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Audi B16D731

Right tail lamp 2, no signal/open circuit

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact an Audi dealer or qualified service facility for diagnosis and to determine whether the documented tail-lamp software update applies.
Confidence95%

Quick answer

B16D731 means “Right tail lamp 2, no signal/open circuit.” Verified Audi/NHTSA evidence identifies overly sensitive tail-lamp diagnostic software as the technical background for this DTC in the covered vehicles.

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 B16D731 mean?

B16D731 means “Right tail lamp 2, no signal/open circuit.” Verified Audi/NHTSA evidence identifies overly sensitive tail-lamp diagnostic software as the technical background for this DTC in the covered vehicles.

2. Technical explanation

Audi documentation states that B16D731 may be stored in the comfort system central control module J393 (address word 0046). The bulletin identifies tail-lamp diagnostic software that is too sensitive and states that updated software is available for the tail lamps.

3. What system is affected?

Right tail lamp 2; the DTC is stored in the comfort system central control module J393 (address word 0046).

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • A warning may be duplicable, according to the Audi/NHTSA manufacturer communication.

6. Possible causes

  • Audi identifies overly sensitive diagnostic software in the tail lamps as the technical background.
  • Other causes are 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 by an Audi service provider or qualified repair facility.
  • Provide the exact DTC, B16D731, and the Audi/NHTSA manufacturer communication reference MC-10199220 when booking service.

10. Step-by-step troubleshooting

  1. Have a qualified technician check whether B16D731 is stored in comfort system central control module J393, address word 0046.
  2. Ask the technician to evaluate applicability of the available tail-lamp software update described by Audi.
  3. No further troubleshooting procedure is established by the supplied verified evidence.

11. When to contact service

Contact an Audi dealer or qualified service facility for diagnosis and to determine whether the documented tail-lamp software update applies.

12. What the service center may check

  • Confirm DTC B16D731 in J393, address word 0046.
  • Check applicability of the Audi tail-lamp software update.

13. Possible repair or resolution

  • Audi states that updated software is available for the tail lamps.
  • The supplied evidence does not establish any additional repair resolution.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication MC-10199220, published July 14, 2021: Audi states that B16D731 may be stored in J393 and identifies overly sensitive tail-lamp diagnostic software; updated tail-lamp software is available.
  • Applicability in the supplied database: 2020–2021 Audi e-tron, United States.

16. Recall information

  • No recall is established by the supplied verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication PDF 10199220, “A9421422063973_1,” published July 14, 2021: https://static.nhtsa.gov/odi/tsbs/2021/MC-10199220-0001.pdf

19. Frequently asked questions

What does Audi code B16D731 mean?

It means “Right tail lamp 2, no signal/open circuit.”

What does Audi identify as the technical background?

Audi identifies tail-lamp diagnostic software that is too sensitive.

Is there a documented remedy?

Audi states that updated software is available for the tail lamps.

Which vehicles are established by the supplied evidence?

The supplied applicability record covers 2020–2021 Audi e-tron vehicles in the United States.

Is it safe to drive or charge?

Not yet established by verified evidence.

20. Sources & verification

Verified
Audi B16D731: Right tail lamp 2, no signal/open circuit | EV Diagnostics