2018 Silverado 2500hd DEF Problems
 

After the Dealer replaced my block heater under recall. All of the sudden my DEF system is acting up. When I check the level on the wheel controls it shows " - -", never gives me a percentage of DEF. I just got a message 1,000 miles left on DEF fluid. So I got a jug and started to fill it and it's already full. WTF... any idea's out there??? Thanks for the help!!!