Walker was a passenger in a Porsche and a friend was driving when it hit a pole and burst into flames in November 2013, said the Hollywood Reporter.
A wrongful death lawsuit has apparently now been filed by Walker's daughter Meadow, alleging the carmaker took safety shortcuts.
Porsche has not yet publicly responded to the claims.
After a four-month investigation, police said the Porsche Carrera GT, driven by Walker's friend Roger Rodas, was travelling at 94mph (151kph) in a 45mph zone when it hit a lamp post.
Meadow, who is now 16, has not commented on the reports so far.