2018 Mazda CX-5 Power Liftgate Not Staying Open: Fix Weak Struts

Experiencing issues with your 2018 Mazda CX-5 power liftgate not staying open can be more than just an inconvenience; it can be a safety concern. Whether it's slowly drifting down, refusing to hold its position, or closing unexpectedly, a failing liftgate often points to weak or worn-out support struts. This common problem affects many vehicles as they age, and while the CX-5 features a power-assisted liftgate, the underlying support mechanism still relies on gas-charged struts to hold it up once opened.

What drivers notice on this 2018 Mazda CX-5

Drivers of the 2018 Mazda CX-5 often first notice a subtle change in the liftgate's behavior. It might not open as quickly or smoothly as it once did, or it may hesitate at its fully open position before slowly starting to descend. Over time, this can worsen to the point where the liftgate simply won't stay open on its own, requiring manual propping or constant supervision when loading or unloading cargo. This issue is particularly noticeable in colder weather, as the gas in the struts can become less effective.

At a glance: difficulty, repair cost, and diagnostic workflow

• Difficulty Rating: 6/10 — Moderate
• Common Symptoms: The liftgate slowly drifts downward after being fully opened.; It requires manual force to keep it in the open position.; The liftgate closes unexpectedly, posing a safety risk.; It opens or closes much slower than usual, even with power assist.
• Estimated Repair Cost: $100–$900 (parts + typical shop labor)
• OEM Tooling Required: Standard OBD-II scanner and hand tools

Diagnostic workflow:

1. Confirm the symptom on your vehicle.
2. Scan for stored or pending codes with an OBD-II tool.
3. Inspect the most common causes in this guide (visual checks first).
4. Run verification tests before replacing parts.
5. Repair, clear codes, and verify on a test drive.

Symptoms and warning signs

If your 2018 Mazda CX-5's power liftgate isn't behaving as it should, pay attention to these common symptoms:

• The liftgate slowly drifts downward after being fully opened.
• It requires manual force to keep it in the open position.
• The liftgate closes unexpectedly, posing a safety risk.
• It opens or closes much slower than usual, even with power assist.
• A squeaking or groaning noise might be heard when the liftgate operates, indicating friction or failing components.
• The power liftgate system may attempt to cycle repeatedly, struggling to find its open or closed position.

How to verify and confirm the issue

Verifying that weak liftgate struts are the cause of your 20218 Mazda CX-5's power liftgate problems is relatively simple:

• Manual Lift Test: With the power liftgate disabled or manually opened, try to hold it up with one hand. If it feels unusually heavy or immediately starts to fall, the struts are likely weak.
• Visual Inspection: Look for any signs of fluid leakage around the strut shafts. A thin film of oil or grime can indicate a failing seal, allowing gas pressure to escape. Also, check for any bending or physical damage to the strut body.
• Temperature Effect: Note if the problem is worse in cold weather. Cold temperatures reduce the pressure of the gas inside the struts, making their weakness more apparent.
• Listen for Noises: Pay attention to any hissing sounds when the liftgate moves, which could indicate a gas leak from the strut.

For more general diagnostic help, you can always refer to our All repair guides section.

What is different on this year and model

The 2018 Mazda CX-5 features a power liftgate system, which adds a layer of complexity compared to a purely manual liftgate. While the power motor assists in the opening and closing motion, gas-charged struts are still critical for holding the liftgate in its open position. The power system often includes sensors and a control module that can detect resistance or improper movement. If the struts are too weak, the power motor might struggle, potentially leading to error codes or the system attempting to compensate, which can put strain on the motor itself. However, the fundamental role of the struts as a physical support remains unchanged.

Common causes (most likely first)

The primary reason your 2018 Mazda CX-5's power liftgate isn't staying open is almost always due to worn-out gas-charged struts. Here's why:

• Age and Wear: Over time, the seals inside the struts can degrade, allowing the pressurized gas to escape. This is the most common cause of strut failure.
• Temperature Fluctuations: Extreme cold can temporarily reduce the effectiveness of the gas pressure within the struts, making them feel weaker.
• Frequent Use: Constant opening and closing cycles contribute to the wear and tear on the internal components of the struts.
• Contamination/Damage: Physical damage to the strut shaft (e.g., from dirt, scratches, or impacts) can compromise the seals and lead to premature failure.

