Speedometer glitch

I haven't seen it before, but I was on the highway this morning with the cruise control set to 70, when I looked down the needle was ticking like a watch second hand down and up from 70 to 69 and back. Voltage was steady at 13.6. Wondering if anyone has seen this.

 

Mine has done this for months..be going at a steady speed and start slowing down and it ticks down like you said..but is smooth going up.sometimes when I stop it’s stuck on 10mph.

 

Cruise set on Dynamic or Constant Speed?

 

Dynamic. No cars in front, went away after a minute and was steady again.

 

My speedo has had a tick since new. I could have brought it back under warranty but I have such little faith in dealerships I never did. It’s never changed or gotten worse, truck has 93,300 miles now. Hopefully I didn’t jinx it lol.

 

Interesting, I have never noted this on my 2019. But honestly, I have never really looked at it that closely while driving. I will pay more attention to the speedo next time I am on the road. For science!

 

Was it windy?
I've noticed a similar thing when driving into the wind.

 

Is your truck a manual? Mine has done this randomly since new (maybe 2 dozen times in 5 years?), I believe in a previous thread it turned out a bunch of us who had it happen drove manuals. Not sure what the correlation would be there, but most people just leave it be since it happens so infrequently.

 

Not windy, and an automatic, I'm not going to worry about it, just something that was noticed.