Audi A3 2020–2026 — technical service bulletin
Bulletin TSB_2074475_4 · NHTSA communication 11020376 · issued Jun 27, 2025
Technical service bulletin
communication type
Electrical System
component
2020–2026
model years
20
vehicle entries
Official summary
This TSB provides information when DTC U010100 is stored; Lost Communication with TCM in diagnostic address 23.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.