# U1421 on the 2020 Audi A4

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.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name U1421

- [11016511](https://open.wenmarpro.com/bulletins/11016511), 2025-04-04: This bulletin provides information when there is an SOS Malfunction with ConBox Low, "Emergency call function: fault", \(DTC U142100, U153E00\).
- [11009387](https://open.wenmarpro.com/bulletins/11009387), 2024-10-28: This bulletin provides information when there is an SOS Malfunction with ConBox Low, "Emergency call function: fault", \(DTC U142100, U153E00\).
- [10246194](https://open.wenmarpro.com/bulletins/10246194), 2023-12-06: This bulletin provides information when there is no diagnostics communication to the telematics control module in vehicles with ConBox low; DTC U142100.
- [10214842](https://open.wenmarpro.com/bulletins/10214842), 2022-07-01: This bulletin contains repair instructions for proper transport mode deactivation \(DTC U142100, DTC P169A00, and U13EB00 \).
- [10208481](https://open.wenmarpro.com/bulletins/10208481), 2022-03-04: This bulletin contains repair instructions for proper transport mode deactivation \(DTC U142100, DTC P169A00, and U13EB00 \).