Diagnosing a cruise control issue can be challenging. However, there are some simple things to start with that cannot be overlooked. The most common reason for an inoperative cruise control is brake light, or brake switch issues. Always start by checking to see if your brake light is stuck on, or if the brake light flickers with vibration. Most bikes, 2008 and newer, can go into a cruise diagnostic mode which is very helpful in determining an accurate diagnosis.