2018 Tesla Model 3 fuel/propulsion system problems
24 owner complaints filed with NHTSA name the fuel/propulsion system on the 2018 Tesla Model 3 — 2% of all complaints for this model year.
What owners report
“Potential safety defect: high-voltage battery and battery management system (BMS) appear to overestimate available energy and remaining range, creating risk of unexpected 0% state of charge or loss of motive power without warning. Across 20 documented charge/discharge cycles between January and May…”
filed May 16, 2026
“Tesla failed to properly diagnose a high-voltage battery isolation fault in my 2018 Model 3. Despite safety-critical BMS_a027 and BMS_a142 faults indicating multiple isolation failures, they skipped required insulation resistance testing, falsely blamed sand in a connector, and charged me $174.95…”
filed Jul 15, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Fuel/propulsion System problems in other Model 3 years
| Year | Reports | Share |
|---|---|---|
| 2025 Model 3 | 2 | 2% |
| 2024 Model 3 | 4 | 2% |
| 2023 Model 3 | 8 | 2% |
| 2022 Model 3 | 9 | 1% |
| 2021 Model 3 | 9 | 1% |
| 2020 Model 3 | 6 | 1% |
| 2019 Model 3 | 8 | 1% |
| 2017 Model 3 | 1 | 4% |
Other reported problem areas on the 2018 Tesla Model 3
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.