Skip the auto shop - Our mechanics make house calls

Q: Speedometer 5 MPH too slow

asked by on

The van is going five miles under the speed it is showing on the speedometer.

Speedometer issues are not very common and sometimes can be caused by things we do. For example replacing the tires. Tires need to be replaced with tires of the exact same size because that is the size that is programmed into the vehicles computer. So the speedometer calculation is done based on that. If you have replaced your tires with a different size, the vehicle can be reprogrammed to the new tire size so that it all works correctly. This is something that the dealership will need to do for you as it is a factory setting. If you have not replaced your tires, but are still having issues, it might be caused by the speed sensor in the transmission. Some vehicles have two speed sensors. A qualified mechanic can determine the speedometer issue and replace the necessary parts to get it functioning properly again.

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
  1. Home
  2. Questions
  3. Speedometer 5 MPH too slow

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: Do I need to replace the alternator?

You will need to have the alternator replaced. Older versions of alternators were serviceable at one point, and some still are. Todays parts are starting to be designed to be non-serviceable. You may find a mechanic that can service your...

Q: Fuel gauge failure

Hello there, you have several issues going on with your 1995 BMW 740iL. The fuel gauge issues and the speedometer faults may be related or separate issues. The speedometer has a few common faults such as a speedo gear failure,...

Q: I have antifreeze splattered all over the cover of my engine and all over

You definitely have a leak somewhere in the cooling system. The reservoir is not where the leak is coming from and it isn't the best place to check the coolant level. The coolant expansion tank is there to capture...

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 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 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.