Runaway CIM motors

[BullBot Mentor]

Hello,

We are a rookie team, with the CIM motors running our drive wheels. During our testing today, we ran into a problem. After moving our joystick to its maximum position, the motor stuck. We released the joystick and the motor continued at top speed. After disconnecting the PWM cable from the Jaguar, we powered the system up again and the motor continued to spin at top speed.

Every time we power up the system, the motors run at top speed.

Has anyone ran into this before?

Thanks for any feedback.