EV Diagnostics
Verified EV diagnostic knowledge page

Audi C12BFF0

Radar sensor automatic calibration not possible

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceThe verified warning messages instruct the driver to contact a workshop. Service requirement status is otherwise not established by the supplied evidence.
Confidence95%

Quick answer

C12BFF0 indicates that automatic calibration of an Audi radar sensor was not possible. Verified Audi service information says this can occur when the calculated dynamic angle offset exceeds ±5° during continuous calibration while driving above a defined speed threshold.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

No sufficiently relevant embeddable video has been accepted for this diagnostic yet.

Videos are supporting material and never override OEM or regulator evidence.

1. What does C12BFF0 mean?

C12BFF0 indicates that automatic calibration of an Audi radar sensor was not possible. Verified Audi service information says this can occur when the calculated dynamic angle offset exceeds ±5° during continuous calibration while driving above a defined speed threshold.

2. Technical explanation

Audi states that the relevant sensors continuously calibrate themselves against detected surroundings while the vehicle is driven above a defined speed threshold. C12BFF0 is stored when the calculated dynamic angle offset exceeds ±5° during that automatic calibration process. The code may be stored in a lane change assist control module J769/J770 (address 003C/00CF) or a radar sensor control module for object detection J1088/J1089 (address 00DB/00DC).

3. What system is affected?

Radar-based driver-assistance systems, including the lane change assist and radar object-detection control modules identified in Audi service information.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • The instrument display may show: “Rear cross-traffic assist: fault. Please contact workshop.”
  • The instrument display may show: “Audi pre sense: fault. Please contact workshop.”

6. Possible causes

  • During automatic calibration, the calculated dynamic angle offset exceeds ±5°.

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

  • Note any displayed driver-assistance warnings.
  • Arrange diagnosis by an Audi service facility or qualified workshop, consistent with the displayed instruction to contact a workshop.
  • Do not attempt radar-sensor calibration or repair procedures without appropriate professional equipment and instructions.

10. Step-by-step troubleshooting

  1. Have the workshop read fault memory in lane change assist control modules J769/J770 (address 003C/00CF) and radar sensor control modules for object detection J1088/J1089 (address 00DB/00DC).
  2. The verified evidence does not establish owner-performed troubleshooting steps or a specific repair procedure.

11. When to contact service

The verified warning messages instruct the driver to contact a workshop. Service requirement status is otherwise not established by the supplied evidence.

12. What the service center may check

  • Confirm whether C12BFF0 is stored in J769/J770 or J1088/J1089.
  • Evaluate the radar sensor automatic-calibration condition described by Audi, including whether the calculated dynamic angle offset exceeds ±5°.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Audi of America manufacturer communication A9621742063336_2, published November 24, 2021; NHTSA document MC-10203723-0001: https://static.nhtsa.gov/odi/tsbs/2021/MC-10203723-0001.pdf
  • Audi of America manufacturer communication A9621702063336_1, published June 10, 2021; NHTSA document MC-10197970-0001: https://static.nhtsa.gov/odi/tsbs/2021/MC-10197970-0001.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified NHTSA-hosted Audi manufacturer communications document C12BFF0 and the associated radar automatic-calibration condition. Applicability provided in the verified database is US-market Audi A7, A8, e-tron, e-tron GT, and RS e-tron GT model years 2019–2023; some entries begin with model year 2020. Confirm vehicle-specific applicability by VIN with Audi or an authorized service provider.

19. Frequently asked questions

What does Audi code C12BFF0 mean?

It means “Radar sensor automatic calibration not possible.”

What warnings can accompany C12BFF0?

Verified Audi service information lists “Rear cross-traffic assist: fault. Please contact workshop.” and “Audi pre sense: fault. Please contact workshop.”

Why does C12BFF0 set?

Audi states that it sets when the calculated dynamic angle offset exceeds ±5° during the sensors’ continuous automatic calibration process.

Can I drive or charge with C12BFF0?

Not yet established by verified evidence.

20. Sources & verification

Verified
Audi C12BFF0: Radar sensor automatic calibration not possible | EV Diagnostics