code 31
Condition
Controller has lost communication with the control handle card.

Truck Response
No Traction

Possible Causes and Test Procedures

1- Insure the cable is connected to the J2 Plug on the controller.
2- Verify all pin connections are tight and making contact.
3- Verify correct connector wiring.
4- Check continuity of the wires running from the controller to the control handle logic card.
Verify continuity while rotating the control handle arm from side to side.
5- Check for control handle wiring grounded to the truck frame.
6- Check for correct operation of the control handle logic card.
Use handheld programmer to verify signals from the control handle logic card are being received by the controller.
7- Replace controller


One of us is probably right here
posting a truck serial number is always more helpful that just throwing out guesses based on a mere description, an error code and partial model number, and no serial number. :o)