While driving my 2021 Audi e-tron Sportback Prestige, the high-voltage battery warning light illuminated on the dashboard. At the same time, regenerative braking stopped functioning, resulting in reduced energy recovery and a noticeable decrease in driving range. Before taking the vehicle to an Audi dealership, I had the diagnostic trouble codes read by an independent repair shop. The technician advised me to take the vehicle to Audi because the diagnostic information reportedly indicated a potential high-voltage battery thermal runaway condition. I took the vehicle to an authorized Audi dealership. The dealer cleared the fault codes and returned the vehicle to me without replacing any high-voltage battery components or performing repairs. I was not advised that the vehicle was unsafe to drive. A few weeks later, the high-voltage battery warning light returned. I brought the vehicle back to the dealership, where I was informed that a high-voltage battery module had failed. The dealer has now recommended replacing the battery module at an estimated cost of approximately $12,000. I am concerned that the vehicle was returned to me after a reported high-voltage battery fault was simply cleared rather than repaired. I am also concerned that replacing only a single battery module may not address the underlying issue. Additionally, I am aware of high-voltage battery recalls involving other Audi, Porsche, and Volkswagen electric vehicles, and I believe this failure should be evaluated to determine whether it represents a similar safety defect. This issue presents a significant safety concern because it involves the high-voltage battery system, loss of regenerative braking, reduced vehicle range, and a reported battery thermal-related fault. I am requesting that NHTSA investigate whether this is a broader safety issue affecting 2021 Audi e-tron Sportback vehicles.
- NHTSA ID
- 11746695
- Incident
- Apr 1, 2026