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.

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!
  1. Home
  2. Questions
  3. My speedometer is going back and fourth and drops to zero while driving but, my rpm gauge is fine.

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: Need non-working gauges replaced.

If the gauges on your instrument cluster are not functioning properly I would first recommend checking for blown fuses. This is the most common cause of this issue. If no fuses are blown and none of the gauges are working...

Q: There's a ticking taping noise going kinda coming from wheel wen acelerate around 30 but stop wen turning

Hi there. This noise could be coming from a wheel bearing that is damaged or is beginning to wear out. It is also common that a CV joint that is worn out, a brake rotor that is warped and rubbing...

Q: Can a front end vehicle accident cause the crankshaft to stick?

Fault code P0015 has to do with with the exhaust cam timing. This fault is set when the engine control unit determines the exhaust cam is not in the position requested by the ECU. Possible causes can be oil flow...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...