Under certain conditions, a software problem may cause the throttle signal to be inverted. If this happens, the engine may not return to idle. As a result, the trucks don't meet certain requirements of Canadian regulations.
An engine that doesn't return to idle could cause a loss of control and increase the risk of a crash.
Volvo Trucks will notify owners by mail and advise you to take your truck to a dealership to update the electronic control unit software.