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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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11005891
Published by NHTSA2024-08-06
Manufacturer's numberA4524452072977_3
Manufacturer's date2024-07-31
NHTSA componentSERVICE 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

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

Brakes

Trouble codes named

U0121

Vehicles listed
AUDI E-TRON2019
AUDI E-TRON2021, 2022, 2023
AUDI E-TRON SPORTBACK2020, 2021, 2022
AUDI E-TRON SPORTBACK2023 (the catalog's model; the bulletin names a series or trim of it)
AUDI Q8 E-TRON2024 to 2025
AUDI Q8 SPORTBACK E-TRON2024 to 2025
AUDI SQ8 E-TRON2024, 2025 (the catalog's model; the bulletin names a series or trim of it)
AUDI SQ8 SPORTBACK E-TRON2024 (the catalog's model; the bulletin names a series or trim of it)

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

Recalls for the same vehicles and component
20261872026-04-15. Brakes
26V2400002026-04-15. SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES
20246702024-11-04. Brakes
20244842024-08-19. Brakes
24V6210002024-08-19. SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES
21V7070002021-09-13. SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP; SERVICE BRAKES, HYDRAULIC
21V5690002021-07-26. SERVICE BRAKES, HYDRAULIC

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
TSB_2077435_32026-09-04. Service bulletin. This bulletin provides information when there are cracks on the friction ring surface on ceramic brake discs.
TSB_2075120_32026-09-04. Service bulletin. This bulletin provides information about the general approach for brake vibration concerns.
TSB_2072304_42026-09-04. Service bulletin. This bulletin provides information when there is an ABS/ESC speed sensor implausible signal.
TSB_2069904_32026-09-04. Service bulletin. This bulletin provides information for all models regarding brake sounds.
TSB_2069078_42026-09-04. Service bulletin. This bulletin provides information on the zirconium insercts in the brake piston (ceramic brakes only).
TSB_2067132_42026-09-04. Service bulletin. This bulletin provides information when there is corrosion on the friction survace of steel brake discs.
TSB_2077435_22025-11-08. Service bulletin. This bulletin provides information when there are cracks on the friction ring surface on ceramic brake discs.
TSB_2069904_22025-11-08. Service bulletin. This bulletin provides information for all models regarding brake sounds.
TSB_2075120_22025-11-08. Service bulletin. This bulletin provides information regarding the general approach for all Audi vehicles regarding brake vibrations.
TSB_2072304_32025-11-08. Service bulletin. This bulletin provides information when there is an ABS/ESC speed sensor implausible signal.