Skip the auto shop - Our mechanics make house calls

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.

A: As long as there is nothing wrong with the ...

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?

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: Problem with fuel gauge - 2000 Ford Escort

Hello. There are a few issues you are going to need to look into, and go through until you find the real issue. You can start by scanning the vehicle for diagnostic troubleshooting codes. This may or may not give...

Q: 2.0 rav4 when doing 80 speedo reads 40

Hello there, many common faults will cause speedometer issues with your 2000 Toyota RAV4. The first step is to check the vehicle for what code is stored in the computer, this will help pinpoint where the issue may lie. There...

Q: my van is making clunk and vibration noises that worsen while coasting or with less rpms

Hi there. It sounds like the transmission is having an internal failure. Some other possibilities are wheel bearing, axle, brake caliper, and brake hose collapsing. A worn wheel bearing will have noise at all speeds while increasing noise and vibration...

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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.