Audi U164200
Ethernet Emergency Call Module no communication
Quick answer
Audi DTC U164200 means “Ethernet Emergency Call Module no communication.” For verified 2019–2020 US Audi A8 and e-tron applications, Audi service communications associate it with an SOS malfunction message and a temporary loss of communication with the emergency call module and communication unit (ConBox), J949.
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 U164200 mean?
Audi DTC U164200 means “Ethernet Emergency Call Module no communication.” For verified 2019–2020 US Audi A8 and e-tron applications, Audi service communications associate it with an SOS malfunction message and a temporary loss of communication with the emergency call module and communication unit (ConBox), J949.
2. Technical explanation
Audi identifies U164200 as a communication-related DTC: “Ethernet Emergency Call Module no communication.” Verified Audi service communications state that a startup issue can sporadically cause the emergency call module and communication unit (ConBox), J949, address word 0075, to temporarily stop communicating with the rest of the vehicle. The code may be stored in the data bus on-board diagnostic interface (Gateway), J533, address word 0019.
3. What system is affected?
Emergency call module and communication unit (ConBox), J949, and its Ethernet communication with the vehicle network/Gateway J533.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- An SOS malfunction message may be displayed in the instrument cluster.
- U164200 may be stored in Gateway J533 (address word 0019).
6. Possible causes
- A startup issue can sporadically cause ConBox J949 to temporarily stop communicating with the rest of the vehicle.
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 with an authorized Audi service provider if the SOS malfunction message is present or U164200 is stored.
- Provide the service provider with the stored DTC and the applicable Audi manufacturer communication information.
- Do not attempt high-voltage or module repair procedures based on this code alone.
10. Step-by-step troubleshooting
- Confirm whether U164200 is stored in Gateway J533 (address word 0019).
- Check whether an SOS malfunction message is displayed in the instrument cluster.
- Have an authorized Audi service provider evaluate the communication concern using applicable Audi diagnostic guidance.
11. When to contact service
Audi service evaluation is appropriate because the verified evidence identifies a temporary communication loss involving the emergency call module and communication unit (ConBox), J949. Whether service is required is not otherwise established by the supplied evidence.
12. What the service center may check
- Check for U164200 in Gateway J533, address word 0019.
- Confirm whether related communication DTCs are stored.
- Evaluate the emergency call module and communication unit (ConBox), J949, for the documented temporary startup-related communication condition.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied communications state that a production solution existed or was updated, but do not provide sufficient verified repair details here to specify a repair.
14. Affected vehicles
- Audi A8 · 2019–2020 · US
- Audi e-tron · 2019–2020 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication PDF 10226968, published November 4, 2022: Audi communication A9122442062973_3. It identifies U164200 and describes a sporadic startup issue affecting communication with ConBox J949. https://static.nhtsa.gov/odi/tsbs/2022/MC-10226968-0001.pdf
- NHTSA Manufacturer Communication PDF 10222110, published September 23, 2022: Audi communication A9122332062973_2. It identifies U164200 and describes a startup-related temporary communication loss involving ConBox J949. https://static.nhtsa.gov/odi/tsbs/2022/MC-10222110-0001.pdf
- NHTSA Manufacturer Communication PDF 10191043, published April 20, 2021: Audi communication A9121912062973_1. It identifies U164200, an SOS malfunction message, and the ConBox J949 communication condition. https://static.nhtsa.gov/odi/tsbs/2021/MC-10191043-0001.pdf
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified applicability: US-market 2019–2020 Audi A8 and 2019–2020 Audi e-tron. The supplied official sources are Audi manufacturer communications published through NHTSA; they are not recall notices.
19. Frequently asked questions
What does Audi code U164200 mean?
It means “Ethernet Emergency Call Module no communication.”
What message may appear with U164200?
Audi service communications state that an SOS malfunction message may be displayed in the instrument cluster.
What documented condition can set U164200?
Audi states that a startup issue can sporadically cause ConBox J949 to temporarily stop communicating with the rest of the vehicle.
Can I drive or charge with U164200?
Not yet established by verified evidence.
Which vehicles are verified as applicable?
The supplied evidence verifies US-market 2019–2020 Audi A8 and 2019–2020 Audi e-tron vehicles.