Have you ever paid any attention to your car’s speedometer operation? Perhaps you don’t even remember. This part of your vehicle is easy to forget about until it fails. The speedometer may stop working and you won’t be able travel at your desired speed. This can be quite worrying. Many DIY mechanics are capable of performing repairs and repairing a speedometer that isn’t working. It is possible to fix a broken speedometer with ease.

How a Speedometer Worked

A speedometer is also called a speedometer. It measures and displays the vehicle’s speed. Since every vehicle, a speedometer is a common addition. You may find the speedometer on some vehicles as a large circular gauge located on the dashboard. The lowest numbers can be found at the bottom. The number goes up as the vehicle speed increases. A thin needle is located in the middle of the gauge. It indicates the speed at which it is moving. Speedometers usually have 2 rows of numbers. This indicates the speed in km/h or miles/h. The speed of the vehicle changes the number.

Cable-Driven Speedometer

Eddy Current Speedometers is another name for mechanical speedometers. These speedometers use magnetic eddy curents to display car speed. These analog devices are connected directly to the vehicle’s transmission. They were created in a time before electronic sensors were common. The shaft’s rotation also rotates the drive cable. The other end of the cable is connected to a circular gear. The rotation of the mandrel makes this gear turn too. The speedup is fitted with a spiral gear, which connects to the permanent magnetic field. Due to the magnet’s rotation, a rotating magnetic fields is formed. The magnet rotates creating a rotating magnetic field.

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Electronic Speedometer

To calculate the vehicle’s speed, electronic speedometers use a vehicle speed sensors as an alternative to a drive cables. The sensor includes a toothed metallic disk, a magnet coil, and an stationary detector. They are similar to the cable-driven speedometer drive cable. The shaft turns and the disk’s teeth interact with the coil’s magnet field. This triggers the detector and sends a pulse to . The computer uses the pulses for speed measurements, to calculate how fast the engine is turning and the distance that the vehicle has traveled.

Speedometer Problems

Your vehicle might display a few more issues. Many of these issues are caused by wear and tear over time. These issues can lead to a broken or dead speedometer. The most common issue in older vehicles is a broken cable connecting speedometer to transmission. Newer cars have speed sensors. But they are more susceptible to malfunctioning and preventing speed readings from being displayed. A malfunctioning component is another problem that can affect digital speed sensors. This is something that experts should be able to fix. These sensors will stop transmitting data to the vehicle’s computers once they cease working. The computer cannot measure the speed of the road and therefore the CEL ( Check engine light) glows.

How it’s done

A mechanic will examine your vehicle with a code reader/scanner in order to find and correct any error messages it may have generated. If the mechanic suspects the problem is related to the ECU, they will inspect the vehicle and locate the sensor. The mechanic will inspect the part and check the wires for damage. The mechanic will replace the sensor with a brand new one and remove any broken ones.


In diagnosing problems using a speedometer, a simple visual check can be helpful. You should also inspect the wiring and connectors to ensure that there are no signs of damage. If you suspect irregularities in the cluster functions, it is possible to inspect them. Sometimes, drivers notice that the speedometer needle is moving irregularly or jumping. This is done by removing the sensor’s damaged hold-down fastener, removing the component from its bore and installing it again. Wiring faults require more work and may involve replacing the pigtail or harness. Circuit repair may also be possible in some cases.

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