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Service bulletin TT 91 20 04

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10173857
Published by NHTSA2020-05-07
Manufacturer's numberTT 91 20 04
Manufacturer's date2020-04-10
NHTSA componentELECTRICAL SYSTEM:SOFTWARE

NHTSA's summary

Car-Net OCU information.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Software

Vehicles listed
VOLKSWAGEN ARTEON2020, 2021
VOLKSWAGEN ATLAS2020, 2021
VOLKSWAGEN GOLF2020, 2021
VOLKSWAGEN GOLF R2020
VOLKSWAGEN GOLF R2021 (the catalog's model; the bulletin names a series or trim of it)
VOLKSWAGEN GTI2020
VOLKSWAGEN JETTA2020, 2021
VOLKSWAGEN PASSAT2021
VOLKSWAGEN TIGUAN2020, 2021

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
TT 91 24 012024-02-06. Service bulletin. Addressing Cybersecurity or Vehicle Hack concerns
VOS-23-212023-07-10. Service bulletin. This communication is a notice for software changes with the ODIS program for specific cars.
VCarNetCE2023-07-10. Service bulletin. Notifying customers they can take advantage of complimentary safe and secure after their complimentary software update
V0118122014603192023-07-10. Service bulletin. Software Version Management (SVM) instruction.
VOS-23-142023-07-10. Service bulletin. This communication is a notice for software changes with the ODIS program for specific cars
VOS-22-272022-07-01. Service bulletin. This document outlines updates to the ODIS diagnostic software. Updates include corrected diagnostic test plans for the stated vehicles.
VOS16032022-06-13. Service bulletin. Release Notes Supplement.
VOS16022022-06-13. Service bulletin. Mandatory Installation from Web-Server.
VOS16012022-06-13. Service bulletin. Mandatory Installation from Web-Server.
Dealer 91DE2022-04-06. Service bulletin. SERV_ACT - Connected Services (OCU3 High Module) Software Update