05 speedometer issues

[rllandon]

I have a 05 ram 1500 4x4 with factory 20" tires. My speedometer is showing 3-5 mph fast at slower speeds and 5-8 mph fast at highway speeds. Could this e a speed sensor problem, I'm not throwing any codes, or is there a way to calibrate the speedometer.

 

[Harley Harrold]

You can use a tuner to reset your speedometer. I use a SuperChips Cortex tuner on my truck. I measured the height of my properly inflated rear tire from the ground to the top of the tire. I entered that tire size in my tuner and now my speedometer is accurate, I compared it with my GPS.

 

[rllandon]

I don't have a tuner yet so I guess ill just have to watch my foot and remember my speed is off.... Thanks for the info