Cruise control stopped functioning

Caolan,

First thing to check is for any codes. That will point us to the system that has failed.

The most common cause is the stop lamp switch on the brake pedal. When this fails it sometimes applies voltage to the switch even though the pedal is not being depressed. The computer looks for any voltage on this circuit and if it is there, it turns the brake lights on. However, there is a threshold before the lights will come on. If there is any voltage then the cruise will not able to be set because pressing the brakes turns the cruise off.

So there is just enough to disable the cruise but not enough to turn the lights on.

Hopefully we have a code that can confirm this. If not, see if you can monitor the brake switch input and see if there is any voltage when the brakes are not depressed. It should be 0.

Let me know what you find and we can go from there. Thanks

Awesome. Sounds good. I will look for it and jump in otherwise one of the other experts will help out. Thanks for using 2CarPros.