1. Sensor/Wiring Issue: The speedometer receives speed signals from a sensor installed in the transmission or wheel (depending on the vehicle). If there's a problem with the sensor or the wiring between the sensor and the speedometer, it can cause the MPH to stop working or display incorrect information.
2. Faulty Speedometer Cluster: The speedometer cluster (the instrument panel that houses the speedometer and other gauges) might be defective. In such cases, other gauges like the tachometer and fuel level indicator may also be affected.
3. Vehicle Malfunctions: A faulty ABS (anti-lock braking system) module or transmission issues can sometimes cause the MPH to malfunction. In these cases, other symptoms, such as ABS warning lights or transmission problems, may occur alongside the non-working speedometer.
4. Blown Fuses: In rare cases, a blown fuse related to the speedometer circuit may cause it to stop working. Checking the fuses and replacing any blown ones might resolve the issue.
Since a functioning speedometer is essential for road safety, it's important to get it diagnosed and repaired promptly if it stops working. Take your vehicle to a trusted mechanic, preferably one experienced in diagnosing and fixing speedometer issues, to identify the exact cause of the problem and have it addressed appropriately.
