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2018 Mazda CX-5 Rear Hatch Not Staying Up

By ClearTheCode · Published 2026-05-31 · ~5 min read

Is your 2018 Mazda CX-5 rear hatch not staying up? Learn common causes, how to diagnose weak liftgate struts, and cost-effective fixes to restore functionality.

At a glance

Difficulty
6/10 — Moderate
Est. repair cost
$100 – $900 (parts + typical shop labor)
OEM tooling
Standard OBD-II scanner and hand tools
Common symptoms
  • The rear hatch slowly drifts downward after being opened
  • requiring you to hold it up manually.
  • The hatch falls quickly and unexpectedly
  • posing a safety risk.
  • It requires noticeable extra effort to lift the hatch to its full open position.
  • The hatch does not extend to its full open height

There's nothing more frustrating than trying to load groceries or gear into your 2018 Mazda CX-5, only for the rear hatch to slowly, or suddenly, fall back down. This common issue, where the liftgate or manual hatch fails to stay open on its own, is not only an inconvenience but can also be a safety hazard. It typically points to a problem with the gas-charged lift supports, often called struts, that are designed to hold the hatch securely in the open position.

What drivers notice on this 2018 Mazda CX-5

Drivers of a 2018 Mazda CX-5 experiencing this problem will quickly notice the rear hatch losing its ability to remain open without manual support. This can manifest as the hatch slowly drifting downwards after being opened, or in more severe cases, immediately falling back down once released. This can make simple tasks like loading cargo or accessing the spare tire cumbersome and potentially dangerous, as the hatch could strike an unsuspecting individual or damage items.

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

  • Difficulty Rating: 6/10 — Moderate
  • Common Symptoms: The rear hatch slowly drifts downward after being opened, requiring you to hold it up manually.; The hatch falls quickly and unexpectedly, posing a safety risk.; It requires noticeable extra effort to lift the hatch to its full open position.; The hatch does not extend to its full open height, even when fully unlatched.
  • 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 rear hatch isn't performing as it should, look out for these specific symptoms:

  • The rear hatch slowly drifts downward after being opened, requiring you to hold it up manually.
  • The hatch falls quickly and unexpectedly, posing a safety risk.
  • It requires noticeable extra effort to lift the hatch to its full open position.
  • The hatch does not extend to its full open height, even when fully unlatched.
  • For models with a power liftgate, the motor may struggle, sound strained, or the hatch may not complete its opening cycle smoothly.
  • Visible signs of wear on the struts, such as rust, pitting on the rod, or fluid leaks.

How to verify and confirm the issue

Verifying that weak liftgate struts are the culprit on your 2018 Mazda CX-5 is straightforward:

  • Manual Test: Carefully open the rear hatch to its full extent. Once open, release your grip and observe if it sags, drifts downward, or falls. A healthy strut system will hold the hatch firmly in place.
  • Visual Inspection: Examine the gas-charged struts on both sides of the hatch. Look for any signs of damage, such as bent rods, rust, or fluid leaks around the seals. A greasy or oily residue on the strut body indicates a failing seal, allowing gas to escape.
  • Listen for Noises: As you open and close the hatch, listen for any unusual creaking, groaning, or grinding noises, especially if your CX-5 has a power liftgate system. While not always indicative of strut failure, it can point to related issues.
  • Compare Strut Strength: If you have access to a known good 2018 Mazda CX-5, compare the effort required to open and hold the hatch. This can give you a baseline for comparison.

Common causes (most likely first)

The primary reason a 2018 Mazda CX-5 rear hatch won't stay up is typically related to the lift supports:

  • Worn or Failed Gas-Charged Lift Supports/Struts: Over time, the internal seals in these struts degrade, allowing the pressurized gas to escape. This loss of pressure means the struts can no longer support the weight of the hatch. This is by far the most common cause.
  • Cold Weather: Extremely cold temperatures can temporarily reduce the effectiveness of the gas within the struts, making them less capable of holding the hatch up.
  • Damage to Strut Mounting Points: While less common, physical damage to where the struts attach to the vehicle body or the hatch itself can compromise their function.
  • **Power Liftgate Motor/Actuator Issues (less common for

This guide is not a substitute for OEM service procedures; use a qualified technician for safety-critical repairs.

Frequently asked questions

How urgent is this problem?

If symptoms are worsening or safety systems are affected, diagnose soon; minor issues can often wait for a scheduled service visit.

Can I drive with this issue?

Short trips may be acceptable for some faults, but stop driving if you notice overheating, loss of braking, steering problems, or strong fuel smells.

Do I need a dealer scan tool?

A basic OBD-II scanner helps confirm codes; some steps still need visual checks and meter tests described above.

Helpful links

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