EV Diagnostics
Verified EV diagnostic knowledge page

Audi B1A8604

Function button charge door 1 faulty

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence. Verified evidence states that the charging flap may not open and describes interrupted charging in the documented condition.
ServiceAudi service evaluation is appropriate because verified Audi communications document this DTC in the OBC and a potentially inoperative charging flap. Whether service is required is not otherwise established by verified evidence.
Confidence95%

Quick answer

B1A8604 means “Function button charge door 1 faulty.” Verified Audi communications associate it with a defective charging-flap function button and, in some cases, a charging flap that cannot be opened.

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 B1A8604 mean?

B1A8604 means “Function button charge door 1 faulty.” Verified Audi communications associate it with a defective charging-flap function button and, in some cases, a charging flap that cannot be opened.

2. Technical explanation

For specified US Audi e-tron vehicles, Audi technical communications list B1A8604 as a fault stored in the high-voltage battery charger control module (OBC), J1050, address word 00C6. The code definition is “Function button charge door 1 faulty.”

3. What system is affected?

Charging-flap function button / charge-door operation. The DTC is stored in the high-voltage battery charger control module (OBC), J1050 (address word 00C6).

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • The function button for charging flap 1/2 is defective.
  • The charging flap cannot be opened.
  • The source material also describes interrupted charging and auxiliary heating activated through the app without vehicle pre-heating; it does not establish that these occur in every B1A8604 case.

6. Possible causes

  • Audi technical communications identify a defective function button for charging flap 1/2 in the documented condition.
  • 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. Verified evidence states that the charging flap may not open and describes interrupted charging in the documented condition.

9. What you can safely do

  • If the charging flap cannot be opened or charging is interrupted, arrange diagnosis by an Audi service provider.
  • Do not attempt high-voltage system repairs.
  • Record whether the charge-door button operates and whether the flap opens, for the service appointment.

10. Step-by-step troubleshooting

  1. Have a qualified Audi technician scan the high-voltage battery charger control module (OBC), J1050, address word 00C6, for B1A8604 and any accompanying DTCs.
  2. Not yet established by verified evidence whether owner-performed troubleshooting will resolve this DTC.

11. When to contact service

Audi service evaluation is appropriate because verified Audi communications document this DTC in the OBC and a potentially inoperative charging flap. Whether service is required is not otherwise established by verified evidence.

12. What the service center may check

  • Read fault memory in high-voltage battery charger control module (OBC), J1050, address word 00C6.
  • Assess the charging-flap function button and charging-flap opening operation.
  • Check for other DTCs documented alongside B1A8604 when applicable.

13. Possible repair or resolution

  • The supplied verified evidence does not provide a specific repair procedure or confirmed repair resolution.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Audi manufacturer communication A9321472061788_3, published April 30, 2021; NHTSA reference MC-10191572. It documents B1A8604 in the OBC, J1050, in connection with the charging-flap button condition.
  • Audi manufacturer communication A9321452061788_2, published March 29, 2021; NHTSA reference MC-10189601.
  • Audi manufacturer communication A9321422061788_1, published February 5, 2021; NHTSA reference MC-10186996.

16. Recall information

  • No recall is established by the supplied verified evidence.

17. Official manufacturer information

Verified source: NHTSA-hosted Audi manufacturer communication MC-10191572: https://static.nhtsa.gov/odi/tsbs/2021/MC-10191572-0001.pdf

19. Frequently asked questions

What does Audi code B1A8604 mean?

It means “Function button charge door 1 faulty.”

Can B1A8604 prevent charging?

The verified evidence states that the charging flap can fail to open and describes interrupted charging in the documented condition. It does not establish that charging will be prevented in every case.

Which vehicles are supported by the supplied applicability evidence?

US-market Audi e-tron model years 2020–2021. The supplied data also separately lists model year 2021.

Is it safe to drive with B1A8604?

Not yet established by verified evidence.

20. Sources & verification

Verified
Audi B1A8604: Function button charge door 1 faulty | EV Diagnostics