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Audi C12D7F0

Emergency assistant Status feedback for HMI implausible

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact an Audi dealer or qualified Audi service facility for diagnosis and the applicable control-module parameter/coding update.
Confidence95%

Quick answer

C12D7F0 is an Audi driver-assistance DTC meaning “Emergency assistant Status feedback for HMI implausible.” Verified evidence identifies an update needed to a parameter setting/coding in the driver assistance systems control module J1121 (address word 00A5).

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 C12D7F0 mean?

C12D7F0 is an Audi driver-assistance DTC meaning “Emergency assistant Status feedback for HMI implausible.” Verified evidence identifies an update needed to a parameter setting/coding in the driver assistance systems control module J1121 (address word 00A5).

2. Technical explanation

Audi’s official manufacturer communication states that C12D7F0 may be stored in driver assistance systems control module J1121, at address word 00A5, with symptom code 65551. The documented technical background is that a parameter setting/coding in J1121 needs to be updated. The issue is described as usually not reproducible and occurring only sporadically while driving.

3. What system is affected?

Driver assistance systems control module J1121 (address word 00A5), including Emergency Assist status feedback for the HMI (human-machine interface).

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • The setting to change Emergency Assist activation status may be grayed out.
  • A message is referenced in the official communication; the supplied evidence excerpt shows only the ending: “...ased/expired. See owner’s manual.”
  • The condition is described as sporadic while driving and usually cannot be reproduced in the workshop.

6. Possible causes

  • Audi’s official communication identifies a parameter setting/coding in driver assistance systems control module J1121 that needs to be updated.

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

  • Follow applicable warnings in the vehicle owner’s manual.
  • Arrange Audi service if the message, unavailable setting, or DTC is present.
  • Do not attempt to change control-module coding yourself.

10. Step-by-step troubleshooting

  1. A service technician can check driver assistance systems control module J1121 at address word 00A5 for DTC C12D7F0 with symptom code 65551.
  2. The verified communication indicates that the condition may be intermittent and may not be reproducible during a workshop visit.

11. When to contact service

Contact an Audi dealer or qualified Audi service facility for diagnosis and the applicable control-module parameter/coding update.

12. What the service center may check

  • Check J1121, driver assistance systems control module, address word 00A5.
  • Confirm whether C12D7F0 is stored with symptom code 65551.
  • Review and apply the parameter setting/coding update described in Audi’s official communication, as applicable.

13. Possible repair or resolution

  • Audi’s documented resolution is to update a parameter setting/coding in driver assistance systems control module J1121.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication PDF 10189531, published March 24, 2021: Audi documentation for C12D7F0. https://static.nhtsa.gov/odi/tsbs/2021/MC-10189531-0001.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified applicability: 2021 Audi A7 (US) and 2021 Audi e-tron (US). Source: NHTSA-hosted Audi manufacturer communication 10189531, published March 24, 2021.

19. Frequently asked questions

What does Audi code C12D7F0 mean?

It means “Emergency assistant Status feedback for HMI implausible.”

Which module stores this code?

The verified Audi communication identifies driver assistance systems control module J1121, address word 00A5.

What is the documented repair?

Audi states that a parameter setting/coding in J1121 needs to be updated.

Can I continue driving or charging?

Not yet established by verified evidence.

20. Sources & verification

Verified
Audi C12D7F0: Emergency assistant Status feedback for HMI implausible | EV Diagnostics