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Speedometer not working: Symptoms, causes, & fixes

This article outlines the signs of a malfunctioning speedometer, common causes like sensor or ECU failure, and practical fixes. It also stresses the importance of diagnosing issues and testing repairs after fixes.

  • 13 May 2025
  • 3 min read
  • 2 views

On the road, have you ever looked down at your monitor and found your speedometer not working? This isn't just a bother; it can also be dangerous and get you in trouble if you get caught speeding without meaning to.

Symptoms of the speedometer not working

There are a few signs that your car speedometer not working right:

  • A dashboard indicator that is dead
  • Your check engine light is glowing unexpectedly
  • wrong or changing speed numbers
  • Speed measures that are always wrong

Causes of the speedometer not working

Modern cars use complex methods to measure speed, and several components could be at fault if the speedometer stop working:

  • Faulty Speed Sensor: This small but important component doesn't just control your speedometer—it also helps with cruise control and handles fuel flow and spark timing.
  • ECU Problem: Your car's "brain" is called the Engine Control Unit, and it controls many processes, such as setting the speed limit. If it fails, your speedometer might show wrong numbers.
  • Electrical Issues: In older cars, worn wires or burst fuses often cause speedometer problems.
  • Tire Size Changes: Interestingly, if you've put larger-than-recommended tires, your speedometer might show wrong numbers since it's set for original tire measurements.

Fixes for the speedometer not working

Fixing a non-working indicator usually requires:

  • Diagnostic Testing: Use a code reader to find specific error codes and spot the failed component.
  • Sensor Replacement: If the speed sensor is broken, it must be replaced.
  • Wiring Repair: Check for broken or shorted wires and repair them if necessary.
  • ECU restart or Replacement: For ECU problems, a restart might provide a partial answer, but replacement may be necessary for lasting fixes.

After any fix, be sure to test drive your car to confirm the speedometer is working properly.

FAQs

  1. Is it dangerous to drive with a non-working speedometer?

Yes, without exact speed information, you risk unknowingly breaking speed limits, which can lead to crashes and traffic fines. 

  1. Does car insurance cover speedometer repairs?

This depends on your policy. Comprehensive coverage may cover electrical system breakdowns. Check with your insurance company for detailed policy information.

Conclusion

Remember that regular repair can help avoid speedometer breakdowns. In addition to timely repairs, buying car insurance online adds an extra layer of protection. Comprehensive car insurance, with the right add-ons, can provide crucial safety when dealing with vehicle issues like speedometer failures, among other things.


 

Disclaimer: The information provided in this blog is for educational and informational purposes only. It may contain outdated data and information regarding the topic featured in the article. It is advised to verify the currency and relevance of the data and information before taking any major steps. ICICI Lombard is not liable for any inaccuracies or consequences resulting from the use of this outdated information.

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