How to Check Sway Bar Link for Trunk Opening Issues

Most people think of the sway bar link as a suspension part that has nothing to do with their trunk. But in certain vehicles especially older sedans and some SUVs a worn or damaged sway bar link can interfere with trunk operation. If your trunk won't open, sticks halfway, or the latch feels jammed, the sway bar link might be the unexpected culprit. Knowing how to check this part can save you a trip to the mechanic and help you solve a frustrating problem fast.

What does a sway bar link have to do with my trunk not opening?

A sway bar link connects the sway bar (also called an anti-roll bar) to the suspension. Its main job is to reduce body roll during turns. In some vehicle designs, the sway bar link sits close to the rear trunk area. When the link wears out, bends, or breaks, the loose end can shift into the path of trunk components specifically the trunk latch mechanism or the trunk release cable. This physical interference can prevent the trunk from opening properly or cause the latch to misalign.

It sounds odd, but it's a real issue that mechanics see on certain makes and models. If you've already checked the trunk latch, release cable, and lock actuator without finding a problem, a closer look at the sway bar link is worth your time.

How do I know if a bad sway bar link is causing my trunk issue?

Before you grab your tools, look for these common signs that point to the sway bar link as the source of the trunk problem:

Clunking or rattling sounds from the rear of the vehicle when driving over bumps this is the classic sign of a worn sway bar link.
Trunk opens intermittently sometimes it works, sometimes it doesn't, which can suggest a loose component shifting around and blocking the mechanism.
Trunk latch feels physically blocked rather than electrically dead. If the lock actuator clicks but the trunk won't release, something may be in the way.
Visible sagging or misalignment under the rear of the car near the trunk area.
You notice the remote trunk release stopped working around the same time the suspension started making noise.

If more than one of these applies to your situation, the sway bar link is a strong suspect. You can read more about remote trunk release failures tied to sway bar problems for additional context.

What tools do I need to check the sway bar link?

You don't need anything fancy. Most of this inspection can be done in your driveway with basic hand tools:

Jack and jack stands (or a vehicle ramp)
Wheel chocks
Flashlight or work light
Socket set and wrenches (commonly 14mm or 17mm, but varies by vehicle)
Pry bar or large flathead screwdriver
Gloves and safety glasses

How do I physically inspect the sway bar link step by step?

Step 1: Secure the vehicle

Park on a flat, level surface. Engage the parking brake and place wheel chocks around the front wheels. If using a jack, lift the rear of the vehicle and place jack stands under the frame or designated jack points. Never work under a car supported only by a jack.

Step 2: Locate the sway bar link

Look under the rear of the vehicle near the wheels. The sway bar is a U-shaped metal bar that runs across the axle. The sway bar link is the smaller vertical or angled rod that connects each end of the sway bar to the suspension strut or control arm. On most cars, there's one link on each side.

Step 3: Check for visible damage

Use your flashlight and look for these problems:

Bent or broken link a visibly crooked rod that could be pushing against nearby trunk components
Torn or missing rubber bushings the rubber boots at each end of the link that cushion the joint
Rust and corrosion heavy rust can weaken the link and cause it to break or shift position
Loose or missing nuts the fasteners at the top and bottom of the link

Step 4: Test for play and movement

Grab the sway bar link with your hand and try to wiggle it. A healthy link should feel tight with almost no free play. If you can move it side to side easily, or if you hear a clunk when you push and pull on it, the internal ball joint or bushing is worn out. This excessive movement can allow the link to shift into areas it shouldn't like the space where your trunk latch operates.

Step 5: Check the clearance around the trunk area

With the vehicle still raised, look at the relationship between the sway bar link and the trunk latch mechanism or release cable. Is there physical contact? Is the link resting against or very close to any trunk hardware? Even a small amount of interference can prevent the trunk from opening. Pay special attention if the link appears bent even a slight bend can change its arc of travel enough to create a problem.

Step 6: Test the trunk while watching the link

If it's safe to do so, have someone press the trunk release (or use the remote) while you watch the sway bar link area from underneath. You might be able to see the link shift or the trunk latch attempt to move and get blocked. This hands-on test gives you a real-time view of the interference, if any exists.

What are the most common mistakes people make when checking this?

A few things trip up DIYers during this inspection:

Only checking one side. Sway bar links come in pairs. If one is bad, the other is likely close behind. Check both sides.
Not loading the suspension. If the vehicle is fully jacked up with wheels hanging free, the sway bar position changes. This can hide the interference that only happens at normal ride height. Try to inspect with the suspension loaded (on ramps) or at least check again once the car is lowered.
Assuming the trunk problem is electrical. Many people spend time testing fuses, wiring, and the actuator when the real problem is a physical obstruction from a bent link. Don't skip the mechanical inspection.
Ignoring minor wear. A sway bar link doesn't need to be fully broken to cause trunk issues. Even slightly worn bushings can allow enough movement to create a problem.

Can I fix a sway bar link that's blocking my trunk?

Yes, and the fix is usually straightforward. If the sway bar link is the problem, replacing it is the most reliable solution. Sway bar links are not expensive parts typically $15 to $50 each for most vehicles and the labor is manageable for someone with basic mechanical skills.

Remove the wheel on the affected side for better access.
Use a socket and wrench to remove the nuts at the top and bottom of the link.
If the stud spins freely (common on worn links), you may need to hold the stud with a hex key or Allen wrench while turning the nut.
Remove the old link and compare it to the replacement to confirm fitment.
Install the new link with the nuts torqued to manufacturer specifications (check your vehicle's service manual).
Reinstall the wheel, lower the vehicle, and test the trunk operation.

After replacing the link, the trunk should operate normally if the link was indeed the cause. If the trunk still won't open, the problem may involve the trunk latch mechanism itself or another related component.

When should I take my car to a professional?

Consider going to a mechanic if any of these apply:

You're not comfortable working under a vehicle safely.
The sway bar link bolts are seized from rust and won't come off.
You've replaced the link and the trunk still doesn't work this points to a deeper issue with the latch, cable, or lock assembly.
You're not sure whether the link is actually interfering with the trunk mechanism. A shop with a lift can inspect this more thoroughly.

Quick checklist: Is my sway bar link causing trunk problems?

Use this checklist to narrow things down:

✅ Listen for rear suspension clunking over bumps
✅ Visually inspect both sway bar links for bending, rust, or broken bushings
✅ Wiggle each link by hand to check for excessive play
✅ Look for physical contact between the link and trunk latch or release cable
✅ Test trunk operation with the suspension loaded (not fully extended)
✅ Have someone trigger the trunk release while you observe from underneath
✅ If the link is bad, replace it and retest the trunk immediately
✅ If the trunk still fails after link replacement, investigate the latch, cable, and actuator

Tip: Take photos of the sway bar link position before removing it. This gives you a reference for how the new one should sit and helps you compare old vs. new side by side. If you notice the old link was visibly out of position compared to the new one, that's a strong confirmation it was the root cause of your trunk problem.