Audi B131D29
theft warning system, implausible signal 267032 passive/sporadic B163002 Predictive route data signal error 9371914 passive/intermittent or active/static Technical Service Bulletin
Quick answer
For US-market 2022–2023 Audi Q4 e-tron vehicles, B131D29 is documented in an Audi Technical Service Bulletin as: “Sirens / alarm horn for anti-theft warning system, implausible signal.” The bulletin states it may be found during pre-delivery inspection (PDI) or other diagnostic work with no customer concerns reported.
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 B131D29 mean?
For US-market 2022–2023 Audi Q4 e-tron vehicles, B131D29 is documented in an Audi Technical Service Bulletin as: “Sirens / alarm horn for anti-theft warning system, implausible signal.” The bulletin states it may be found during pre-delivery inspection (PDI) or other diagnostic work with no customer concerns reported.
2. Technical explanation
Verified NHTSA-hosted Audi manufacturer communication 10218677 (published August 23, 2022) lists B131D29 with symptom number 267032 and a passive/sporadic status. The supplied evidence identifies the involved component as the sirens/alarm horn for the anti-theft warning system and characterizes the fault as an implausible signal. The supplied excerpt also lists other DTCs in the same bulletin, but does not establish that they are caused by B131D29 or that they must occur together.
3. What system is affected?
Anti-theft warning system; specifically, the sirens/alarm horn for that system.
4. How serious is this code?
Unknown. The verified evidence does not provide a severity rating or describe a safety consequence.
5. Symptoms you may notice
- No customer concerns were reported in the verified bulletin scenario.
- The code may be found during PDI or other diagnostic work.
- B131D29 may be stored as passive/sporadic.
6. Possible causes
- An implausible signal involving the sirens/alarm horn for the anti-theft warning system is verified.
- The underlying cause of that implausible signal is not yet 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
- Record the exact DTC, its status, and the diagnostic address before clearing codes.
- Have an Audi-qualified service facility evaluate the vehicle using applicable Audi diagnostic information.
- Do not attempt high-voltage repairs; no high-voltage repair procedure is established by the supplied evidence.
10. Step-by-step troubleshooting
- Confirm whether B131D29 is present and whether its status is passive/sporadic.
- Review the applicable Audi Technical Service Bulletin and follow its documented diagnostic process. The supplied excerpt does not include that process.
- No further troubleshooting steps are established by the supplied verified evidence.
11. When to contact service
Contact an Audi dealer or qualified Audi service facility if the code remains present, returns after clearing, or if an anti-theft warning-system concern is observed. The need for service is not otherwise established by the supplied evidence.
12. What the service center may check
- Check for B131D29 in the applicable diagnostic address and document its stored status.
- Review Audi manufacturer communication 10218677 for the vehicle’s applicability and complete procedure.
- Additional service checks are not yet established by the supplied evidence.
13. Possible repair or resolution
- A specific repair or resolution is not included in the supplied verified evidence.
- Do not replace parts based solely on this code and the supplied excerpt.
14. Affected vehicles
- Audi Q4 e-tron · 2022–2023 · US
15. Related TSBs / service bulletins
- Audi Technical Service Bulletin / NHTSA Manufacturer Communication 10218677, document A0022592067842_1, published August 23, 2022. It applies in the supplied applicability data to US-market 2022–2023 Audi Q4 e-tron vehicles and lists B131D29 as a possible stored DTC, including during PDI or other diagnostic work with no customer concerns.
16. Recall information
- No recall is established by the supplied verified evidence.
17. Official manufacturer information
Official source: NHTSA-hosted Audi manufacturer communication PDF 10218677: https://static.nhtsa.gov/odi/tsbs/2022/MC-10218677-0001.pdf
19. Frequently asked questions
What does Audi code B131D29 mean?
In the verified Audi bulletin, it means “Sirens / alarm horn for anti-theft warning system, implausible signal.”
Can B131D29 appear without a customer-visible problem?
Yes. The verified bulletin states that there may be no customer concerns and that the code can be found during PDI or other diagnostic work.
Is B131D29 confirmed to prevent driving or charging?
Not yet established by verified evidence.
Does B131D29 prove that the alarm horn or siren must be replaced?
No. A replacement requirement is not established by the supplied verified evidence.