# Service bulletin Circular24GBREV1

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: 10181978
- Published by NHTSA: 2020\-11\-05
- Manufacturer's number: Circular24GBREV1
- Manufacturer's date: 2020\-10\-29
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE; ELECTRICAL SYSTEM:SOFTWARE

## NHTSA's summary

Volkswagen is providing an Engine and Transmission Control Module \(ECM/TCM\) software update to address elevated tailpipe emissions that were found during vehicle testing. This software will also improve drivability and provide other diagnostic improvements. Update to vehicle count and updated claiming instructions due to additional criteria X4.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181978-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181978-9999.pdf)

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

## Components

Electrical system, Engine, Exhaust and emissions, Exhaust manifold, pipes and muffler, Software

## Vehicles listed

- 2018 to 2020 VOLKSWAGEN TIGUAN

## Other bulletins for the same vehicles and component

- [TT 91 24 01](/bulletins/10249136.md), 2024-02-06, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Addressing Cybersecurity or Vehicle Hack concerns
- [VOS\-23\-21](/bulletins/10238400.md), 2023-07-10, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. This communication is a notice for software changes with the ODIS program for specific cars.
- [VCarNetCE](/bulletins/10238302.md), 2023-07-10, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Notifying customers they can take advantage of complimentary safe and secure after their complimentary software update
- [V011812201460319](/bulletins/10238301.md), 2023-07-10, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Software Version Management \(SVM\) instruction.
- [VOS\-23\-14](/bulletins/10238206.md), 2023-07-10, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:SOFTWARE. This communication is a notice for software changes with the ODIS program for specific cars
- [VOS1603](/bulletins/10213875.md), 2022-06-13, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM:SOFTWARE. Release Notes Supplement.
- [VOS1602](/bulletins/10213874.md), 2022-06-13, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; UNKNOWN OR OTHER. Mandatory Installation from Web\-Server.
- [VOS1601](/bulletins/10213873.md), 2022-06-13, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM:SOFTWARE. Mandatory Installation from Web\-Server.
- [A002155201173212](/bulletins/10204722.md), 2022-01-05, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains general instructions for software updates.
- [V0019042054866\_4](/bulletins/10200454.md), 2021-09-02, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL. SD creator instruction, updated to include model year 2022.

JSON: [/v1/bulletins/10181978](/v1/bulletins/10181978)

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