Symptoms
- Cruise control icon lit with a 'system unavailable' or fault message
- Adaptive cruise won't engage, or reverts to basic cruise control
- Common after a light front bumper impact or dirty sensor
Likely causes
- CommonFront radar sensor blocked by dirt, ice, snow, or a dirty license plate frameThe sensor is usually behind the front grille or bumper and needs a clear path.
- CommonHeavy rain, fog, or snow temporarily interfering with the sensorWeather can reduce sensor reliability enough for the system to disable itself.
- PossibleFront-end damage or misalignment from a minor collisionEven small bumper taps can knock the sensor out of proper alignment.
- Less commonSensor or module hardware faultLess common, more likely with age or after a bigger impact.
What to do
- Clean the area around the front sensor, typically in the grille or lower bumper.
- Remove any aftermarket license plate frame or accessory that might block the sensor.
- Note if the issue happens mainly in bad weather, which may resolve on its own once conditions clear.
- Check for any visible bumper damage if there was a recent minor collision.
- Have a shop check sensor alignment and recalibrate if needed after any front-end work.
- Have the sensor tested and replaced if it still fails when clean and undamaged.
Tools and parts
- Cloth for cleaning sensor area
When to call a pro
See a mechanic or dealer for recalibration after any front-end collision, even minor, since these systems need precise sensor aiming to work safely.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.