I have and '07 2500 auto 4x4 that is acting crazy. When pulling a trailer home over the weekend, came to a stop and pickup did not want to move. Made it home, parked it. Now when in reverse horn honks and lights flash but will not move, no speedo, has only 1 gear (I think 3rd) in drive, abs & check engine lights are one, code U1412, will not shift into 4 wheel drive.....any suggestions?

 

U1412=implausible vehicle speed signal recieved...

whatever that means???