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U0121 on the 2022 Audi e-tron Sportback

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

Bulletins for this model year that name U0121
A4524452072977_32024-08-06. Service bulletin. This bulletin provide sinformation when the ABS/ESC Control unit cannot be reached; DTC U012100 "ABS Control Module no communication."
A4524412073483_12024-04-04. Service bulletin. This bulletin provides information when the ABS/ESC control unit cannot be reached "DTC U012100 - ABS Control module no communication" is stored.
A4524402072977_22024-04-04. Service bulletin. This bulletin provides information when the ABS/ESC control unit cannot be reached, DTC U012100, ABS Control Module not communication.
A4524392072977_12024-03-06. Service bulletin. This bulletin provides information when the ABS/ESC Control unit cannot be reached; DTC U012100, ABS Control Module no communication is stored.

4 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.