Erratic Cruise Control

[87ChevyR10]

I'm curious, is the cruise control tied into the speedometer in some fashion? The reason I ask is when I first bought the truck, the speedometer functioned smoothly until winter hit and now it bounces around. Up until it started bouncing, I could engage the cruise and it would maintain speed. Now, if I were to engage the cruise, the throttle is erratic.

Is there a relationship between the two? Thx.

 

[GTME94]

Yes, the vehicle speed sensor takes a reading from the back side of the speedometer. It's a little greenish box with a wire. If the speedo is bouncing around it will think that the vehicle speed is changing and try to compensate.

 

[89Suburban]

A new speedometer cable should fix that issue.

 

[chengny]

A new speedometer cable should fix that issue.

X2

 

[87ChevyR10]

I had a feeling the 2 were tied together some how. It's not like I NEED the cruise anyways. Truck mainly gets driven around town. I'll look at replacing the speedo cable when the temps are more tolerable.

Thanks for the feedback!

 

[89Suburban]

Or pull the inner cable out at the transmission end and lube it up and re install just to get by and for a quick fix.