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Car with lock symbol: What does it mean & what to do

This article explains the meaning of the car with lock symbol on your dashboard, its connection with the immobiliser or anti-theft system, common causes such as key fob or battery issues, and how to fix or prevent the problem. It also highlights why a key replacement add-on cover in your car insurance is useful for such cases.

  • 15 Dec 2025
  • 5 min read
  • 6 views

Your car’s dashboard has several symbols and the appearance of a car with a lock icon can cause concern. This light means your vehicle’s anti-theft system is on guard. While it’s helpful for security, a car with the lock symbol on your dashboard may flash for other reasons as well. Understanding what this symbol means and how to fix common problems will help you keep your car safe and avoid getting stuck.

What does a car with a lock symbol mean?

A car with a lock symbol means the anti-theft system, called an immobiliser, is active. This immobiliser prevents the engine from starting until the correct key or key fob is used. 

The car with a lock symbol appears near the speedometer on the dashboard. However, its actual position may vary depending on the make and model of your car. In some vehicles, the immobiliser symbol can look like a padlock. It lights up when the anti-theft system is active or detects an issue. This system prevents theft by ensuring only authorised keys can start the engine.  Modern anti-theft technology has evolved a lot; these systems can even send alerts to your smartphone or help track your car’s location.

Common reasons why the car with a lock symbol appears

Several reasons may cause the car lock icon to appear. Let's check a few of the common ones:

  • Key fob battery is dead: If it has drained, it can’t send the correct signal to the car.
  • Weak or dead car battery: When the car battery is low, the immobiliser may fail to read the key code.
  • Damaged lock or ignition: Wear and tear or attempted tampering can confuse the locking system.
  • Faulty key chip: Sometimes, the small chip inside the key stops working.
  • Using the wrong key: Valet or spare keys may not have full access authorisation.

What to do when you see a car with a lock symbol

If a car symbol with a lock appears, you can try replacing the key fob battery, using the physical key to unlock and start the car or resetting the anti-theft system by turning the ignition to the “ON” position without starting the engine. If the issue continues, go to a mechanic for further help.

Resolving issues with your car with a lock symbol

Here are key points for resolving issues with your car when the lock and car symbol appear:

  • You must check and replace the key fob battery if it is dead.
  • Use the physical key to unlock and start the car.
  • Reset the anti-theft system by turning the ignition to “ON” without starting the engine, then turn off and restart.
  • Inspect your car locks for damage or tampering.
  • Try considering key reprogramming or replacement if the chip inside is faulty.

When to visit a professional mechanic?

If none of the above-mentioned steps work and the car and lock symbol on the dashboard stays on, you should take your car to a mechanic or your car’s official service centre. They can check your immobiliser, key fob chip and ECU for errors. Sometimes, a simple software update or reprogramming of the key can fix the problem for good.        

Preventing car with lock symbol issues in the future

A little routine care can prevent these issues from coming back.

  • Replace your key fob battery regularly.
  • Keep a spare battery in your glove box; it can save the day.
  • Avoid dropping your car key or fob, which can damage the chip inside.
  • Service your car locks if you notice stiffness or resistance.
  • Ensure the car and the fob batteries stay charged, especially before long trips.

Conclusion

The car with the lock icon on your dashboard shows that your car’s security system is active, which prevents vehicle theft. The symbol can also appear due to minor issues, such as a weak battery or a faulty key.  Fixing the problem quickly can prevent bigger repairs and secure your vehicle.

To stay prepared for such situations, consider adding a key replacement add-on cover to your comprehensive car insurance. It reimburses the cost of replacing damaged keys. You can compare different car insurance online and buy the one ideal for your needs.

FAQs

1. What should I do if the car with the lock symbol won’t go off?

Try replacing your key fob battery, use the physical key to unlock, reset the system by turning the ignition on before or without starting the engine or visit a mechanic if problems persist.

2. Can a dead key fob battery cause the lock symbol?

A dead battery in your key fob is a common reason the immobiliser system thinks the key is unauthorised.

3. Should I get car insurance if my car has an immobiliser?

Even if your car is equipped with an immobiliser or other advanced security systems, you still need car insurance. However, only a comprehensive policy can fully protect your vehicle, as third-party car insurance provides financial protection against damages or losses caused to others.

 


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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