Tes­la is push­ing out a soft­ware update to all Mod­el S and X cars fol­low­ing two recent high-pro­file bat­tery fires. The automak­er said it’s issu­ing the update “out of an abun­dance of cau­tion.”

The over-the-air update will change some of the set­tings in the cars’ bat­tery man­age­ment soft­ware relat­ed to charg­ing and ther­mal con­trols, though the com­pa­ny didn’t go into fur­ther detail. (The soft­ware of Tesla’s bat­tery man­age­ment sys­tem is one of the company’s most close­ly guard­ed trade secrets.)

The soft­ware update comes after some high­ly pub­li­cized fires in Asia. In April, an old­er Mod­el S seem­ing­ly spon­ta­neous­ly com­bust­ed while sit­ting unused in a park­ing struc­ture in Shang­hai. The fire was caught by secu­ri­ty cam­eras, and the footage quick­ly went viral. Tes­la sent a team to inves­ti­gate the fire, but has not released any find­ings. Just this week, anoth­er Mod­el S caught fire in a park­ing lot in Hong Kong, short­ly after the own­er had charged the car.

Musk has claimed Tesla’s cars are “over 500 per­cent” less like­ly to catch fire

Fires involv­ing Tesla’s bat­ter­ies have got­ten a lot of atten­tion over the last few years, much to the dis­may of CEO Elon Musk. He has often point­ed to the fre­quen­cy of fires in inter­nal com­bus­tion engine cars, and has claimed Tesla’s cars are “over 500 per­cent *less* like­ly to catch fire.”

But what stands out about the two most recent fires is that, unlike most of the rough­ly 20 inci­dents Busi­ness Insid­er recent­ly cat­a­logued that date back to 2013, these cars were parked when they caught fire. Vehi­cle fires are a some­what com­mon occur­rence fol­low­ing a crash, and most fires involv­ing Tes­las have hap­pened after vio­lent wrecks (or in a few cas­es, some of the cars have reignit­ed after an ini­tial fire). But these new inci­dents involv­ing the spon­ta­neous com­bus­tion of its cars’ bat­ter­ies appear to have sparked Tes­la into action.

“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,” the com­pa­ny said in a state­ment.

Fires in elec­tric cars have to be han­dled dif­fer­ent­ly, as they can’t be put out with foam or oth­er chem­i­cals. Instead, they often require thou­sands of gal­lons of water to be extin­guished. Tes­la has worked with first respon­ders to make sure they’re equipped with the spe­cif­ic knowl­edge required to put out bat­tery fires.

The com­pa­ny has also pushed soft­ware updates to help curb fires at least twice before. In 2016, Tes­la released an over-the-air update to “pro­vide extra secu­ri­ty dur­ing charg­ing” after a Mod­el S caught fire in Nor­way. In 2013, Tes­la pushed an update that raised the Mod­el S’s ride height when trav­el­ing at high­way speeds to reduce the risk of debris punc­tur­ing the bat­tery pack. That update came on the heels of an inves­ti­ga­tion by the Nation­al High­way Traf­fic Safe­ty Admin­is­tra­tion into mul­ti­ple Tes­la fires. The agency closed that inves­ti­ga­tion in 2014 after Tes­la decid­ed to add more phys­i­cal pro­tec­tion to its bat­tery packs.

Pho­to by David Bush for The Verge

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