B1A88 on Audi: How to Diagnose & Fix
Charge Door 2 LIN Actuator - Communication Malfunction
1 Audi model · 1 documented issue
B1A88 on Audi by model: symptoms, diagnosis and fix
Audi TSB 2071343/1 covers a charging door that will not open when its button is pressed on 2019 e-tron quattro and an early 2020 e-tron Sportback quattro VIN range. A crack at the charge-level-indicator connector can admit moisture, causing oxidation or a LIN communication fault between the charging-door components and high-voltage charger. The door may then open only with the manual release. Matching DTCs include B1A8FF0, B1A89F0, B1A8AF3 and B1A88F3.
Common Symptoms
- Charging door does not open when its button is pressed
- Charging door opens only with the manual release
- B1A8FF0, B1A89F0, B1A8AF3 or B1A88F3 in high-voltage charger J1050
How to Fix
Use the owner-manual release only as directed to gain access; high-voltage-area diagnosis and repair belong with an Audi-qualified technician. Confirm model/VIN applicability and the matching DTC, then inspect the charge-level-indicator connector for cracks, moisture and oxidation. Audi’s procedure seals an undamaged connector or replaces the damaged charge-door unit and seals the updated connector as required. The former 93H6 service action expired in 2023, so confirm current coverage before work and do not order the former actuator or unrelated electrical parts.
Owner tips & cautions
- TipPhotograph the warning and ask the technician to record the exact DTC and connector condition before replacing the charge-door unit.
Sources for this issue (2)
B1A88 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 B1A88 mean on a Audi?
B1A88 stands for "Charge Door 2 LIN Actuator - Communication Malfunction." The high-voltage battery charger J1050 has lost or corrupted LIN-bus communication with the electric actuator that latches and releases charging door 2. Without valid actuator feedback the module will not command the door open. On Audi it is documented across 1 model: e-tron.
What are the most common causes of B1A88?
The most common causes of B1A88 are: Crack in the charging-indicator connector allowing moisture in, bridging the ground pin and the LIN pin (Audi TSB 2071343 - 2019 e-tron quattro / early 2020 e-tron Sportback), Corroded contact pins in the charge-door connector, Failed charge-door actuator motor, Damaged LIN wiring in the charge-door harness. The specific cause varies by vehicle.
How much does it cost to fix B1A88 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 B1A88 on a different make?
View B1A88 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.