Phoenix tuner can't find motor controller

Team 9172 here, we are trying to change the can ID for our Tallon motor controllers with phoenix turner and after we run the temporary diagnostic it doesnt find the motor controllers. The tallon motors are blinking red, we arent sure what that means either.

Blinking red likely means you have a CAN fault. Somewhere along the bus there’s either a short or a disconnect. Go item by item checking all of the connections until you find it.