# Service bulletin D20M2

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: 10182137
- Published by NHTSA: 2020\-11\-04
- Manufacturer's number: D20M2
- Manufacturer's date: 2020\-10\-29
- NHTSA component: POWER TRAIN; EQUIPMENT; ENGINE AND ENGINE COOLING

## NHTSA's summary

Detroit Diesel Field Service Campaign for DETROIT TM2020 Transmission Replacement. It has been discovered that certain TM2020 units have porosity issues in and around the oil cooler line fittings on the center housing.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10182137-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10182137-9999.pdf)

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

## Components

Engine, Equipment and accessories, Transmission and driveline

## Vehicles listed

- 2020 FREIGHTLINER CASCADIA
- 2020 WESTERN STAR 5700

## Recalls for the same vehicles and component

- [22V338000](/recalls/nhtsa/22V338000.md), 2022-05-16: EQUIPMENT:OTHER:LABELS
- [19V137000](/recalls/nhtsa/19V137000.md), 2019-02-27: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION \(PRNDL\)

## Other bulletins for the same vehicles and component

- [TSB\-26\-057\-FTL](/bulletins/11033103.md), 2026-06-01, Service bulletin: POWER TRAIN. Revised Technical Service Bulletin for DT12 OVX Transmission Refresh
- [TSB\-26\-055\-FTL](/bulletins/11028073.md), 2026-02-03, Service bulletin: POWER TRAIN. Revised Technical Service Bulletin for DT12 Excessive Wear
- [TSB\-26\-055\-FTL](/bulletins/11028063.md), 2026-02-03, Service bulletin: POWER TRAIN. Technical Service Bulletin for DT12 Excessive Wear
- [TSB\-26\-052\-FTL](/bulletins/11028062.md), 2026-02-03, Service bulletin: POWER TRAIN. Technical Service Bulletin for DT12 PTO Upfit
- [FleetCom\_Passive Lube](/bulletins/11027502.md), 2026-01-08, Other: POWER TRAIN. Fleet Communications for Detroit Axle NFD ALM to Passive Lube Management
- [FleetCom\_Oil Plug Loc](/bulletins/11027500.md), 2026-01-08, Other: POWER TRAIN. Fleet Communications for NFD Lower Oil Plug Location \- SP Axles
- [FleetCom\_NFD Axle](/bulletins/11027497.md), 2026-01-08, Other: POWER TRAIN. Fleet Communications for Detroit NFD Axle \- Factory Fluid Change
- [FleetCom\_Heater Core](/bulletins/11027493.md), 2026-01-08, Other: ENGINE. Fleet Communications for Heater Core Plugging
- [FleetCom\_SS 3163\-FTL](/bulletins/11026453.md), 2025-12-06, Other: ENGINE. Fleet Communications for Power Steering Reservoir Fill Cap Venting
- [FleetCom\_Low Coolant](/bulletins/11026421.md), 2025-12-05, Other: ENGINE. Fleet Communications for Low Coolant Sensor

JSON: [/v1/bulletins/10182137](/v1/bulletins/10182137)

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