B1A86 on 2021 Audi e-tron — Function Button Charge Door 1 Faulty
1 vehicles · 1 makes
Most Reported On
B1A86 is an OBD-II diagnostic trouble code meaning “Function Button Charge Door 1 Faulty.” The high-voltage battery charger control module (J1050, address word 00C6) has detected an implausible or failed signal from the electrical push-button used to release charging door 1. The module can no longer trust the button input, so the electric charge-flap release for that door is disabled and the flap must be opened with the manual emergency release. This code is most commonly reported on 2021 Audi e-tron.
Common Causes
Diagnostic Tools
B1A86 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does B1A86 mean?
B1A86 stands for "Function Button Charge Door 1 Faulty." The high-voltage battery charger control module (J1050, address word 00C6) has detected an implausible or failed signal from the electrical push-button used to release charging door 1. The module can no longer trust the button input, so the electric charge-flap release for that door is disabled and the flap must be opened with the manual emergency release.
What are the most common causes of B1A86?
The most common causes of B1A86 are: Outdated onboard-charger (OBC) software - Audi TSB 2061788 identifies software level 0070 as the root cause on 2020-2021 e-tron, Failed charge-door push-button switch, Corroded or damaged connector at the charge-door assembly / charge-level indicator, LIN bus wiring fault between the charge door and J1050. The specific cause varies by vehicle.
How much does it cost to fix B1A86?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by B1A86?
Au7o has documented B1A86 across 1 vehicle models from 1 manufacturers: Audi.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.