Tail lights wont turn off

This problem affects only the red part of the following lights: the tail lights and the outside cab light for the truck bed. First of all, earlier in the day, the check engine light came on...reset itself.

Later that evening, went to store and came out to find the red portion of the tail lights and the truck bed light on. Thought maybe I'd not locked it correctly or something. Got home and parked and locked the truck for the night, the red portions of the taillights and the truck bed light won't go off.