HI we have this truck which doesn't have any ID plate so cannot provide serial. Its the same as cat trucks with twin drive Shunt motors and uses the gold logic card on the back along with a driver pcb and H Bridge card.

The truck works ok just max speed it goes up to is 6km Per hour, it used to go to 14kph.
No error codes. I went through settings option 11 is set to 0 so no speed limit is activated. Changed settings option 8 and 9 to 3 which is max.

Both motors are working. Can anyone suggest what could have reduced the speed and restricted it to minimum speed of 6kph?

Any input would be of great help.

thanks