If the speedometer needle is going crazy and not working properly, it is probably the speedometer mechanism that needs to be replaced. It could also mean the vehicle is having a transmission slippage problem if the needle is bouncing back and forth.
Speedometer gives a wrong reading for Yukon XL 2003?
So the speed gauge in the dash and the speedometer cable have been replaced. Well, the only thing left to my knowledge would be the geared speed sensor in the transaxle. I have the same problem. Replaced the speedometer cable but to no avail. I then took the speedometer out and used an electric motor to drive it on my bench and noticed that the part that is driving the needle (driven by a magnet) starts vibrating at certain speeds. On further investigation I found that the bush on the panel that the spindle goes through ( just behind the needle) is worn and hence the spindle/shaft does not run tight and starts vibrating/rattling and then it sometimes swing up and down. When I lightly touch the needle it stabilizes for a while and then starts vibrating again. The needle is not driven directly, but through a magnetic coupling so the slightest interference can cause problems. It seems the only solution is to replace the speedometer. Unfortunately you have to replace the whole cluster. I thought I could do something about the bush, but it is too delicate and you will have to remove the little coil spring which means the speedometer will have to be re-calibrated.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
This also happened to me and it only got worse. The dash electronics started going crazy. The speed needle would not read correct, the idiot lights all flashed on and off. I got stranded and found out my alternator was going and needed to be replaced.
Oh Yeah! Dating a 20 year old at 16. Is she CRAZY!
going on the freeway at 60 or more miles per hour the speedometer registers 0 mph what is wrong the car is a Hyundai sonata 2004 model with 6 cylinders
Either the cable dry or something is wrong in the head. Take the cable out first and lube it and see if that fixes it.
simple attraction maybe? nothing wrong with it though!!
Broken tooth in speedometer head. Replace speedometer head
My speedometer works and the odometer does not because there is a plastic gear in the odometer that is broken.
Yes, tires that are larger or smaller in diameter than original factory size will cause a car's speedometer to be wrong.
I'm not much of a mechanic, but you may have the wrong size tires on the car. Hope this helps.