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?

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!
  1. Home
  2. Questions
  3. Incorrect speeds on the speedometer

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: AC fan turns when tested to the battery but not turning when hooked up.

Hi there. The first thing that comes to mind based on your input is perhaps a ground wire is not properly attached to the AC control switch. However, it's also possible that the switch itself is faulty or there is...

Q: 1994Camaro 1994 Chevrolet Camaro Base 6 Cyl 3.4L My car is accelerating with me stepping on the gas I was driving fine all day

The throttle on this car has a cable and you should check the floor mat to make sure it is not holding the throttle pedal. Also, look at the throttle body to make sure something is not holding the throttle...

Q: Low oil pressure light came on when I started the car.

The oil pressure light will usually come on when a few things could be happening. Either the motor is in fact low on oil, the oil pump could be failing or the oil pressure sending unit is not working properly...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...