B1A86 on Audi: How to Diagnose & Fix
Function Button Charge Door 1 Faulty
1 Audi model · 1 documented issue · 1 critical
B1A86 on Audi by model: symptoms, diagnosis and fix
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 infer hardware failure merely because one charging mode works, and do not order the former charger, 12-volt battery, relay, meter or portable EVSE from this card.
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)
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 on a Audi?
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. On Audi it is documented across 1 model: e-tron.
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The most common causes of B1A86 are: Outdated onboard-charger (OBC) software - Audi TSB 2061788 identifies software level 0070 as the root cause on 2020-2021 e-tron, Failed charge-door push-button switch,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 on a Audi?
Repair costs vary widely with the root cause and Audi model; each issue on this page carries its own estimate where one is published.
Looking for B1A86 on a different make?
View B1A86 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.