B1A86 on Audi
Function Button Charge Door 1 Faulty
B1A86 on Audi vehicles indicates function button charge door 1 faulty. Au7o has documented this code across 1 Audi model — most commonly on e-tron. 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.
Common Causes of B1A86
- •Outdated onboard-charger (OBC) software - Audi TSB 2061788 identifies software level 0070 as the root cause on 2020-2021 e-tron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
B1A86 on Audi by Model
Audi e-tron(1 issue)
- 2021 e-tron Charging Interruptions with Onboard-Charger Software 0070 - Diagnosis Required2021
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.
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View B1A86 across all makes →Frequently Asked Questions
What does B1A86 mean on 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 specifically, this code is documented across 1 model.
What causes B1A86 on Audi vehicles?▼
Common causes on Audi: Outdated onboard-charger (OBC) software - Audi TSB 2061788 identifies software level 0070 as the root cause on 2020-2021 e-tron, Failed charge-door push-button switch,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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B1A86 on a Audi?▼
Repair costs vary widely depending on the root cause and specific Audi model.
Which Audi models have B1A86 documented?▼
Au7o has documented B1A86 on 1 Audi model: e-tron.