Skip the auto shop - Our mechanics make house calls

Q: My speedometer is going back and fourth and drops to zero while driving but, my rpm gauge is fine.

asked by on

I was driving the other day and my speedometer started moving back and fourth. The rpm gauge is fine everything else is fine on the panel except for that speed gauge. I tested my car it pulled a code up p0335 I do have a wire harnes clip that is bad the wires look like they aren't fully connected I looked up where it goes to it said it went to the crank sensor. I just want to know what I should maybe look for first. Thank you for your help.

My car has 240000 miles.
My car has an automatic transmission.

A: Hello. The crankshaft position sensor will ...

Hello. The crankshaft position sensor will not cause a fluctuation in the speedometer gauge. It can affect the rpm gauge, but not the speedometer. If the speedometer is acting like this then most of the time this is caused by a failure in the vehicle speed sensor. When this sensor or the connection at the sensor fails then this will happen. If you are planning on having this speedometer issue repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.

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・Save up to 30%

Get a quote

What others are asking

Q: Speedometer off

Hi. The cluster will most likely need to be replaced as they can not be re-calibrated. To test the cluster, a certified technician would be able to hook up a computer to the car to read out what the various...

Q: Car only runs when it is jump-started - 1995 Cadillac Fleetwood

Hi! The first thing to check is that the battery cables are clean and tight and not corroded. They should be tight enough that you can not move those connections by hand. Check both at the battery and down where...

Q: Car loses power and stalls - 2014 Cadillac ATS

Hi! You may have to leave your vehicle with the dealership in order for them to be able to duplicate the concern. While it is not necessary for there to be diagnostic trouble codes present in the vehicle's computer in...

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...
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...
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.