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: Ps pulley making noise, what do I replace?

Hi there. How much tension was placed on the belt during adjustment/installation? All drive belts have a specific range of tension that can be measured with a belt tension gauge tool, however experienced technicians usually use their feel of the...

Q: My minivan is overheating and there is brownish sludge in the coolant. I already got the water pump and the thermostat replaced.

A brownish sludge in the cooling system can occur for a few different reasons. If two types of coolant have been used in the cooling system, red and green for example, the mixing of these two types of coolant can...

Q: 2002 Buick Rendevous won't start

In addition to having a working battery, you will also need a good ground. Make sure all of the electrical connectors are tight and that the battery was installed properly. There are other systems to make sure are working correctly,...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.