While driving on a congested highway, my steering wheel lost power making it impossible to control the truck's steering. The truck spun around multiple times before crossing lanes of traffic and hitting a guardrail head on. Thankfully, others avoided hitting my vehicle which would have caused more serious injuries. As of yet, the issue hasn't been reproduced or confirmed. The insurance company will conduct the Inspection. There were no warning lamps, alerts or symptoms prior to the steering wheel losing power. The insurance company has possession of the truck.