How to Fix a Car Trunk Key That Doesn't Go All the Way in the Lock

Many times a small hammer is all that is needed.

When the key for your trunk lock is inserted into the lock, a series of small pins are pushed up or down in the tumbler in the lock. This combination of pin positions allows the key to be turned and the trunk to open.The most common cause of a trunk lock that won't allow the key to be inserted completely is a stuck pin in the tumbler assembly. This is usually easy to overcome but a new trunk lock should be installed when the trunk is finally opened to prevent a complete lock failure from requiring an expensive repair.

Things You'll Need

• Penetrating oil
• Small hammer

Instructions

1. Spray penetrating oil liberally into the lock tumbler. Allow it to sit for a few minutes so the oil can soak into the tumbler.

2. Spray a liberal coating of penetrating oil onto the key and into the tumbler. Insert the key as far as it will go into the tumbler.

3. Strike the end of the key with a sharp blow from the hammer to drive it into the tumbler. If it doesn't go in completely, remove the key and repeat step 1. If it does go in completely, turn the key and open the trunk. It may take several attempts to free up the sticking lock enough for the key to work.

4. Repeat if needed.