Q: My speedometer intermittently works at about 1/2 speed.

asked by on

Usually when first starting out the speedometer reads about 1/2 speed. Then usually along the way it starts working. There are no transmission issues. Shifts fine. Could this be a front wheel speed/ABS sensor?

My car has 130000 miles.
My car has an automatic transmission.

As long as there is nothing wrong with the transmission, it would have to be a problem with either the speedometer drive cable, or the speedometer head unit. The drive cable is driven off of a gear in the transmission and transmits the speed of the transmission to the speedometer head unit in the instrument cluster. The sensors mounted to the wheels is typically used by the anti-lock brake system to monitor the relationship between vehicle speed, and the speed at the wheel, so the computer can tell whether or not a wheel is locking up during braking, and needs to pulse the brakes. To avoid any unnecessary repairs, consider YourMechanic, as one of our mobile technicians can come to your home or office to diagnose the issue with your speedometer.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My speedometer intermittently works at about 1/2 speed.

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: fuel guage not working.

Hello, thank you for writing in. The fuel pump itself has a level sensor that may have been damaged during the process. It is physical float that rises and lowers with the level of fuel in the tank, and then...

Q: Can I change my V8 to a V6 in my 2000 Mercury Moutaineer

Hello. This is something that is possible but it is not typically cost effective. The engine will fit in place but you will need to change over the transmission and all of the electrical and the computers. Once that is...

Q: My car shakes while it idles but says there is an evap system leak?

An evap leak is the same thing as a vacuum leak. A vacuum leak will certainly cause the engine to run roughly. I would recommend having your vacuum levels checked with a vacuum gauge by a qualified professional to determine...

Related articles

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...
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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.