Q: My speedometer does not work

asked by on July 14, 2016

New and abs modual , new sensor, still won't work.

My car has 10000 miles.
My car has an automatic transmission.

Speedometer is not working Inspection $79.99 - $99.99 Get a Quote

The speedometer is controlled by the PCM (Powertrain Control Module). The PCM receives data from the ABS module then sends it to the instrument cluster. In all, there are three modules, and a VSS (Vehicle Speed Sensor) involved with the operation of the speedometer. This sort of design requires a professional level scanner to access all the modules in order to pinpoint the failure.

The data from each module needs to be observed to give us a clue to what is going on here. In addition, there is usually a code associated with systems that utilizes modules in this fashion. This code will give us a diagnostic path to begin with. It may not be the correct path, but often times a process of elimination needs to be employed to diagnose a vehicle.

The possible problems are:

  • Wiring harness issues between the modules and or the VSS.
  • PCM
  • Instrument Cluster. If the speedometer gauge itself is faulty, the instrument cluster as a whole will need to be removed and repaired. The instrument cluster should have a test procedure that can be initiated with a shop level scanner.

I would have included the ABS module and the VSS, but it appears you have already replaced those. It is possible that the parts you replaced are faulty, particularly if they are used. For this reason I highly recommend good quality parts.

If this is to daunting, as it will be for most, try booking an appointment with one of our certified technicians for a speedometer inspection.

Good Luck!

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $65/hr

What others are asking

Rat under Hood.

Of course, you want to be sure that the noise is really from the serpentine belt and/or connected rotating elements. If you simply take all of the belt driven accessories out of the picture by removing the drive belt and...

Where is my coolant leaking from? 2007 Dodge Caravan

Hello - you may have a coolant leak from a worn out water pump. If so, this could result in an immediate failure, as modern water pumps have a remarkable ability to work right up until complete failure. The "gurgling"...

I have a 2002 buick rendezvous and I'm looking to possibly swap the 3400 for an lx9 3.5

The re-designed gasket (Fel-Pro, for example, in the aftermarket) for the lower intake manifold on this engine, and the revised installation procedure, provide a 100% effective resolution to the notorious leak issue that you are referring to. With regard to...

Car won't start. Electronics work, but loud screeching noise comes from fuse/battery boxes in the trunk when turn ignition key.

Hi and thanks for contacting You Mechanic. There could be a lot of issues that could relate to this topic, however, I have narrowed it down to 4 things to check. First check the battery and make sure that the...

why wont my truck start? 2002 Chevy Trailblazer

Hello. If the car was running BEFORE you replaced all of these parts, the first thing to do is make sure that you have reconnected any wiring (harnesses, plugs, grounds) that you removed when you replaced the numerous items that...

Speed sensors on transmission

Without additional detail as to what the issue is that you are experiencing, this may be tough to diagnose without physically inspecting the vehicle or taking it for a test drive. As you may know the speed sensors on your...

whirring noise

Hi there: This sound may be coming from one of your belts; either the drive belt, power steering belt or serpentine belt. When the belts on your Volvo are starting to wear out or collect excessive brake dust or other...

2002 blazer 4x4 zr2 abs brake light stays on.

You would need to have the system scanned to see what the feedback the ABS light is giving. From there, you would need to turn off the light after the system is reset to see if it comes back. You...

possible misfire or trans/torque converter problem

Try driving the vehicle in regular drive or 3rd gear out of over drive and get to the same vehicle speed and see if the problem is gone. Then try driving to a speed where the engine speed is 1400...

Related articles

The Best Used Cars to Buy If You're Towing a Boat
If If you’re towing a boat, the vehicle that you buy is largely going to depend on the size and weight of your boat plus trailer. Most cars, realistically, aren’t cut out for the job. We recommend a pickup truck...
The Best Used Cars to Buy If You're a General Contractor
If If you're a general contractor, you probably aren’t in the market for a used car. More likely, you’re looking for a pickup truck, because you need to haul equipment and supplies to various job sites. Most contractors will likely...
The Best Used Cars to Buy For a Graduation Gift
Your Your little bundle of joy has grown up and on the cusp of entering adulthood. Graduating is a milestone, and you want to reward their hard work and show how proud you are. Buying a used car is a...