They're trying to determine if distracted driving played a role in the four-vehicle crash on the Pacific Coast Highway in Malibu.
Sgt. Philip Brooks said Monday such a request is routine in major wrecks.
A publicist for the Olympic gold medallist says Jenner wasn't texting while driving and will provide his phone records if asked.
Jenner was driving a black Cadillac Escalade when he rear-ended a Lexus sedan that slammed into a Toyota Prius that had slowed or stopped on the highway.
The Lexus veered into oncoming traffic and collided head-on with a black Hummer.
The driver of the Lexus died at the scene.