NHTSA complaint #11738439

Owner complaint summary

Component/system: High-voltage (HV) battery system and power electronics. 2020 Porsche Taycan Turbo, VIN [XXX] . Vehicle available for inspection. Safety risk: Since January 2025, the vehicle has repeatedly displayed a "pull over and park safely" emergency warning and shut off unexpectedly while driving at highway and surface road speeds. Sudden loss of propulsion at speed created serious collision risk. Dealer-confirmed: Porsche Woodland Hills documented (July 2025): "vehicle just shut off on him as he was driving — multiple occurrences." A second shutdown was confirmed August 2025: "vehicle shut off while driving — high voltage battery error." Four or more repair visits under my ownership for this same defect. Fault codes confirmed by authorized Porsche dealers: P0AA600 (HV Battery Voltage System Isolation Fault — highest severity), P0A4000 (Rotor Position Sensor Fault), U178800 (Front Axle Power Electronics Drive Fault), P061B00 (Torque Calculation Fault). November 2025: Porsche Downtown LA isolated all 33 battery modules, found modules 6, 19, and 32 defective — all physically replaced. Vehicle out of service 9+ weeks. Shutdown warning recurred during same visit. Porsche NA (Case #XXX) denied repurchase. Warning lamps: "Pull over and park safely" warning and HV battery error appeared suddenly before each shutdown. No gradual symptoms. Recurring since January 2025. Additional: Prior owner records show HV battery water intrusion (February 2024) requiring full battery removal and reinstallation. In July 2024, dealer cleared "numerous inactive fault codes" without disclosure prior to my purchase. Porsche NA has acknowledged the issue by offering goodwill compensation while refusing repurchase. Cumulative out-of-service days for this defect exceed 75 days across multiple repair visits. I request NHTSA investigate whether this defect exists across other Taycan vehicles and whether a recall is warranted. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)