BMC Stuck on full throttle


New Member
Hi Folks,
First time poster, and I am looking for some advice.

I am working on a front hub motor bicycle. The motor is a 400W BMC unit with a matching controller, and 4 wire hall effect sensor. Whenever I turn on the key, the motor runs full throttle. I tried a new controller, and throttle (purchased thinking that they were the problem), but still the same problem. Does anyone have any idea what may be going on to make the brushless hub motor run full throttle all the time?

I have measured the ground continuity, and it is fine. I have swapped controllers and throttles, but still the problem persists. I'd love any feedback or suggestions of what to look at.