“The stem could be the problem. On my S70, I took it apart and found a broken wire. After soldering the two ends together and shrink wrapping the connection, all was good.
However, this is not usually the point that is the problem. Here are a couple of other common Volvo cruise control fixes to consider:
Usually, it’s a broken hose on the cruise control pump that resides under the battery tray; or
The stop/brake light switch that is associated with the brake pedal has broken.
I checked both of these places out first before finally taking my turn signal stalk out and apart. Good luck and let us know how things go.”
With Volvo’s Adaptive Cruise Control, you can have your car maintain a preset speed or interval / spacing from the vehicle in front of you. This is made possible by the use of a a camera and a radar sensor to detect slower-moving in front of you. Together, they monitor the road and vehicles ahead of you and automatically adjust your vehicle’s speed. Be sure to always pay attention and keep your eyes on the road and your hands on the steering wheel even when you have Adaptive Cruise Control engaged.