So my lower grill shutters are sending me a check engine light with two codes ECU1(#FD00) and ECU2(#FD20). Says they won’t open or close all the way. I watched them when I started the truck and they just keep cycling open and close. What do I need to look at to fix them so they will do what they need to do?

 

Did you look to see if there is something stuck in there not allowing the cycle to complete?

 

Yes I looked and made sure nothing was stuck and I even checked the connections of the wires.