The fire department mechanic truck had been stopped at a red light.
Airbags were activated in the crash.
The 28-year-old female driver from Lehi was transported to a nearby hospital with a broken ankle. Witnesses said it the vehicle didn't appear to break before the collision. The road was wet after rain.
Tesla's Autopilot system uses cameras and computers to regulate speed, change lanes and automatically stop cars.
Police said it's not immediately known whether the Tesla's autopilot driving system was in use when it rear-ended a truck apparently without braking before impact at approximately 60 miles per hour.
Gotham renewed for fifth and final season at Fox
Lethal Weapon did get renewed with the announcement that American Pie actor Seann William Scott will be replacing Clayne Crawford. The final season promises to give fans a satisfactory conclusion and it will finally see Bruce Wayne transform into Batman.
Tesla's main technical contact with USA safety investigators, Matthew Schwall, has left the electric carmaker for Alphabet's self-driving unit Waymo, the Wall Street Journal reported on Saturday, citing people familiar the decision.
The company confirmed the move earlier reported by the Wall Street Journal, which said Schwall joined Waymo's safety team led by former National Highway Traffic Safety Administration Deputy Administrator Ron Medford.
There was no immediate comment from Tesla about Schwall.
The national Council for transport safety is investigating an accident involving a auto Telsa Model S. the Accident occurred in the suburbs of salt lake city with cars, presumably working on the self-driving vehicle system. NTSB spokesman Keith Holloway said he did not know whether the agency would get involved. In March, a Tesla Model X SUV crashed on a California highway, killing the driver, and investigators are looking into the performance of the semi-autonomous driving system in that crash.