2021 Audi Models Seat Belt and Pre Sense Warning DTC B101C07
Audi has issued Technical Service Bulletin 2056421/3 addressing sporadic seat belt and Pre Sense warnings, often accompanied by DTC B101C07, in certain 2021 Audi models. This bulletin clarifies that the issue is typically not a defective part but rather related to how the seat belt latch switch…
Ahmet Topcu2021 Audi e-tron
Si applica anche a
- Audi A6
- 2021
- Audi A7
- 2021
- Audi Q7
- 2021
- Audi Q8
- 2021
Owners of certain 2021 Audi models may encounter sporadic seat belt or Pre Sense warnings while driving. These warnings are often accompanied by a diagnostic trouble code (DTC) B101C07 stored in the airbag control module. This article explains the cause of this issue, as detailed in Audi's Technical Service Bulletin (TSB) 2056421/3, and what steps can be taken to resolve it.
Symptoms
If your 2021 Audi is affected, you might observe one or both of the following symptoms:
- A seat belt warning appearing sporadically in the driver information system (DIS).
- A Pre Sense warning appearing sporadically in the driver information system (DIS).
These warnings typically occur while the vehicle is in motion.
Fault codes / DTCs
When these symptoms are present, a diagnostic scan will likely reveal the following fault code stored in the airbag control module/safety computer (J234):
| Code | Description | Module |
|---|---|---|
| B101C07 | Driver seat belt switch mechanical malfunction | Airbag control module/safety computer (J234) |
What the service bulletin says
Audi's TSB 2056421/3 explains that the safety computer continuously monitors the status of the seat belt latch switch (E24). If the system detects a constant signal from the switch over five drive cycles—which can happen if a seat belt extender, a
Frequently Asked Questions
- What does DTC B101C07 mean in my Audi?
- DTC B101C07 indicates a "Driver seat belt switch mechanical malfunction" detected by the airbag control module/safety computer (J234). This code is often triggered by how the seat belt latch switch (E24) is used, rather than a true component failure.
- Can a seat belt extender cause the Pre Sense warning?
- Yes, the TSB states that using a seat belt extender, a "cheat device," or continuously leaving the seat belt buckled can cause the system to incorrectly trigger the Pre Sense warning and store DTC B101C07. The system interprets the constant signal as a malfunction.
- How can I clear the B101C07 fault code and warning?
- If diagnostic tests confirm the seat belt latch switch (E24) is not defective, performing one complete drive cycle that includes both latching and unlatching the seat belt is often sufficient to clear the DTC B101C07 and turn off the Pre Sense warning in the instrument cluster.
- Will replacing parts fix the Audi e-tron B101C07 issue?
- According to the TSB, parts replacement typically does not solve this issue. The problem is usually related to the usage pattern of the seat belt latch switch, not a faulty component. Claims for replaced parts may be subject to review.
Altre revisioni di questo TSB
- 2025 Audi S3 'Vehicle Electronics: Fault' TSB 2076134/3B101C07
- 2025 Audi A3 / S3 'Vehicle electronics: fault' TSBB101C07
- 2025 Audi A3 / S3 'Vehicle electronics: fault' TSBB101C07
- 2019-2025 Audi Seat Belt and Pre Sense Warning TSBB101C07
- 2022-2024 Audi Seat Belt Warning DTC B101C07 TSBB101C07
- 2021-2023 Audi Seat Belt or Pre Sense Warning TSBB101C07
- 2021-2023 Audi e-tron B101C07 Airbag Control Module TSBB101C07
- 2021-2023 Audi B101C07 Seat Belt Warning TSBB101C07
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