Doesn't move forward or in reverse. When you go to engage forward or reverse a code -04 comes on and than when you hit the pot a code -01 comes up. I'm thinking its the battery but don't have the truck infront of me and the truck is isolated to where I can't put a load on it. History: the truck ran fine for a while than was set outside when it worked and after a couple months with it covered up it didn't work. Any ideas on what to check?

What do the codes mean?


ECS20

Thanks in advance for anyone that comments on the possible diagnosis.