NHTSA complaint #11722131

Owner complaint summary

Vehicle Safety Complaint - Tesla Cybertruck Steering System Failure During FSD While driving my Tesla Cybertruck with Full Self-Driving (FSD) engaged, the rear steering system failed without any prior warning. FSD immediately disengaged, and a red steering system ERROR appeared on the instrument cluster. The rear axle steering was completely disabled, turning radius became severely limited, and vehicle speed was restricted. This occurred while actively driving in traffic and was extremely dangerous. I accessed the vehicle’s Service Mode and documented three fault codes that triggered simultaneously at 17:48:14 on March 4, 2026: 1.RSAM_a260_monitorTripDetected ∙Monitor trip detected, system degraded ∙Potential Impact: Steering system performance degraded, vehicle speed limited ∙Only clears on next power-up 2.RSA_a212_activeFault ∙Rear Steer Actuator (RSA) stopped at current position ∙Internal condition detected, defaulted to safe state ∙Fault Reason: CONTROLLER_IRRATIONAL ∙Previous State: RSASTATE_ACTIVE_STEERING (was actively steering when failure occurred) ∙rsamControllerRational = false 3.PEPS_a182_rearSteerDegraded ∙Primary Electric Power Steering (PEPS) detected RSA not functioning as expected ∙Reason: RSA_UNHEALTHY ∙rsaUnhealthy = true ∙rearSteerCommand = -0.59 All three faults were set at 17:48:14 and cleared at 17:50:55. Additionally, an earlier alert — EGGRIGHT3_a203_airwaveLeftLateralUnavailable — was logged on March 2, 2026 at 21:11:08, which may indicate a related or recurring issue. The simultaneous failure of the rear steering actuator and disengagement of FSD while driving at speed represents a serious safety hazard. The RSA controller was flagged as “IRRATIONAL” while the system was in active steering mode, meaning the steering hardware failed during operation — not at startup or in a parked state. I have photographic documentation of both the dashboard steering ERROR warning and all Service Mode diagnostic screens showin