U15AB on Audi
Fast Battery Charging (DC) - Communication
U15AB on Audi vehicles indicates fast battery charging (dc) - communication. Au7o has documented this code across 1 Audi model — most commonly on e-tron. 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.
Common Causes of U15AB
- •Outdated onboard-charger software (level 0070) - the documented remedy is the OBC software update per Audi TSB 2061788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
U15AB 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 U15AB across all makes →Frequently Asked Questions
What does U15AB mean on Audi?▼
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. On Audi specifically, this code is documented across 1 model.
What causes U15AB on Audi vehicles?▼
Common causes on Audi: Outdated onboard-charger software (level 0070) - the documented remedy is the OBC software update per Audi TSB 2061788, Charging station firmware incompatibility or a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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U15AB on a Audi?▼
Repair costs vary widely depending on the root cause and specific Audi model.
Which Audi models have U15AB documented?▼
Au7o has documented U15AB on 1 Audi model: e-tron.