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Volkswagen U164400

Ethernet control unit for digital sound package, no communication, active static/passive sporadic  Symptom 2498671 Technical Service Bulletin Transaction No: 2064412/2 01-21-10 -

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService need is not established by the supplied evidence. Volkswagen service can determine whether the code matches the bulletin context and whether any additional diagnosis is needed.
Confidence95%

Quick answer

For a 2021 Volkswagen ID.4 in the US, DTC U164400 is identified in a Volkswagen Technical Service Bulletin as: “Ethernet control unit for digital sound package, no communication,” with active/static or passive/sporadic status. The bulletin concerns irrelevant DTCs logged in various control units.

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 U164400 mean?

For a 2021 Volkswagen ID.4 in the US, DTC U164400 is identified in a Volkswagen Technical Service Bulletin as: “Ethernet control unit for digital sound package, no communication,” with active/static or passive/sporadic status. The bulletin concerns irrelevant DTCs logged in various control units.

2. Technical explanation

Verified evidence identifies U164400 as a no-communication fault involving the Ethernet control unit for the digital sound package. The supplied official Volkswagen bulletin lists the code among irrelevant DTCs logged in various control units. The supplied evidence does not establish the underlying failure mechanism, diagnostic procedure, or a specific repair.

3. What system is affected?

Ethernet control unit for the digital sound package.

4. How serious is this code?

Unknown. The supplied verified evidence does not assign a severity level.

5. Symptoms you may notice

  • A no-communication DTC for the Ethernet control unit for the digital sound package is recorded.
  • The supplied evidence does not establish any driver-observable symptoms.

6. Possible causes

  • 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 fault scan, including whether U164400 is active/static or passive/sporadic.
  • Arrange Volkswagen service diagnosis if the code is present or if related vehicle concerns are observed.
  • Do not attempt high-voltage or network-component repairs without qualified service support.

10. Step-by-step troubleshooting

  1. The verified bulletin identifies U164400 as an irrelevant DTC in its stated context.
  2. No further troubleshooting steps are established by the supplied verified evidence.

11. When to contact service

Service need is not established by the supplied evidence. Volkswagen service can determine whether the code matches the bulletin context and whether any additional diagnosis is needed.

12. What the service center may check

  • Confirm the vehicle is a 2021 Volkswagen ID.4 for the US market.
  • Confirm U164400 is present and document its active/static or passive/sporadic status.
  • Review Volkswagen Technical Service Bulletin Transaction No. 2064412/2, titled “Irrelevant Diagnostic Trouble Codes (DTCs) Logged in Various Control Units.”

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Volkswagen Technical Service Bulletin Transaction No. 2064412/2, “Irrelevant Diagnostic Trouble Codes (DTCs) Logged in Various Control Units,” release date October 17, 2022. NHTSA manufacturer communication number MC-10224843-0001.
  • The bulletin lists U164400: Ethernet control unit for digital sound package, no communication, active/static or passive/sporadic, under Symptom 2498671.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication PDF 10224843, Volkswagen TSB Transaction No. 2064412/2: https://static.nhtsa.gov/odi/tsbs/2022/MC-10224843-0001.pdf

19. Frequently asked questions

What does U164400 mean on a Volkswagen ID.4?

The supplied official Volkswagen bulletin identifies it as “Ethernet control unit for digital sound package, no communication.”

Is U164400 covered by a Volkswagen service bulletin?

Yes. The supplied evidence cites Volkswagen TSB Transaction No. 2064412/2, concerning irrelevant DTCs logged in various control units.

Does U164400 mean the vehicle is unsafe to drive or charge?

Not yet established by verified evidence.

What repair fixes U164400?

Not yet established by verified evidence.

20. Sources & verification

Verified
Volkswagen U164400: Ethernet control unit for digital sound package,… | EV Diagnostics