Trunk Lock Cylinder Replacement Cost

Know what price you should pay to get your vehicle fixed.

The average cost for a trunk lock cylinder replacement is between $141 and $166. Labor costs are estimated between $45 and $58 while parts are priced between $96 and $108. Estimate does not include taxes and fees.
Note about price: The cost of this service or repair can vary by location, your vehicle's make and model, and even your engine type. Related repairs may also be needed. Talk with a RepairPal Certified shop to learn which repairs might be right for you.

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What is a Decklid Lock Cylinder?

Vehicles with and without remote or keyless entry will have a lock on the trunk, which allows access to the trunk whether or not the interior or keyless trunk release functions. To keep this secure, a unique lock cylinder is installed into the trunk lid, and the key to the vehicle is only key that will turn that lock. This is certainly of no surprise, as this system has been in use for hundreds of years, yet automotive keys are often among the most advanced. Many modern vehicles will have an anti-theft sensor attached to the trunk lock cylinder, allowing the vehicle to confirm the key is correct for the vehicle.

How does the Decklid Lock Cylinder work?

When the key is placed into the lock, it moves small pins inside what is called a 'tumbler'. If the key is correct for that lock, the key will align the pins perfectly, allowing the door lock cylinder to turn. If the trunk has a sensor to read the key, the alarm will be disarmed, allowing the trunk to open without sounding the alarm. As the key is turning the lock cylinder, the lock cylinder is actuating the trunk latch, causing it to open. When the key is released, the latch can once again be closed, and will lock the trunk when the trunk lid is pressed down.

What are the symptoms of a bad Decklid Lock Cylinder?

If the key will no longer turn the lock cylinder, or the lock cylinder will not return to its resting position, it has likely failed, and requires replacement. Alternatively, the sensor which reads the key may fail, which would cause the alarm to sound every time the trunk is opened with the key while the vehicle is locked. Finally, you may find that the key cannot be inserted into the lock, or it may be stuck in the lock. These conditions are typically both associated with a need for lubrication, but it could indicate that the lock cylinder is faulty.

Can I drive with a bad Decklid Lock Cylinder?

The lock cylinder will typically not render a vehicle useless, and the length of time between failure and repair will typically depend on the preference of the vehicle's owner. If the anti-theft module does not recognize the key, the alarm will sound and the immobilizer will be activated every time the trunk is opened with the key. This may be irritating enough that the owner would change the lock cylinder even if the remote or electrical lock functions normally.

How often do Decklid Lock Cylinders need replacement?

Lock cylinders fail fairly commonly, but mostly for higher mileage vehicles. Lock cylinders wear out in everything, houses, cars, diaries, padlocks, etc. There are many small parts in a lock cylinder, and when any one of those parts fails, the rest of the cylinder fails with it. Some vehicles are known for lock cylinder issues, but other makes and models suffer lock cylinder failure on an infrequent basis. Most vehicle's will never need the trunk lock cylinder replaced, but the position of the lock cylinder, and the climate the vehicle is operated in play a role.

How are Decklid Lock Cylinder issues diagnosed?

Lock cylinder diagnosis is apparent when attempting to perform any function with the key, but the function does not work. In explanation, the function may be turning the key, removing the key, installing the key, or keeping the key in. When any of these functions are lost, the key is evaluated as well, but the lock cylinder will likely be the culprit. Upon disassembly, the technician can verify the lock cylinder is functioning improperly.

How are Decklid Lock Cylinders replaced?

Depending on the location of the lock, replacement of the lock cylinder can be very difficult or very easy. In some cases, the inner trunk liner will need to be removed where it covers the lock, and generally that allows enough access to disconnect the the linkage from the lock to the latch, and remove the lock cylinder. However, most vehicles can have the trunk lock cylinder removed with relative ease, and without disturbing cover panels.

RepairPal Recommendations for Decklid Lock Cylinder issues

To prevent needing additional keys for your vehicle, an experienced locksmith can rekey the new trunk lock cylinder to match the existing key. This will prevent you from having a separate key for the doors and trunk.

What to look out for when dealing with Decklid Lock Cylinder issues

When the lock cylinder fails, removal can become difficult or impossible, and may require disassembly several components on/in the trunk. The lock may also have to be removed through destruction, and a trained professional should be used to prevent collateral damage.

Can I replace the Decklid Lock Cylinder myself?

A trunk lock cylinder can be replaced at home in most cases, however, if the trunk cannot be opened by any means, it is most prudent to trust a professional. If the trunk can be opened, the lock cylinder can be extremely simple, and the novice DIYer can tackle this task with basic instructions. Keep in mind that the lock cylinder must be keyed to the current vehicle key prior to installation, otherwise the locksmith will need to remove and reinstall the lock.

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