# Service bulletin Circular \- 23AK

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: 10170275
- Published by NHTSA: 2020\-02\-07
- Manufacturer's number: Circular \- 23AK
- Manufacturer's date: 2020\-01\-07
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL; ELECTRICAL SYSTEM:SOFTWARE

## NHTSA's summary

Volkswagen is releasing a software calibration update to the Approved Emissions Modification \(AEM\). This software calibration will include the following changes to the vehicles emissions control and on\-board diagnostics \(OBD\) software: \(1\) It will correct an issue that is causing the 'check engine' light to falsely illuminate under certain driving conditions, which has resulted in replacement of the diesel oxidation catalyst \(DOC\) for certain customers; \(2\) It will reduce the likelihood of experiencing an engine shudder that could occur during certain warm\-up driving conditions; and \(3\) It will improve OBD monitoring of vehicle emissions systems and otherwise improve the software used by your vehicle.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10170275-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10170275-9999.pdf)

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

## Components

Electrical system, Engine, Exhaust and emissions, Software

## Vehicles listed

- 2013 to 2016 VOLKSWAGEN TOUAREG

## Other bulletins for the same vehicles and component

- [911406](/bulletins/10253194.md), 2024-04-15, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; UNKNOWN OR OTHER; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. RNS 850 Radio Software Update
- [TT 91 24 01](/bulletins/10249136.md), 2024-02-06, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Addressing Cybersecurity or Vehicle Hack concerns
- [TB011407](/bulletins/10241310.md), 2023-08-28, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; UNKNOWN OR OTHER. Software Version Management
- [Guide](/bulletins/10240605.md), 2023-08-14, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). P0102, P1128, P1296 \- WA front oxygen sensor faults
- [911406](/bulletins/10239571.md), 2023-07-24, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. RNS 850 Radio Software Update
- [911401](/bulletins/10239566.md), 2023-07-24, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. UMI Software Update for Various Bluetooth® 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.
- [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
- [VOS\-22\-27](/bulletins/10214810.md), 2022-07-01, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:SOFTWARE. This document outlines updates to the ODIS diagnostic software. Updates include corrected diagnostic test plans for the stated vehicles.

JSON: [/v1/bulletins/10170275](/v1/bulletins/10170275)

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