NHTSA complaint #11721572

Owner complaint summary

The vehicle is undriveable due to a high‑voltage enable safety lockout triggered by ECU identity/MAC mismatch after a software/update window; local service instructed me to ‘safely disregard’ active safety alerts contrary to vehicle telemetry, creating a safety risk. Chronology (key timestamps) • Jan 28, 2026 — Low‑voltage undervoltage precondition recorded (DIF_a018). • Feb 2nd, 2026 — Low‑voltage undervoltage precondition recorded (DIF_a018). • Feb 03, 2026 08:46 — Identity/MAC invalidation alerts (CP_a089 / CP_a077); HV‑enable blocked cascade. • Feb 24, 2026 — Service app: estimate approval prompt; supervisor instruction to ‘safely disregard’ active HV alerts captured via screenshot. • Feb 27, 2026 — Persistent handshake stall (CP_a066, State B1) despite ‘successful’ software job and new firmware update to patch the 2026.2 tree branch software. Vehicle remains grounded. Safety Concern Vehicle telemetry states HV contactors are blocked to protect the vehicle; service staff advised to disregard active alerts. Inconsistent guidance risks unsafe operation. I grounded the vehicle pending engineering review. Troubleshooting and A/B Tests My home EVSEs successfully charge a different Tesla (Model Y). The subject VIN charges at DC fast charging (Supercharger) and once on a third‑party EVSE, but fails on my two home EVSEs thereafter. This localizes the issue to vehicle‑side AC charge path/charge‑port logic rather than the EVSE. Request OEM to provide CP waveform under load + Toolbox logs. Please log this safety‑related defect; aggregate with similar complaints, and, if appropriate, open an investigation into identity/integrity faults causing HV‑enable lockouts and conflicting service guidance