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Service bulletin A911807 2052251-

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 id10150753
Published by NHTSA2018-12-10
Manufacturer's numberA911807 2052251-
Manufacturer's date2018-08-24
NHTSA componentELECTRICAL SYSTEM:SOFTWARE; STRUCTURE:BODY:DOOR

NHTSA's summary

This bulletin contains software update instructions for when the audio is distorted from door speakers or subwoofer.

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

Body and frame, Electrical system, Software

Vehicles listed
AUDI A4 ALLROAD2017, 2018
AUDI A52018

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

Recalls for the same vehicles and component
16V6420002016-09-06. ELECTRICAL SYSTEM:SOFTWARE; EXTERIOR LIGHTING

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
A0023822047812_72024-01-04. Service bulletin. This bulletin provides information on how to set up and use the SD Creator for obtaining vehicle software updates via the Mirror Server.
A7222442048311_62022-07-01. Service bulletin. This bulletin contains a software update to correct an intermittently inoperative seat belt positioner.
A4622332051095_72022-07-01. Service bulletin. This informational bulletin contains instructions on how to download and use the Audi Frequency App.
DC_91CD_Train2022-03-04. Service bulletin. 3G Turndown (91CD) Dealer Training
Dealer 91CD2022-02-04. Service bulletin. AT&T has announced its plan to discontinue its 3G network in the U.S. starting in February 2022. This will impact the Audi connect services in certain 2017-2019 model year Audi vehicles.
A0021552011732122022-01-05. Service bulletin. This bulletin contains general instructions for software updates.
A9621712051239_22021-08-04. Service bulletin. This bulletin contain instructions for addressing issues with the garage door remote and HomeLink.
A9121072060681_32021-07-02. Service bulletin. This bulletin contains instructions to update eligible cars from Google Earth to the new service provided by HERE.
A4321482059665_22021-07-02. Service bulletin. This bulletin contains a software update that corrects the control module configuration and addresses a warning light.
A9121982055591_52021-06-03. Service bulletin. This bulletin contains a software update for when the MMI screens go blank and the system reboots, it may have stored DTC U10CF00 and/or B13B901.