If your trunk or hatch no longer stays open, worn lift supports are usually the cause.
This guide explains how to replace trunk struts safely, what tools you need, and how to choose the right replacement parts.
What trunk struts do
Trunk struts, also called trunk lift supports, gas struts, or liftgate supports, hold the trunk lid, hatch, or rear gate open after you raise it.
They use pressurized gas and internal seals to provide controlled force, making it easier to access cargo areas without a prop rod.
When these parts wear out, the trunk may drop unexpectedly, resist opening, or fail to stay up in cold weather.
Because they are a simple but safety-critical component, replacing them promptly helps prevent pinched fingers, damaged hinges, and sudden falls.
Signs your trunk struts need replacement
Most failing trunk struts give clear warning signs before they stop working completely.
Watch for these symptoms:
- The trunk lid sags or will not stay open.
- The hatch falls quickly instead of lifting smoothly.
- Opening force feels weak or inconsistent.
- The struts make hissing sounds or show oil residue.
- Support performance gets worse in cold temperatures.
- The trunk opens unevenly on one side.
If your vehicle has two struts and only one appears weak, replace both at the same time.
Matching parts wear at a similar rate, and replacing both helps restore balanced support.
Tools and parts you will need
Replacing trunk struts is usually a straightforward DIY job.
Gather the following before you begin:
- Replacement trunk struts matched to your vehicle year, make, and model
- Flat-head screwdriver or small trim tool, if needed
- Clean gloves
- Safety glasses
- Step stool or helper, if the trunk is large or heavy
Some vehicles use clip-on sockets, while others use ball-and-socket mounts with retaining clips.
Always inspect the old strut ends before buying replacements, because the mounting style must match exactly.
How to replace trunk struts
Most trunk struts can be replaced in minutes, but the trunk must be supported securely the entire time.
Never rely on the old struts alone while one side is disconnected.
1. Open and support the trunk
Raise the trunk or hatch fully.
If the old struts are weak, have a helper hold it in place or use a prop rod, ladder support, or another stable method approved for your vehicle.
Make sure the lid cannot fall while you work.
2. Locate the mounting clips or sockets
Each strut is attached at both ends, usually with a ball stud and retaining clip.
Some use plastic covers that must be lifted before the clip can be accessed.
Look closely at how the old strut is oriented so you can install the new one the same way.
3. Remove the retaining clip
Use a small flat-head screwdriver or trim tool to gently pry the metal spring clip outward just enough to release the socket.
Do not remove the clip completely unless the design requires it.
Once loosened, the socket should slide off the ball stud with light pressure.
4. Detach one end of the old strut
Start with the upper or lower end, depending on what gives you the safest access.
Support the trunk firmly, then pull the socket away from the ball stud.
Repeat for the second end if you are removing the old strut entirely.
5. Install the new trunk strut
Align the new strut in the same direction as the old one.
Most lift supports have a rod and a cylinder end, and the orientation can matter depending on the manufacturer’s instructions.
Press the socket onto the ball stud until it snaps into place.
6. Reinstall or confirm the clip position
Make sure each retaining clip is seated correctly.
A loose clip can allow the socket to pop off unexpectedly, especially when the trunk is opened or closed repeatedly.
7. Test the trunk movement
Slowly close and reopen the trunk several times.
It should lift smoothly, stay open securely, and close without binding.
If the trunk still feels weak or uneven, verify that both struts are new, properly seated, and correctly matched to the vehicle.
How do you know if the replacement struts are correct?
Choosing the right replacement is essential because trunk struts are calibrated for specific load requirements.
A part that is too weak will not hold the lid open, while one that is too strong can make the trunk difficult to close or stress the hinges.
Check the following details before installing:
- Year, make, and model compatibility
- Exact body style, such as sedan, hatchback, SUV, wagon, or crossover
- Mounting style and end fittings
- Extended length and compressed length
- Force rating, often listed in newtons
If the original part number is still readable, use it to cross-reference an exact replacement through the manufacturer, dealer catalog, or a reputable aftermarket supplier.
Common mistakes to avoid
Even simple lift support replacement can go wrong if the trunk is not secured or the wrong part is installed.
Avoid these errors:
- Working without properly supporting the trunk lid
- Buying struts based only on vehicle appearance instead of exact fitment
- Installing one new strut and leaving one worn one in place
- Forcing the socket instead of aligning it with the ball stud
- Damaging the retaining clip during removal
- Ignoring leaking oil, bent rods, or worn hinge hardware
If the trunk still does not stay open after replacement, the issue may be more than the struts.
Check for damaged hinges, added cargo weight, aftermarket spoilers, or a rear liftgate that uses electronic strut assistance instead of standard gas supports.
Can you replace trunk struts yourself?
Yes, in most cases this is a beginner-friendly DIY repair.
Standard trunk struts usually require no special tools, no fluid drainage, and no computer reset.
The most important part is maintaining safe support while one side is disconnected.
Vehicles with power liftgates, integrated sensors, or hydraulic systems may require different procedures.
In those cases, consult the owner’s manual or a repair database such as AllData, Mitchell 1, or a factory service guide before starting.
How long trunk struts usually last?
Trunk lift supports typically last several years, but lifespan varies with climate, usage, and exposure to heat or road salt.
Cold weather, repeated opening cycles, and long-term sun exposure can accelerate seal wear and reduce gas pressure.
If your vehicle is older and the trunk struts have never been replaced, weak support is common even if the rest of the trunk hardware looks fine.
Many drivers notice the first signs of failure before the struts are completely dead, which is the best time to replace them.
When to inspect related hardware
After replacing the struts, inspect the surrounding hardware for other wear points that can affect trunk function:
- Ball studs and mounting brackets
- Hinges and hinge bushings
- Latch and striker alignment
- Rubber bump stops
- Wiring harnesses near the hinge area
If the trunk opens unevenly or closes with excess resistance, one of these components may be contributing to the problem.
A clean, properly aligned trunk assembly helps the new struts work as designed.
Where to find reliable replacement parts
Reliable trunk struts are available from dealership parts departments, OEM suppliers, and established aftermarket brands.
Look for parts with clear fitment data, force ratings, and a warranty.
Customer reviews can help, but exact vehicle compatibility should always come first.
For best results, match the replacement to the original configuration rather than choosing a universal part.
Trunk and liftgate support geometry varies widely across automakers such as Toyota, Honda, Ford, Chevrolet, Subaru, BMW, and Mercedes-Benz, so exact fit matters more than brand alone.