B1A86 on 2021 Audi e-tron (e-tron quattro, e-tron Sportback) — Function Button Charge Door 1 Faulty
1 vehicles · 1 makes
How to diagnose and fix B1A86: most-reported vehicles
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Audi e-tron · 2021–2021
Audi TSB 2061788/2 covers model-year 2021 e-tron quattro and e-tron Sportback vehicles with specified AC/DC charging interruptions, charging-flap operation problems, or an app request for auxiliary heating that does not pre-heat the vehicle when matching DTCs are stored in high-voltage battery charger control module J1050. Audi attributes the documented condition to onboard-charger software and identifies old software level 0070, not a proven failed charger module.
Common Symptoms
- AC or DC charging is interrupted
- DC charging does not start or stops at some stations
- Charging-flap button is inoperative or the flap does not open
- Auxiliary heating is activated through the app but the vehicle does not pre-heat
How to Fix
Record whether the failure is AC, DC or station-specific and have J1050 scanned before parts. If the vehicle has the matching condition and software level 0070, Audi directs an SVM update to software 0079 or higher. After the update, reproduce the concern and follow the guided test plan for any new active DTC. Do not assume a hardware failure just because one charging mode works.
Owner tips & cautions
- TipBring the failed station, date and charging mode to the diagnosis and ask for the J1050 software level and full DTC list before authorizing hardware.
Sources for this issue (1)
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B1A86 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
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The most common causes of B1A86 are: Outdated onboard-charger (OBC) software - Audi TSB 2061788 identifies software level 0070 as the root cause on 2020-2021 e-tron, Failed charge-door push-button switch,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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.