On [XXX] at [XXX] on [XXX] I experienced a sudden malfunction of steering control of my Tesla Model Y, followed by a rightward movement initiated by vehicle automation and potentially amplified due to the steering malfunction. The vehicle then collided with an 18-wheeler truck on the right lane and came to a stop on the middle lane. I was driving past Tracy CA on [XXX] towards Modesto on a personal trip to Merced with my daughter, [XXX] , in the front passenger seat to drop her off. Fortunately, there was no casualty or injury from this incident. We are fortunate enough to have survived physically unscathed. A difference of few seconds could have led to significant injuries or impairment. Pictures attached show the steering wheel position turned to the left at about 160 degrees, while the front wheels turned to the right at about 20-30 degrees. For a right turn itâs about a 220-degree position, which is not possible by a single swipe of the steering wheel. Please note, the front wheel position in below picture cannot be justified either way. The steering wheel and front wheel remained frozen in this position when high voltage battery supply got disconnected at crash. This proves the turn of the wheel, thereby the movement of my vehicle to the right was not caused by my steering wheel control. Vehicle Automation Engaged related to this safety incident- Advanced Driver Assistance Systems such as Autopilot, Lane Assist, Collision Avoidance Assist and other safety features