2021 Audi e-tron Parking Brake Warning TSB
Audi has issued Technical Service Bulletin 2061906/1 for the 2021 Audi e-tron to address a parking brake warning and DTC U103100. This TSB outlines a software update for the ABS control module to resolve sporadic "Parking brake fault" messages in the instrument cluster.
Owners of the 2021 Audi e-tron may experience a sporadic Audi e-tron parking brake warning in the instrument cluster when starting their vehicle. This warning is typically accompanied by the text "Parking brake fault" and indicates a potential issue with the electronic parking brake system.
Symptoms
If your 2021 Audi e-tron is affected, you may observe the following symptoms:
- A warning lamp for the electronic parking brake briefly illuminates in the instrument cluster.
- The text message "Parking brake fault" appears on the display.
- These symptoms primarily occur when starting the vehicle.
Fault Codes / DTCs
When diagnosing this issue, technicians may find the following Diagnostic Trouble Code (DTC) stored sporadically in the ABS control module, identified as J104 (address word 0003):
| Code | Description | Module |
|---|---|---|
| U103100 | FlexRay data bus, no synchronization | ABS Control Module |
Technical Background
The root cause of the Audi e-tron parking brake warning and DTC U103100 is outdated software within the Anti-lock Braking System (ABS) control module. An updated software version has been implemented in production to prevent this condition in newer vehicles.
Repair Procedure Summary
To resolve the parking brake warning and DTC U103100, Audi dealerships will perform a software update on the affected control modules. The procedure involves the following steps:
- Software Version Management (SVM) Update: Technicians will follow the instructions detailed in TSB 2011732, specifically the 00 Software Version Management (SVM) operating instructions.
- Module Updates: The ABS control module (J104, address word 0003) and the suspension control module (J775, address word 0074) will be updated using the SVM action code 74A006.
- Basic Settings: After the software update, basic settings for the electromechanical parking brake and the tire pressure monitoring system must be performed.
- Post-Update Check: If the DTC U103100 persists in the ABS control module (J104) after the update, additional steps are required. This includes locking the vehicle, waiting for sleep bus mode to activate, reading the ABS memory log, deleting any remaining DTCs, and reevaluating the vehicle.
Required Software and Part Numbers
The software update involves specific part numbers and software versions for the ABS and suspension control modules:
| Control Module | Old Software Part Number | Old Software Version | New Software Part Number (or higher) | New Software Version (or higher) |
|---|---|---|---|---|
| ABS (J104) | 4KE909059AD | 0231 | 4KE909059AF | 0242 |
| Suspension (J775) | 4KE907777AM | <2320 | 4KE907777AH | 2320 |
Owner Action
If your 2021 Audi e-tron displays a Audi e-tron parking brake warning or the "Parking brake fault" message, it is recommended to schedule an appointment with an authorized Audi service center. The software update is typically covered under warranty for vehicles up to 48 months or 50,000 miles, whichever comes first. Certified Pre-Owned (CPO) vehicles may also be covered. If your vehicle is outside of warranty, this Technical Service Bulletin serves as informational guidance.
Frequently Asked Questions
- What causes the Audi e-tron parking brake warning?
- The Audi e-tron parking brake warning, often accompanied by a "Parking brake fault" message and DTC U103100, is caused by outdated software in the ABS control module. A software update is required to resolve this.
- What does DTC U103100 mean for my Audi e-tron?
- DTC U103100 in your Audi e-tron indicates a "FlexRay data bus, no synchronization" issue, typically stored in the ABS control module (J104). This fault code is linked to the sporadic parking brake warning.
- How is the Audi e-tron parking brake warning fixed?
- The issue is fixed by updating the software in the ABS control module (J104) and suspension control module (J775) using SVM action code 74A006, as detailed in TSB 2061906/1. This procedure also includes performing basic settings for the parking brake and tire pressure monitoring system.
- Is the repair for the Audi e-tron parking brake warning covered by warranty?
- Yes, the software update to address the Audi e-tron parking brake warning is generally covered under Audi's new vehicle limited warranty (up to 48 months/50,000 miles) and for Certified Pre-Owned (CPO) vehicles. It is recommended to check with your Audi dealer for specific coverage details.
Altre revisioni di questo TSB
What Audi e-tron owners report
Counted from the records in our database across 5 model years.
- 158
- Owner complaints
- 14
- Recalls
- 1,706
- Service bulletins
- 7
- Crashes reported
- 6
- Fires reported
- 3
- Injuries reported
The 2021 model year
36 complaints, the 2nd most of 5 model years on file. Owners reported 0 crashes, 1 fire and 0 injuries for this year, which also has 10 recalls on file.
Service Brakes and Parking Brake, the system this article covers, accounts for 18 of 158 complaints (11%), including 3 for 2021.
Complaints by model year
| 2019 | 84 | |
|---|---|---|
| 2020 | 1 | |
| 2021 | 36 | |
| 2022 | 31 | |
| 2023 | 6 |
Most-reported systems
- Electrical System — 81
- Power Train — 24
- Engine — 23
- Fuel/Propulsion System — 18
- Service Brakes — 18
Latest recalls for the 2021 model year
- 26V240000 — Service Brakes, Hydraulic (Apr 2026)
- 25V900000 — Back Over Prevention (Dec 2025)
- 23V867000 — Electrical System (Dec 2023)
Recent owner reports about service brakes and parking brake
Moisture build-up in the high-voltage electrical system through a faulty seal on the charging socket, which can cause a short circuit and significantly increase the risk of a vehicle fire.
Read owner complaints →On five separate occasions across two separate drivers, we have experienced a partial brake failure in this vehicle. We strongly believe this to be a software defect and not a mechanical fault.
Complaints are owner reports filed with NHTSA. They are unverified, and counts depend on how many vehicles were sold, so they are not a failure rate.
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