either over or undersized tires or other than stock gears ? or a svv valve or instrument panel goin out...
Speed sensor...on the passenger side of the tranny where the axle enters the transmission.
The size of tires can effect that accuracy of a speedometer. Larger tires will cause the speedometer to read less than you are actually going.
Cruise will NOT work if the speedometer has a problem
instantaneous speed. =)
instantaneous speed
Broken speedometer cable.
the logical choices is:: MAY BE YOUR DISK IS DAMAGED; SYSTEM MALFUNCTION; AND INVALID HARD DRIVE
Is the TCM working normally and throwing no codes?
If the speedometer and odometer are both not working, I would blame the speed sensor. If only the speedometer does not work and the odometer does work, the cluster is bad.
Could be one of a thousand things. Go to a shop and have them read the error code.
Speedometers are not allowed by law to under-read, but are allowed to over-read by no more than 10%. So at a true 30mph, they can legally read anything between 30mph and 33mph. Because they read the speed via a sensor in the transmission, not the true speed of the vehicle across the ground, they have to be calibrated such that they under-read slightly when the vehicle is lightly laden and has brand new tyres fully inflated. As the tyres wear, and if they are slightly under-inflated, or compressed by a greater load in the vehicle, the speedometer will over-read by more.
what causes the speedometer not to work