NHTSA Complaint #11702553 — 2026 TESLA MODEL Y

Severe lateral swaying / side-to-side swaying (“boat-like” or “floaty” motion) at highway speeds (65–80 mph) on any concrete-surface interstate, especially grooved or slightly uneven concrete (typical on Illinois highways such as I-90, I-294, I-55, etc.). Description of safety concern: The vehicle continuously rocks side-to-side in a pronounced, pendulum-like motion that requires constant steering corrections to stay in the lane. The motion is severe enough to cause motion sickness in passengers within minutes and makes the driver tense and fatigued. In crosswinds or when passing trucks the swaying becomes even worse and feels unstable. I no amount of lane centering or driver input fully eliminates the sensation. Service history: December 2025 – Schaumburg, IL Tesla Service Center • Technician test-drove with me on I-90 and immediately felt the exact swaying I described. • Service advisor and service manager both stated this is a “normal characteristic of the 2025 Model Y Juniper” and that no repair or adjustment is possible. • Loaner 2025 Model Y Juniper provided exhibited identical swaying behavior. I do not believe constant, pronounced lateral instability at normal highway speeds is an acceptable “characteristic” in any passenger vehicle. It impairs control, increases driver fatigue, and creates a legitimate safety risk, especially in adverse weather or emergency maneuvers. Tesla refuses to acknowledge this as a defect. I am therefore requesting NHTSA investigate whether the 2025 Tesla Model Y suspension calibration and/or damper tuning creates an unreasonable safety risk due to excessive lateral instability on typical U.S. concrete highways