Audi A4 2017–2021 — technical service bulletin
Bulletin A3921452048671_5 · NHTSA communication 10203591 · issued Nov 12, 2021
Technical service bulletin
communication type
Electrical System
component
2017–2021
model years
23
vehicle entries
Official summary
This bulletin contains instructions for when DTC U030000 appears and à ¢à  à  All Wheel Drive Malfunction Messageà ¢à  à  is displayed in the instrument cluster.
Vehicles covered
- 2017 Audi A4
- 2018 Audi A4
- 2019 Audi A4
- 2020 Audi A4
- 2021 Audi A4
- 2018 Audi A5
- 2019 Audi A5
- 2020 Audi A5
- 2021 Audi A5
- 2019 Audi A6
- 2020 Audi A6
- 2021 Audi A6
- 2019 Audi A7
- 2020 Audi A7
- 2021 Audi A7
- 2017 Audi Allroad
- 2018 Audi Allroad
- 2019 Audi Allroad
- 2020 Audi Allroad
- 2021 Audi Allroad
- 2019 Audi Q5
- 2020 Audi Q5
- 2021 Audi Q5
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.