# Service bulletin 21\-021\-20

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: 10174236
- Published by NHTSA: 2020\-04\-27
- Manufacturer's number: 21\-021\-20
- Manufacturer's date: 2020\-03\-20
- NHTSA component: ELECTRICAL SYSTEM; POWER TRAIN

## NHTSA's summary

Flash: Transmission Control Module \(TCM\) Updates This bulletin involves reprogramming the TCM with the latest available software. The customer may notice the following condition:A loud whistle noise upon engine start up. Rough and/or erratic shifting between gears during normal drive cycles.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10174236-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10174236-9999.pdf)

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

## Components

Electrical system, Transmission and driveline

## Vehicles listed

- 2020 DODGE DURANGO

## Other bulletins for the same vehicles and component

- [S2621000004](/bulletins/11038329.md), 2026-10-07, Service bulletin: POWER TRAIN. The Customer May Complain About a Popping Noise, Grinding Noise, or an Intermittent No Reverse or Forward Transmission Engagement. The Tech May Find Damaged and/or Worn Transmission Output Shaft Splines \(850RE Transmission Only\)
- [114738](/bulletins/11037594.md), 2026-09-30, Service bulletin: POWER TRAIN. TRANSMISSION KIT \- WITH TORQUE CONVERTER
- [114737](/bulletins/11037593.md), 2026-09-30, Service bulletin: POWER TRAIN. TRANSMISSION KIT \- WITH TORQUE CONVERTER
- [9100900](/bulletins/11037346.md), 2026-09-17, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. Passive Entry O/S Dr Handle Prior to replacing an inoperative passive entry door handle, perform Star Online S2623000040.
- [S2623000041 REV.A](/bulletins/11034351.md), 2026-07-02, Service bulletin: STRUCTURE:BODY; ELECTRICAL SYSTEM. Power Liftgate Intermittently Inoperative. Will Not Open/ Close. Liftgate/Hatch Ajar Message Displayed. Rev A
- [S1623000028 Rev. K](/bulletins/11033975.md), 2026-06-18, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. Outside Power Fold Rearview Mirror Noise Or Loose At Pivot. Mirror Contacts Door Window Glass In The Folded Position.
- [9100835](/bulletins/11033957.md), 2026-06-18, Service bulletin: ELECTRICAL SYSTEM. Prior to replacing an inoperative passive entry door handle, perform Star Online S2623000040.
- [S2623000040](/bulletins/11033896.md), 2026-06-16, Service bulletin: STRUCTURE:BODY; ELECTRICAL SYSTEM. Passive Entry Exterior Door Handle Inoperative When Touched To Lock And Or Unlock.
- [S2623000041](/bulletins/11033895.md), 2026-06-16, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. Power Liftgate Intermittently Inoperative. Will Not Open/ Close. Liftgate/Hatch Ajar Message Displayed.
- [S1623000028 REV.I](/bulletins/11033308.md), 2026-06-03, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. Outside Power Fold Rearview Mirror Noise Or Loose At Pivot. Mirror Contacts Door Window Glass In The Folded Position.

JSON: [/v1/bulletins/10174236](/v1/bulletins/10174236)

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