Speedo bouncing

[MikeG]

My speed started bouncing 1-2mph tonight anyone have any idea why?

 

[JCJ4290]

My speed started bouncing 1-2mph tonight anyone have any idea why?

It's an electric speedo so my assumption would be it's a deviation in the electrical current. How's the alternator and battery? Are the wires on the transmission loose? Start there and then go further.

 

[MikeG]

Had some time to look at it. Tested alt., batteries, cleaned battery terminals and plugs to the trans. Problem still exist so I hooked up my auto enginuity to see live data. My speed on the AE is bouncing to so I'm thinking it's the speed sensor. What do you guys think ?

 

[JCJ4290]

Agreed, that was a passing thought as well. Those things are fairly cheap and easy to replace. Is your truck still under warranty? If so, make Ram fix it

 

[MikeG]

Just powertrain. Truck has 43k on it now. Plus I don't trust the monkeys that work at the dealer.

 

[jlb]

I am surprised there is that much deviation without the truck throwing an ABS/Traction Control Light if it were a speed sensor.

 

[zkahn]

I saw this on a 2014 Laramie 2500 with about 200 miles on the O.D. (Helping with Dealer Trade). I noticed it on the interstate and it would present above 70mph. Under 70 I could not detect it. The only thing that I thought could be causing it was the amount of rain I had been driving through. This was back in June or July.

 

[MACH]

I had a 2013 Laramie 1500 that the speedo jumped 1-3 MPH only when I was around 65-70MPH. Otherwise it never did it. It drove me nuts, but got rid of it due to lemon issues with other things.

My 2014 sport I haven't had it happen yet....knock on wood.

 

[MikeG]

Mine now has a bounce and a delay. With at speed it bounces and when I go to accelerate it will have a slight delay before moving. Speed sensor will be changed Sunday.

 

[NYCruiser]

Thank goodness….I thought this was going to be a bathing suit thread…...

 

[JCJ4290]

Thank goodness….I thought this was going to be a bathing suit thread…...

Could happen, just saying. Santa Speedo Run and in the middle of December, my guess would be that they'd max out at 1-2 mph, lol.

 

[smiley]

My guess is replace the throttle body which also has the throttle position sensor as part of it. It worked for me when I was having that issue. I got mine from Matt at Moe's it was also an excuse to get a ported one.

 

[MikeG]

How would TPS affect speedometer ?

 

[smiley]

Makes rpms jump up and down and seems to cause trans to shift weird. I can't remember if it messed with speedo definitely rpm. Do you have a video of what is happening?

 

[smiley]

I went back and watched the video of what mine was doing and it was more related to RPM bouncing than anything but I can't see or remember exactly what speedo did when that happened. I wanted to do the mod in case and it worked in my case no more bouncing RPM. Speed might have nothing to do with it I don't know.

 

[MikeG]

I can get one. My rpm's and trans is fine. Truck it self runs and drives fine it's just the speedo bounces and has a delay.

 

[MikeG]

I diy ported my throttle body

 

[smiley]

Good luck getting it fixed. Please update with what ends up working.

 

[NYCruiser]

I don't even know where the speed sensor is in these trucks. Is it from the tranny or the abs? Maybe just find that and start by cleaning connections or pricing a replacement. If it's software controlled like everything else, you may need the dealer involved.

 

[smiley]

I don't even know where the speed sensor is in these trucks. Is it from the tranny or the abs? Maybe just find that and start by cleaning connections or pricing a replacement. If it's software controlled like everything else, you may need the dealer involved.

I was thinking the same thing.