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U0101 on the 2025 Audi A3

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 U0101
TSB_2074475_42025-07-08. Service bulletin. This TSB provides information when DTC U010100 is stored; Lost Communication with TCM in diagnostic address 23.
TSB-2074475_32025-03-19. Service bulletin. This bulletin provides information when DTC U010100 , Lost Communication with TCM in diagnostic address 23 occurs.
A4724302074475_22024-08-06. Service bulletin. This bulletin provides information when DTC U010100 , Lost Communication with TCM in diagnostic address 23 occurs.

3 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.