# Service bulletin A4524452072977\_3

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: 11005891
- Published by NHTSA: 2024\-08\-06
- Manufacturer's number: A4524452072977\_3
- Manufacturer's date: 2024\-07\-31
- NHTSA component: SERVICE BRAKES

## NHTSA's summary

This bulletin provide sinformation when the ABS/ESC Control unit cannot be reached; DTC U012100 "ABS Control Module no communication."

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11005891-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11005891-9999.pdf)

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

## Components

Brakes

## Trouble codes named

U0121

## Vehicles listed

- 2019 AUDI E\-TRON
- 2021 to 2023 AUDI E\-TRON
- 2020 to 2022 AUDI E\-TRON SPORTBACK
- 2023 AUDI E\-TRON SPORTBACK
- 2024 to 2025 AUDI Q8 E\-TRON
- 2024 to 2025 AUDI Q8 SPORTBACK E\-TRON
- 2024 to 2025 AUDI SQ8 E\-TRON
- 2024 AUDI SQ8 SPORTBACK E\-TRON

## Recalls for the same vehicles and component

- [2026187](/recalls/tc/2026187.md), 2026-04-15: Brakes
- [26V240000](/recalls/nhtsa/26V240000.md), 2026-04-15: SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES
- [2024670](/recalls/tc/2024670.md), 2024-11-04: Brakes
- [2024484](/recalls/tc/2024484.md), 2024-08-19: Brakes
- [24V621000](/recalls/nhtsa/24V621000.md), 2024-08-19: SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES
- [21V707000](/recalls/nhtsa/21V707000.md), 2021-09-13: SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP; SERVICE BRAKES, HYDRAULIC
- [21V569000](/recalls/nhtsa/21V569000.md), 2021-07-26: SERVICE BRAKES, HYDRAULIC

## Other bulletins for the same vehicles and component

- [TSB\_2077435\_3](/bulletins/11036924.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information when there are cracks on the friction ring surface on ceramic brake discs.
- [TSB\_2075120\_3](/bulletins/11036921.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information about the general approach for brake vibration concerns.
- [TSB\_2072304\_4](/bulletins/11036914.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information when there is an ABS/ESC speed sensor implausible signal.
- [TSB\_2069904\_3](/bulletins/11036911.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information for all models regarding brake sounds.
- [TSB\_2069078\_4](/bulletins/11036909.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information on the zirconium insercts in the brake piston \(ceramic brakes only\).
- [TSB\_2067132\_4](/bulletins/11036906.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information when there is corrosion on the friction survace of steel brake discs.
- [TSB\_2077435\_2](/bulletins/11025404.md), 2025-11-08, Service bulletin: SERVICE BRAKES. This bulletin provides information when there are cracks on the friction ring surface on ceramic brake discs.
- [TSB\_2069904\_2](/bulletins/11025369.md), 2025-11-08, Service bulletin: SERVICE BRAKES. This bulletin provides information for all models regarding brake sounds.
- [TSB\_2075120\_2](/bulletins/11025342.md), 2025-11-08, Service bulletin: SERVICE BRAKES. This bulletin provides information regarding the general approach for all Audi vehicles regarding brake vibrations.
- [TSB\_2072304\_3](/bulletins/11025336.md), 2025-11-08, Service bulletin: SERVICE BRAKES. This bulletin provides information when there is an ABS/ESC speed sensor implausible signal.

JSON: [/v1/bulletins/11005891](/v1/bulletins/11005891)

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