Audi B129C11
43 dated December 9, 2020 for reasons listed below. Model(s) Year VIN Range Vehicle-Specific Equipment A4, S4, A4 allroad, A5, A5 Cabriolet, A5 Sportback, S5, S5 Cabriolet, and S5
Quick answer
For Audi, verified NHTSA-hosted manufacturer communications identify DTC B129C11, together with B129B11, as being stored in emergency call control module 91 in connection with an SOS emergency-call malfunction. The supplied evidence does not establish a standalone plain-language definition for B129C11.
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 B129C11 mean?
For Audi, verified NHTSA-hosted manufacturer communications identify DTC B129C11, together with B129B11, as being stored in emergency call control module 91 in connection with an SOS emergency-call malfunction. The supplied evidence does not establish a standalone plain-language definition for B129C11.
2. Technical explanation
Audi Technical Service Bulletin/PSS material hosted by NHTSA states: “SOS emergency call malfunction, DTC B129B11 and B129C11 are stored in the emergency call control module.” The newer verified communication is dated November 3, 2021 and supersedes an earlier February 17, 2021 bulletin; that earlier bulletin superseded a December 9, 2020 bulletin. No further diagnostic logic, root cause, repair procedure, or code definition is established by the supplied evidence.
3. What system is affected?
Emergency call control module 91 / SOS emergency-call function.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- SOS emergency-call malfunction is identified in the verified manufacturer communication.
- B129C11 may be stored with B129B11 in emergency call control module 91.
6. Possible causes
- 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
- Arrange diagnosis through an Audi service provider if an SOS emergency-call malfunction is present.
- Do not attempt high-voltage or module repair based on this information.
10. Step-by-step troubleshooting
- Confirm whether B129C11 and/or B129B11 are stored in emergency call control module 91.
- Review the applicable Audi manufacturer communication using the vehicle VIN, model, model year, and equipment. Further troubleshooting steps are not established by the supplied verified evidence.
11. When to contact service
Contact an Audi service provider for diagnosis of an SOS emergency-call malfunction and stored B129C11.
12. What the service center may check
- Check emergency call control module 91 for stored B129C11 and B129B11.
- Determine whether the vehicle is covered by the applicable Audi manufacturer communication. Additional service checks are not yet established by verified evidence.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Audi A7 · 2021 · US
- Audi A8 · 2021 · US
- Audi Q5 · 2021 · US
- Audi e-tron · 2021 · US
15. Related TSBs / service bulletins
- Audi PSS/Technical Service Bulletin Group 91, number 21-47, document 2061625/3, dated November 3, 2021: “SOS emergency call malfunction, DTC B129B11 and B129C11 are stored in the emergency call control module.” It supersedes Group 91 number 21-67 dated February 17, 2021.
- Audi Technical Service Bulletin Group 91, number 21-67, document 2061625/2, dated February 17, 2021: addresses the same SOS emergency-call malfunction and DTCs B129B11 and B129C11; it superseded Group 91 number 20-43 dated December 9, 2020.
- The supplied source summaries explicitly list 2020–2021 Audi A4, S4, A4 allroad, A5, A5 Cabriolet, A5 Sportback, S5, S5 Cabriolet, and S5 Sportback with all VIN ranges. The supplied applicability data separately lists US-market 2021 A7, A8, Q5, and e-tron. Vehicle-specific applicability should be confirmed by VIN.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified official NHTSA-hosted Audi manufacturer communications: https://static.nhtsa.gov/odi/tsbs/2021/MC-10203173-0001.pdf and https://static.nhtsa.gov/odi/tsbs/2021/MC-10187352-0001.pdf
19. Frequently asked questions
What does Audi DTC B129C11 indicate?
The verified communications identify B129C11 as a DTC stored in emergency call control module 91 in connection with an SOS emergency-call malfunction. A standalone code definition is not established by the supplied evidence.
Which Audi vehicles are named in the supplied bulletins?
The bulletin summaries name 2020–2021 A4, S4, A4 allroad, A5, A5 Cabriolet, A5 Sportback, S5, S5 Cabriolet, and S5 Sportback. Separate supplied applicability records list US-market 2021 A7, A8, Q5, and e-tron. Confirm applicability by VIN.
Is B129C11 related to B129B11?
Yes. Both verified communications state that B129B11 and B129C11 are stored in emergency call control module 91 in connection with the SOS emergency-call malfunction.
Can the vehicle be driven or charged with B129C11?
Not yet established by verified evidence.