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Step-by-step diagnosis and fixes

Here’s how to diagnose and fix weak liftgate struts on your 2018 Mazda CX-5:

1. Safety First: Ensure the liftgate is securely propped open before working underneath it. A broom handle or a sturdy piece of wood can work, but be cautious. It's best to have a second person hold the liftgate.
2. Locate the Struts: The liftgate struts are typically located on either side of the liftgate opening, connecting the liftgate to the vehicle body.
3. Inspect Strut Connections: Each end of the strut is usually held in place by a ball joint and a clip. Use a small flathead screwdriver or a pry tool to carefully pry up the retaining clip at one end of the strut.
4. Remove the Old Strut: Once the clip is disengaged, gently pull the strut end off the ball joint. Repeat for the other end. The liftgate will become heavier, so ensure it's well-supported.
5. Install New Strut: Align the new strut with the ball joints. Push the strut ends firmly onto the ball joints until they click into place. The retaining clips should automatically engage, but double-check their security.
6. Test Operation: After both new struts are installed, carefully remove your prop or release the liftgate. Test the power liftgate function. It should now open smoothly and stay securely in the open position.

For general information on vehicle parts, you can Browse vehicles to find your specific model.

Repair options and cost factors

Replacing the liftgate struts on your 2018 Mazda CX-5 is a relatively inexpensive repair, whether you do it yourself or have a professional handle it.

• DIY Replacement: The cost for a pair of aftermarket liftgate struts typically ranges from $40 to $150. OEM (Original Equipment Manufacturer) struts may cost more, from $80 to $250. This is the most cost-effective option if you're comfortable with basic hand tools.
• Professional Replacement: If you opt for a shop, expect to pay for parts plus 0.5 to 1 hour of labor. Total costs could range from $100 to $300, depending on the shop's labor rate and the parts used. While the job is simple, shops still charge for their time and expertise.

Consider checking out the Mazda vehicle hub or the CX-5 model hub for more specific information on your vehicle.

When to see a professional

While replacing liftgate struts is a common DIY task, there are situations where professional help is advisable:

• Uncertainty or Lack of Tools: If you're not comfortable working on your vehicle or lack the necessary basic hand tools, a professional can ensure the job is done correctly and safely.
• Persistent Issues: If replacing the struts doesn't resolve the power liftgate problem, there might be an underlying electrical or mechanical issue with the power liftgate motor, control module, or sensors. A professional can diagnose these more complex problems.
• Safety Concerns: If the liftgate is completely unresponsive or poses an immediate safety risk, it's best to have a professional technician assess the situation.

Frequently asked questions

Can weak struts damage the power liftgate motor on my 2018 Mazda CX-5?

Yes, weak struts can put additional strain on the power liftgate motor. The motor is designed to assist in opening and closing, but if the struts aren't providing adequate support, the motor has to work harder to hold the liftgate open or lift it against gravity, potentially leading to premature wear or failure of the motor components.

How long do liftgate struts typically last on a 2018 Mazda CX-5?

Liftgate struts on a 2018 Mazda CX-5 typically last between 5 to 10 years, or around 100,000 to 150,000 miles, depending on usage and environmental conditions. Frequent use, extreme temperatures, and exposure to dirt and grime can shorten their lifespan, while less frequent use in moderate climates can extend it.

Are aftermarket liftgate struts as good as OEM for the 2018 Mazda CX-5?

Many aftermarket liftgate struts are of comparable quality to OEM parts and often come at a lower cost. When choosing aftermarket, look for reputable brands with good reviews, as quality can vary. OEM struts are engineered specifically for your Mazda CX-5, ensuring a perfect fit and performance, but a good quality aftermarket option can be a reliable and more budget-friendly alternative.

Sources and further reading

• All repair guides
• Browse vehicles
• Browse OBD-II codes
• Mazda vehicle hub
• CX-5 model hub

This information is for educational purposes and is not a substitute for OEM service procedures; always use a qualified technician for safety-critical work.

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