"Each time she put her hands back on the wheel, she took them back off the wheel after a few seconds", Tesla's report, as released by South Jordan Police Department, said.
South Jordan police released a summary of findings from the vehicle Wednesday showing the driver hadn't touched the Model S's steering wheel for 80 seconds before hitting the truck at a red light.
According to Tesla technicians, the recovered data from the vehicle showed that the driver repeatedly cancelled and re-engaged the Autopilot features.
The driver had previously told police that she had engaged the autopilot and was "looking at her phone prior to the collision".
The driver, who suffered a broken foot in the accident, has not been identified.
The electric auto company cautions drivers to keep their hands on the wheel and remain vigilant even while the vehicle is in semi-autonomous mode.
According to the results shared by the organization, which is presently carrying out safety tests of the Model 3, the electric vehicle from Tesla Motors has achieved a 'superior rating for front crash prevention'.
The police said the Tesla Model S during that day's trip registered more than a dozen instances of the driver's hands being off the steering wheel. The family of driver Walter Huang alleged that he had taken the auto in to the dealer several times, and had complained that Autopilot kept steering him toward the same barrier he ended up hitting.
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The driver engaged Autosteer and Traffic Aware Cruise Control on multiple occasions during this drive cycle.
The Autopilot system includes visual and audio warnings to drivers when they remove their hands from the wheel.
A 28-year-old Lehi woman was issued a citation after her Tesla slammed into the back of truck.
The National Transportation Safety Board, a separate government agency that looks into accidents and makes safety recommendations, has said it is not investigating the Utah crash. The auto was traveling at 60 miles per hour (97kph).
AEB is "designed to automatically engage the brakes to reduce the impact of an unavoidable frontal collision with another vehicle" and therefore, drivers should never rely on it to always save them from a crash. She manually pressed on the brake just before the crash.
Meanwhile, NHTSA investigators are still scrutinizing the conditions leading to fatal wreck in March in California, where Tesla's Autopilot system was in use.
Also, the Autopilot technology that monitors whether a driver has their hands on the steering wheel isn't a good way to tell if the driver is paying attention, the NTSB said.