B1A87 on Audi: How to Diagnose & Fix
Function Button Charge Door 2 Faulty
1 Audi model · 1 documented issue · 1 critical
B1A87 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)
B1A87 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 B1A87 mean on a Audi?
B1A87 stands for "Function Button Charge Door 2 Faulty." Same diagnostic as B1A86 but for the second charging door on vehicles equipped with two charge ports. J1050 has detected a faulty or implausible signal from the charge-door 2 release button and has disabled the electric flap release on that side. On Audi it is documented across 1 model: e-tron.
What are the most common causes of B1A87?
The most common causes of B1A87 are: Outdated onboard-charger software (level 0070) per Audi TSB 2061788, Failed charge-door 2 push-button switch, Moisture/corrosion at the charge-door connector, LIN bus wiring fault between charge door 2 and J1050. The specific cause varies by vehicle.
How much does it cost to fix B1A87 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 B1A87 on a different make?
View B1A87 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.