U15AB on 2021 Audi e-tron — Fast Battery Charging (DC) - Communication
1 vehicles · 1 makes
Most Reported On
U15AB is an OBD-II diagnostic trouble code meaning “Fast Battery Charging (DC) - Communication.” The onboard charger has a communication fault on the DC fast-charging link - the PLC/CCS handshake between the vehicle and the DC charging station is not completing or is dropping mid-session. The vehicle cannot negotiate or maintain the DC charging contract, so the session fails to start or is cut short. Audi TSB 2061788 lists U15AB00 among the DTCs stored in high-voltage battery charger J1050 on 2020-2021 e-tron quattro and e-tron Sportback with onboard-charger software 0070. This code is most commonly reported on 2021 Audi e-tron.
Common Causes
Diagnostic Tools
U15AB does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does U15AB mean?
U15AB stands for "Fast Battery Charging (DC) - Communication." The onboard charger has a communication fault on the DC fast-charging link - the PLC/CCS handshake between the vehicle and the DC charging station is not completing or is dropping mid-session. The vehicle cannot negotiate or maintain the DC charging contract, so the session fails to start or is cut short. Audi TSB 2061788 lists U15AB00 among the DTCs stored in high-voltage battery charger J1050 on 2020-2021 e-tron quattro and e-tron Sportback with onboard-charger software 0070.
What are the most common causes of U15AB?
The most common causes of U15AB are: Outdated onboard-charger software (level 0070) - the documented remedy is the OBC software update per Audi TSB 2061788, Charging station firmware incompatibility or a station-side communication fault, Poor contact or debris in the CCS DC pins of the charging socket, Damaged communication wiring between the charge socket and J1050. The specific cause varies by vehicle.
How much does it cost to fix U15AB?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by U15AB?
Au7o has documented U15AB across 1 vehicle models from 1 manufacturers: Audi.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.