2021 Tesla Model Y power train problems
30 owner complaints filed with NHTSA name the power train on the 2021 Tesla Model Y — 3% of all complaints for this model year.
What owners report
“The high-voltage battery failed unexpectedly shortly after the warranty expired (with only 9,000 miles past warranty). Tesla Service confirmed a main high-voltage battery defect and quoted a full battery replacement. A sudden high-voltage battery failure causes a complete loss of propulsion/power…”
filed Aug 8, 2026
“The vehicle’s secondary Autopilot Processor / car computer is internally faulted and stuck in a continuous wake/shutdown loop. This causes severe standby battery drain (~20 miles of range lost per day while parked) and completely prevents all over-the-air software updates - including federally…”
filed Jun 4, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Power Train problems in other Model Y years
| Year | Reports | Share |
|---|---|---|
| 2026 Model Y | 8 | 2% |
| 2025 Model Y | 1 | 1% |
| 2024 Model Y | 6 | 2% |
| 2023 Model Y | 29 | 3% |
| 2022 Model Y | 15 | 2% |
| 2020 Model Y | 6 | 2% |
Other reported problem areas on the 2021 Tesla Model Y
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.