According to the manual, this code means the maintanence alert is activated which will cause the truck to fail to reach full speed or can disable the truck. If you have a hand set, changing the value of function 19 and 20 to a value above 250 will disable the function. If you do not have the hand set, you cannot make the adjustment. You don't need a dealer tech just the hand set and you should be good to go.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.