Antilock/traction Control/electronic Limited Slip Abs Warning Light problems of the 2007 Toyota Sienna

The contact owns a 2007 Toyota Sienna. The contact stated while driving 40 mph going up a curvy road, the abs service warning light illuminated and the vehicle loss motive power for several seconds before independently regaining motive power. The contact stated that the failure was intermittent. The contact took the vehicle to a local dealer to be diagnosed however, the mechanic was unable to retrieve a fault code. The manufacturer was not made aware of the failure. The failure mileage was approximately 160,000.