Audi U103100
00 Software Version Management (SVM), operating instructions. 2. Update the ABS control
Quick answer
For certain US Audi e-tron and e-tron Sportback vehicles, DTC U103100 may be stored sporadically in the ABS control module and is addressed by an ABS control-module software update.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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1. What does U103100 mean?
For certain US Audi e-tron and e-tron Sportback vehicles, DTC U103100 may be stored sporadically in the ABS control module and is addressed by an ABS control-module software update.
2. Technical explanation
Audi’s manufacturer communication identifies U103100 as “FlexRay data bus, no synchronization” when stored in ABS control module J104 (address word 0003). The documented technical background is that ABS control-module software needs to be updated. Audi states that updated software was introduced into production.
3. What system is affected?
ABS control module J104 (address word 0003).
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- When starting the vehicle, the electronic parking-brake warning lamp may briefly appear with the message “Parking brake fault.”
- U103100 may be stored sporadically in the ABS control module.
6. Possible causes
- Verified evidence identifies an ABS control-module software update as the documented correction. A separate underlying hardware cause is not established by verified evidence.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- If the electronic parking-brake warning and “Parking brake fault” message occur, arrange diagnosis by an Audi service provider.
- Provide the stored DTC and the warning-message details to the service provider.
10. Step-by-step troubleshooting
- A service provider can check ABS control module J104 (address word 0003) for sporadic DTC U103100.
- Audi’s documented service direction is to follow TSB 2011732, “00 Software Version Management (SVM), operating instructions,” and update the ABS control module.
11. When to contact service
Contact an Audi service provider for diagnosis and, where applicable, the ABS control-module software update.
12. What the service center may check
- Check ABS control module J104, address word 0003, for DTC U103100.
- Follow TSB 2011732 SVM operating instructions.
- Update the ABS control module as directed by Audi’s manufacturer communication.
13. Possible repair or resolution
- Update the ABS control-module software using Audi’s specified SVM process.
14. Affected vehicles
- Audi e-tron · 2019–2021 · US
- Audi e-tron · 2020–2022 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication 10185657, published January 15, 2021: applies to 2020–2021 Audi e-tron Sportback vehicles and documents sporadic U103100 in ABS control module J104, a brief electronic parking-brake warning/message at startup, and an ABS software update.
- NHTSA Manufacturer Communication 10198482, published June 25, 2021: revised communication documenting sporadic U103100 in ABS control module J104 and the need for an ABS software update.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official NHTSA-hosted Audi manufacturer communications: https://static.nhtsa.gov/odi/tsbs/2021/MC-10185657-0001.pdf and https://static.nhtsa.gov/odi/tsbs/2021/MC-10198482-0001.pdf
19. Frequently asked questions
What does U103100 mean in the cited Audi communication?
It is identified as “FlexRay data bus, no synchronization” when stored in ABS control module J104 (address word 0003).
What warning may occur with U103100?
The cited communication states that, when starting the vehicle, the electronic parking-brake warning lamp may briefly appear with “Parking brake fault.”
What is Audi’s documented repair direction?
Follow TSB 2011732 SVM operating instructions and update the ABS control module.
Which vehicles are supported by the supplied applicability evidence?
The supplied applicability records identify US Audi e-tron model years 2019–2021 and 2020–2022. The supplied January 2021 manufacturer communication specifically identifies 2020–2021 Audi e-tron Sportback vehicles.