We have a 2000 Dodge 3500 2x4 cummins 24 valve diesel. The speedometer is jumping all the way to 0 and back up again. The ABS and Brake lights are also on and will not go off. When ABS light is on the scanner will not communicate. When ABS light is off it will communicate but comes up with no codes on the scanner.

We depend on this truck for part of our delivery business and need it up and going asap.

 

Sounds like a Rear Axle Speed Sensor or wiring trouble.

 

check the sensor on the rear diff it could have metal on it or be going bad.