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Why does my car not lock when I lock it?


Having trouble locking your car can be frustrating and inconvenient, especially when you're in a hurry or concerned about security. At Kevin's Autos, we’ve seen this issue countless times, and it can stem from a variety of causes. In this article, we’ll explore the most common reasons why your car might not lock and provide guidance on what you can do to resolve the problem.


1. Dead Key Fob Battery


One of the most common reasons your car won’t lock is a dead or weak battery in your key fob. Modern cars rely on key fobs to send signals to the car’s locking system. If the battery is depleted, the signal may not reach the car.



  • Solution: Replace the key fob battery. Most key fobs use small coin-cell batteries, which are inexpensive and easy to replace.

  • Tip: Check your car’s manual for instructions on how to open the key fob and replace the battery.


2. Faulty Key Fob


If replacing the battery doesn’t solve the issue, the key fob itself might be malfunctioning. This could be due to internal damage, wear and tear, or a manufacturing defect.



  • Solution: Test the key fob by using a spare, if available. If the spare works, the original fob may need to be repaired or replaced.

  • Tip: Visit a professional auto repair shop to have the key fob inspected and reprogrammed if necessary.


3. Problems with the Car’s Locking System


Sometimes, the issue lies within the car’s locking system rather than the key fob. This could include problems with the door lock actuators, wiring, or the central locking module.



  • Solution: Listen for a clicking sound when you attempt to lock the car. If you don’t hear it, the actuator may be faulty and require replacement.

  • Tip: A professional mechanic can diagnose and repair issues with the locking system.


4. Blown Fuse


Your car’s locking system relies on electrical components, including fuses. A blown fuse can disrupt the system and prevent the locks from functioning properly.



  • Solution: Check your car’s fuse box for a blown fuse related to the locking system. Replace it with a fuse of the same rating.

  • Tip: Refer to your car’s manual to locate the correct fuse and ensure proper replacement.


5. Interference or Signal Blockage


In some cases, external interference can block the signal between your key fob and the car. This might happen in areas with high radio frequency interference or if the key fob is too far from the car.



  • Solution: Move closer to the car and try again. Avoid areas with known signal interference.

  • Tip: Keep your key fob away from other electronic devices that might cause interference.


6. Mechanical Issues with the Door Lock


If your car’s locks are not functioning manually either, there may be a mechanical issue with the door lock itself, such as a jammed or broken component.



  • Solution: Inspect the door lock for visible damage or debris. Lubricate the lock with a silicone-based lubricant if it appears stuck.

  • Tip: If the problem persists, consult a professional to repair or replace the lock mechanism.


When to Seek Professional Help


If you’ve tried the above solutions and your car still won’t lock, it’s time to consult a professional. At Kevin’s Autos, we specialize in diagnosing and repairing car locking systems. Whether it’s a key fob issue, electrical problem, or mechanical failure, our experienced technicians can get your car back to working order quickly and affordably.


Don’t let a malfunctioning lock compromise your car’s security. Contact us today to schedule an appointment and let us take care of the problem for you!


Frequently Asked Questions

Why is my car not letting me lock it?


If the problem persists after replacing the battery, the key fob itself could be defective and require replacement. If only one door is not locking while others usually operate, a blown fuse could be the culprit. Replacing the fuse is a relatively inexpensive fix that can restore the functionality of the affected door.



Why is my car locking system not working?


A faulty central locking system might be due to several reasons, such as a blown fuse, faulty solenoid, or electrical wiring issues. Also, it's good to remember the fault might not be with the central car locking system but the key fob instead; over time, fobs require battery changes.



How do I make my car lock automatically?


Now select the back icon. And press then scroll to Auto door unlock and push in to check out your options. The first three are pretty self-explanatory. All doors when driver's door opens.



Why did my car door stop locking?


Swapping out the old battery for a new one is often a quick and effective fix. Fuse Concerns: A malfunctioning car door lock could also be the result of a blown fuse. Inspect your vehicle's fuse box for any signs of damage and replace any compromised fuses accordingly.



Why is my car door lock not locking?


Wiring Problems: Damaged or corroded wiring in the door can disrupt the locking mechanism, particularly in older vehicles. Misalignment: If the door is misaligned, it may not lock properly. Check to see if the door closes fully and seals correctly. Frozen Lock: In cold weather, locks can freeze.



Why is my car not automatically locking?


An inoperative power door lock can be caused by the switch, solenoid, wiring problem or mechanical problem within the linkage of the affected door. The key fob battery is dead: This is one of the most common reasons why your car door lock is not working.



How much does it cost to fix a car that wont lock?


An assessment and repair of your car door lock can cost anywhere from $50 to $300, depending on the extent of the damage and the amount of labour it will require.



Why does my car not lock when I press the lock button?


Check if there are any visible obstructions or debris in the lock cylinder that could be preventing it from turning and locking properly. If you notice any debris, carefully remove it using a small tool or compressed air.



What causes the door lock not to lock?


Factors like the weather, damage to the key, and even a buildup of dirt and grime inside the locking mechanism can all stop a door from locking.



How much does it cost to replace a lock actuator?


The average cost for a Door Lock Actuator Replacement is between $325 and $384. Labor costs are estimated between $98 and $124 while parts are priced between $227 and $260. This range does not include taxes and fees, and does not factor in your unique location.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.