Audi B200042
control unit faulty
Quick answer
For covered US-market 2019–2020 Audi A8 and e-tron vehicles, DTC B200042 is documented by Audi as “control unit faulty” in the laser scanner control module J1122 (address word 00CD), with symptom code 12582935. The supplied evidence does not establish drivability, charging safety, required repairs, or a specific root cause.
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 B200042 mean?
For covered US-market 2019–2020 Audi A8 and e-tron vehicles, DTC B200042 is documented by Audi as “control unit faulty” in the laser scanner control module J1122 (address word 00CD), with symptom code 12582935. The supplied evidence does not establish drivability, charging safety, required repairs, or a specific root cause.
2. Technical explanation
Audi manufacturer communications submitted to NHTSA list B200042 among DTCs that may be stored in the control module for laser scanner J1122. The documented DTC description is “control unit faulty,” and the associated symptom code is 12582935. The supplied records do not provide further fault-isolation details, diagnostic steps, or a confirmed component-level failure mechanism.
3. What system is affected?
Laser scanner control module J1122 (address word 00CD). The communications refer to laser-related adaptive-cruise-control faults alongside B200042, but the supplied evidence does not establish that B200042 itself causes a particular adaptive-cruise-control symptom.
4. How serious is this code?
Unknown. No severity classification is established by the verified evidence.
5. Symptoms you may notice
- B200042 may be stored in laser scanner control module J1122 with symptom code 12582935.
- No driver-observable symptoms are established by the supplied verified evidence.
6. Possible causes
- A fault described as “control unit faulty” is documented for B200042.
- A specific underlying cause 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 complete scan result, including B200042, control-module address 00CD, and symptom code 12582935 if present.
- Arrange diagnosis by an Audi-qualified service provider; the supplied evidence does not establish a do-it-yourself repair procedure.
- Do not assume this code indicates a high-voltage battery or charging-system fault; the verified evidence identifies the laser scanner control module J1122.
10. Step-by-step troubleshooting
- Confirm whether B200042 is stored in the laser scanner control module J1122 at address word 00CD.
- Confirm the associated symptom code. Audi’s listed symptom code for B200042 is 12582935.
- Review applicable Audi service information using the vehicle identification number and current vehicle configuration. Further diagnostic procedure is not included in the supplied evidence.
11. When to contact service
Audi service evaluation is appropriate because the supplied official communications identify the affected module and DTC but do not provide an owner-level resolution. Whether service is immediately required is not established by verified evidence.
12. What the service center may check
- Scan laser scanner control module J1122 (address word 00CD) for B200042.
- Verify whether symptom code 12582935 is stored with B200042.
- Use applicable Audi service information for diagnosis. Specific workshop tests are not established by the supplied evidence.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied official communications identify B200042 and its module context but do not provide a verified repair action or outcome.
14. Affected vehicles
- Audi A8 · 2019–2020 · US
- Audi e-tron · 2019–2020 · US
15. Related TSBs / service bulletins
- Audi manufacturer communication A9120292053776_4, published January 15, 2020 and filed with NHTSA as MC-10170633-0001, lists B200042 in laser scanner control module J1122 with symptom code 12582935.
- Audi manufacturer communication A9119092053776_3, published November 7, 2019 and filed with NHTSA as MC-10168721-0001, lists B200042 in laser scanner control module J1122 with symptom code 12582935.
- Audi manufacturer communication A9119042053776_2, published October 22, 2019 and filed with NHTSA as MC-10167140-0001, lists B200042 in laser scanner control module J1122 with symptom code 12582935.
16. Recall information
- No recall is established by the supplied verified evidence.
17. Official manufacturer information
Verified NHTSA-hosted Audi manufacturer communications: https://static.nhtsa.gov/odi/tsbs/2020/MC-10170633-0001.pdf ; https://static.nhtsa.gov/odi/tsbs/2019/MC-10168721-0001.pdf ; https://static.nhtsa.gov/odi/tsbs/2019/MC-10167140-0001.pdf
19. Frequently asked questions
What does Audi code B200042 mean?
The verified Audi communications describe B200042 as “control unit faulty.”
Which module stores B200042 in the supplied Audi evidence?
The code is listed in the control module for laser scanner J1122, address word 00CD.
What symptom code is associated with B200042?
Audi lists symptom code 12582935.
Is B200042 confirmed to affect charging or the high-voltage battery?
No. That is not established by the supplied verified evidence.
Which vehicles are covered by the supplied applicability data?
US-market 2019–2020 Audi A8 and 2019–2020 Audi e-tron vehicles.