8084](/bulletins/10188134.md), 2021-03-04, Service bulletin: POWER TRAIN. Tech Talk continuing discussion on DT12 TRYING TO DOWN SHIFT.
- [TechTalk8000](/bulletins/10186533.md), 2021-02-02, Service bulletin: ENGINE AND ENGINE COOLING; POWER TRAIN. Tech Talk discussion on Cascadia Engine Brakes Not working.
- [Techtalk8000](/bulletins/10184877.md), 2021-01-03, Service bulletin: ENGINE AND ENGINE COOLING; POWER TRAIN. Tech Talk discussion on Cascadia Engine Brakes Not working.

JSON: [/v1/bulletins/10182115](/v1/bulletins/10182115)

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