Fiat Chrysler is recalling 4.8 million vehicles in the U.S. because of the risk that drivers may not be able to turn off the cruise control. The recall includes 15 Jeep, Dodge, Chrysler and Ram models from six model years. Fiat Chrysler says it can fix the issue with a software update. Earlier this week Tesla said it could fix a braking performance issue highlighted by Consumer Reports via a software update. These cases highlight the extent to which software controls critical safety systems in cars. 

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