Defect
On certain trucks, a problem with the trailer body control module could cause the trailer lights not to work.
Safety Risk
Trailer lights that don't work could make the vehicle less visible and cause following drivers not to recognize that the vehicle is braking or intends to turn or change lanes. These issues could increase the risk of a crash.
Remedy
Volvo Trucks will notify owners by mail and advise you to take your truck to a dealership to inspect and, if necessary, replace the trailer body control module.