What would cause my speedometer to jump around?

While you are driving, if you notice the needle on the speedometer jumps erratically from one number to another, the speedometer cable is most likely damaged or the sensors on the driveshaft are not accurately sending the signal through the cable.

What does it mean when your speedometer jumps up and down?

You could have a problem with the speed sensor that provides information to the speedometer — either with the sensor, the driven gear, or the wiring or connector to the system. A good diagnostic tool should be able to monitor sensor output and test the system.

What is a transmission speed sensor?

The speed sensor detects a gear or target wheel in the transmission and generates an electric digital signal proportional to the speed of rotation. The transmission controls use this information to modify various transmission functions such as shift points and perform diagnostic tests.

What are the symptoms of a faulty speed sensor?

5 Common Bad Speed Sensor Symptoms

  • Transmission problems.
  • Erratic speedometer readings.
  • Inability to engage cruise control.
  • Lack of torque converter clutch application.
  • Check Engine Light is triggered.
  • An internal electrical fault in the speed sensor.
  • Damage on the sensor itself.
  • Poor vehicle maintenance.

Why is my speedometer needle shaking?

Yes the needle tends to vibrate and not be smooth and stable once the Cable or the Gear at one end is worn out. Does the odometer read correctly? In that case the cable is not slipping. Needle flicking is normally the sign of a sticky inner cable.

Why does my speedometer needle shakes?

The reason why your speedometer might be shaking or fluctuating can be due to a problem with the cable sending the signals from your sensor to the ECU. Or it could be a problem with the sensor itself such as when it struggles to detect the moving gear or the magnet in the transmission.

What will a faulty speed sensor do?

With a faulty speed sensor, an electronic control unit within your car might fail to detect a transmission speed sensor signal. And this error can activate your car’s engine light. In such a situation, it’s best to take your car to a mechanic for an inspection.

How do you know if your transmission speed sensor is bad?

Common signs include harsh or improper shifting, cruise control not working, and the Check Engine Light coming on.