Car manufacturer Tesla has hit back at claims its “safest SUV in history” has a fault after a $200,000 supercar was destroyed by a truck.

Shocking footage obtained by 9NEWS shows the moment the door of the Tesla Model X supercar was all but ripped off when it opened automatically on a major Sydney road.

Sam Kovac, the car’s owner, told 9NEWS the doors opened automatically on the Princes Highway, sending debris flying and causing “carnage”.

Mr Kovac claims he was metres away consulting with a pet owner inside his Southern Cross veterinary clinic when it happened without notice.

“I came out to find my car in bits, it was just carnage,” he said.

“They key was nowhere near me at the time, it was 25 metres away from the car and the car obviously did it all on its own.”

The optional feature on the Model X requires two double clicks for both front doors to open.

Tesla claims the driver would have had to press the key fob up to four times for the doors to open.

“Our data records clearly show that the customer had this feature set to ‘on’ at the time of the incident,” it said in a statement.

The Tesla Model X has been marketed as the safest SUV on the market. (AAP)

The company also said it spoke to Mr Kovac who made it clear he understands how the doors function and had pressed the fob key multiple times.

Mr Kovac denies he told Tesla he pressed the fob key, but experts are warning either way owners need to be aware of potential hazards.

“We don’t know if the key has been pressed or malfunctioned here but certainly it’s not pretty. Clearly it’s a feature that if it can just happen as this video shows it may not necessarily be an advantage,” Alborz Fallah from caradvice.com.au told 9NEWS.