Tesla has started pushing out a software update that will change battery charge and thermal management settings in Model S sedans and Model X SUVs following a fire in a parked vehicle in Hong Kong earlier this week.

The software update, which Tesla says is being done out of “an abundance of caution,” is supposed to “protect the battery and improve its longevity.” The over-the-air software update will not be made to Model 3 vehicles.

Tesla has not yet identified the cause of the fire or found any issues with the battery pack. But the company said it will act if it discovers a problem.

“The safety of our customers is our top priority, and if we do identify an issue, we will do whatever is necessary to address it,” Tesla said in a statement.

Here is the company’s statement in its entirety on the software update:

We currently have well over half a million vehicles on the road, which is more than double the number that we had at the beginning of last year, and Tesla’s team of battery experts uses that data to thoroughly investigate incidents that occur and understand the root cause. Although fire incidents involving Tesla vehicles are already extremely rare and our cars are 10 times less likely to experience a fire than a gas car, we believe the right number of incidents to aspire to is zero.

As we continue our investigation of the root cause, out of an abundance of caution, we are revising charge and thermal management settings on Model S and Model X vehicles via an over-the-air software update that will begin rolling out today, to help further protect the battery and improve battery longevity.

A Tesla Model S caught on fire March 14 while parked near a Hong Kong shopping mall. The vehicle was sitting for about a half an hour before it burst into flames. Three explosions were seen on CCTV footage, Reuters and the Apple Daily newspaper reported at the time.

Tesla was onsite to offer support to our customer and establish the facts of this incident, a Tesla spokesperson said. The investigation is ongoing.

Only a few battery modules were affected on the Model S that caught on fire and the majority of the battery pack is undamaged, according to Tesla.

The company noted that the battery packs are designed so that if “in the very rare instance” a fire does occur  it spread slowly and vents heat away from the cabin. The aim is to give occupants time to exit the vehicle.

The Hong Kong fire followed video footage posted in April that appears to show a Tesla Model S smoking and then exploding while parked in a garage in Shanghai.