Skip the auto shop - Our mechanics make house calls

Q: Incorrect speeds on the speedometer

asked by on

Hi, I have problems with the speedometer in my car. It doesn't show correct speeds whatsoever. Sometimes it just gets stuck and show very high speed although I drive moderately fast. Other times it shows 50 mph although I don't drive and it should be zero. What should I do to fix this?

A: I believe there are two possible causes to ...

I believe there are two possible causes to the issue you are having. One of the potential causes would be a faulty vehicle speed sensor. On many vehicles this sensor is located externally on the transmission or transaxle. If this sensor has failed, it could send false signals to the instrument cluster. The other possible cause of this issue would be a faulty instrument cluster. There are small gears inside most instrument clusters that control the needles on the gauge. If these plastic gears have been damaged due to becoming brittle over time, the speedometer may become inaccurate. For best results, have this issue diagnosed by a qualified professional to inspect why your speedometer is not working.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: The heater wont turn on, on any setting.

This may be related to a faulty blower motor or blower motor relay. Occasionally, the blower motor itself will wear out or become faulty working intermittently as the bruch contacts inside the motor wear out. The blower motor relay supplies...

Q: No start

There are many causes of hard starting but illustrative ones are a faulty engine coolant temperature switch (sensor), EGR system problems, large vacuum leaks, a faulty idle air control valve, worn spark plugs, inadequate fuel delivery or pressure (clogged fuel...

Q: reduce engine speed , trac ,and service engine light on. Had gas pedal assembly and throttle replaced.. Wire harness or computer n

This vehicle may have a wire harness issue of bad crimps on the connectors to the cluster, engine control module (ECM), and other areas that can cause these intermittent failures. The codes you are receiving are most likely the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...