On certain trucks, a software problem could cause the instrument panel cluster not to display while driving. As a result, you may not be able to see certain information about the truck, including the speedometer, fuel gauge, warning lights and malfunction tell-tales.
Warnings, tell-tales and gauges that don't display could increase the risk of a crash.
PACCAR will notify owners by mail and advise you to take your truck to a dealership to update the instrument panel cluster software.