* The speed sensor is dirty or damaged. This can be caused by road debris or other damage to the sensor.
* The speed sensor wiring is damaged. This could be due to wear and tear, or it could be caused by an accident or other damage.
* The speed sensor connector is damaged. This could be due to wear and tear, or it could be caused by an accident or other damage.
* The instrument panel cluster is faulty. This could cause the speedometer not to work properly.
* The powertrain control module (PCM) is faulty. This could cause the speed sensor not to work properly.
Other possible causes:
* The transmission is slipping. This can cause the speedometer to read incorrectly.
* The tires are worn. This can cause the speedometer to read incorrectly.
