(Bloomberg) -- Volkswagen AG’s namesake brand, its Audi andPorsche divisions, Daimler AG’s Mercedes-Benz unit and GeneralMotors Co.’s Opel agreed with German authorities to recall 630,000cars Europewide to fix temperature-control setups on dieselmodels’ emissions systems.

The voluntary move affects diesel cars with engines that meetthe Euro-5 and later Euro-6 standards, German TransportMinister Alexander Dobrindt said Friday at a Berlin pressconference. Terms for dealing with any models built by carmakersoutside Germany will have to be agreed on with regulators thatcertify those vehicles, he said.

Temperature thresholds not justified

The recall is meant to fix a device that turns off emissionscontrols at particular temperatures as a means to protect theengine. A German probe of 53 models that tested them in thelaboratories and on the road found that temperature thresholds atwhich the controls shut down weren’t justified, Dobrindt said.

The regulatory investigation was prompted by Volkswagen’s revelations inSeptember that it had installed software on dieselmotors designed to cheat on official emissions checks. None of themodels tested were found to use illegal devices designed to defeatthe tests, the minister said.

Daimler said in a statement that it will upgrade emissionscontrols systems on 247,000 cars, reiterating that it hasn’tviolated any regulations. The OM 607-model diesel engine affectedis built in cooperation with French carmaker Renault SA andprimarily used in compact cars, the German company said. Audi saidit will fix 65,700 manual-transmission diesel cars, includingmodels from its Q5 sport utility vehicle and A6 and A8 sedanlines.

Opel had already announced the recalls earlier, and about 90,000autos are affected, said Alexander Bazio, a spokesman at the GMunit.

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