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Cruise control fluctuates?

Tiny
CWHITE73
  • MEMBER
  • 2021 KIA SOUL
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
Once I set my cruise control, instead of staying at the speed I set it at it fluctuates up to 5-7 miles faster / slower. Cruise control is supposed to maintain the speed it's set to correct?
Sunday, May 21st, 2023 AT 8:17 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like you may have a radar sensor that is going out which affects the cruise control. We should run a CAN scan; you can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Here are the cruise control wiring diagrams so you can see how the system works. Check out the images (below). Please let us know what happens.
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Monday, May 22nd, 2023 AT 10:30 AM

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