2018 BMW X5 Power Tailgate Not Working: Diagnosis & Fixes

Experiencing issues with your 2018 BMW X5 power tailgate not working can be frustrating and inconvenient. This common problem often manifests as the tailgate failing to open or close smoothly, dropping unexpectedly, or refusing to operate at all. For many BMW X5 owners, the convenience of a power tailgate is a key feature, and its malfunction can disrupt daily tasks, from loading groceries to accessing luggage.

What drivers notice on this 2018 BMW X5

Drivers of the 2018 BMW X5 typically first notice the power tailgate acting erratically. It might open only partially, close with excessive force, or simply refuse to respond to commands from the key fob, interior button, or even the external release handle. In some cases, the tailgate might operate very slowly, making a grinding or straining noise, indicating that the lifting mechanism is struggling. The most concerning symptom is when the tailgate fails to hold its position and falls unexpectedly, posing a safety risk. This behavior is a strong indicator that the power tailgate struts, which provide the lifting and holding force, are failing.

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

• Difficulty Rating: 6/10 — Moderate
• Common Symptoms: The tailgate does not open or close completely.; The tailgate opens or closes much slower than usual.; The tailgate falls back down after being opened, failing to hold its position.; You hear unusual grinding, clicking, or whirring noises when the tailgate attempts to operate.
• 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

When the power tailgate system on your 2018 BMW X5 begins to fail, you might observe several distinct symptoms:

• The tailgate does not open or close completely.
• The tailgate opens or closes much slower than usual.
• The tailgate falls back down after being opened, failing to hold its position.
• You hear unusual grinding, clicking, or whirring noises when the tailgate attempts to operate.
• The tailgate is completely unresponsive to all control inputs (key fob, interior button, external handle).
• Warning messages related to the tailgate or trunk may appear on the iDrive screen.
• The soft-close function, if equipped, may also fail to engage properly.

How to verify and confirm the issue

To confirm that your 2018 BMW X5 power tailgate is indeed experiencing a problem, perform the following checks:

• Manual Operation Test: Carefully try to open and close the tailgate manually. If it feels excessively heavy, resists movement, or doesn't stay open on its own, the struts are likely weak or failed. Exercise caution, as a falling tailgate can cause injury.
• Visual Inspection of Struts: Open the tailgate as far as it will go (with assistance if needed) and visually inspect the power tailgate struts. Look for signs of fluid leaks, bent shafts, or damaged mounting points. Any visible damage or residue around the strut body suggests internal failure.
• Listen for Motor Activity: Attempt to operate the tailgate and listen closely for the sound of the electric motor. If you hear the motor whirring but the tailgate doesn't move or moves very little, it suggests a mechanical issue with the struts or gears rather than an electrical power supply problem to the motor itself.
• Check for Obstructions: Ensure there are no items physically blocking the tailgate's path or caught in the latch mechanism. Even a small obstruction can trigger the anti-trap safety feature, preventing full operation.
• Scan for Fault Codes: Connect an OBD-II scanner to your vehicle's diagnostic port. While a specific code might not always appear for a purely mechanical strut failure, issues with the tailgate control module or wiring often generate codes that can point to the root cause. Look for codes related to the "Trunk/Tailgate Module" or "Rear Electronic Module."

Common causes (most likely first)

The primary reasons your 2018 BMW X5 power tailgate might not be working typically involve these components:

• Failed Power Tailgate Struts: This is by far the most common culprit. Over time, the gas pressure inside the struts can diminish, or the internal electric motor and gears can wear out, leading to insufficient lifting force or inability to hold position.
• Wiring Harness Damage: The wiring that runs through the tailgate hinge area is subject to constant flexing. Over years of use, these wires can fray, break, or short circuit, interrupting power or communication to the tailgate components.
• Tailgate Control Module (TCM) Failure: The electronic module responsible for controlling the tailgate's operation can malfunction due to internal component failure, water intrusion, or software glitches. This can lead to erratic behavior or complete non-operation.
• Blown Fuses or Faulty Relays: While less common for the entire system to fail, a specific fuse or relay for the tailgate motor or control module can blow, cutting off power. Always check relevant fuses in the fuse box.
• Obstructions or Misalignment: Physical obstructions, even minor ones, can trigger safety mechanisms that prevent the tailgate from operating fully. Misalignment of the tailgate itself can also cause binding and prevent smooth movement.

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Step-by-step diagnosis and fixes

Addressing a non-functioning 2018 BMW X5 power tailgate requires a systematic approach:

• 1. Check Fuses: Locate the fuse box (often in the trunk or glove compartment) and identify the fuse(s) for the power tailgate or trunk. Inspect them for continuity and replace any blown fuses. Consult your owner's manual for exact fuse locations and ratings.
• 2. Inspect for Obstructions: Thoroughly check the tailgate's path and latch area for anything that might be blocking its movement. Clear any debris or objects.
• 3. Test Manual Operation: With caution, try to manually lift and lower the tailgate. If it feels heavy or doesn't stay open, the struts are highly suspect.
• 4. Visual Inspection of Struts and Wiring: Examine the power struts for leaks or damage. Follow the wiring harness from the tailgate into the body, particularly around the hinges, looking for pinched, frayed, or broken wires. For more general BMW issues, you can browse our BMW vehicle hub.
• 5. Scan for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner to check for codes from the Body Control Module (BCM) or specific tailgate control modules. These codes can provide valuable insights into electrical faults.
• 6. Consider Strut Replacement: If the struts show signs of failure (leaks, inability to hold position, motor noise without movement), replacing them is often the most effective fix. This typically involves disconnecting the battery, carefully unbolting the old struts, and installing new ones. It is often a two-person job to safely support the tailgate.
• 7. Recalibration: After replacing struts or if a control module was reset, the tailgate system may require recalibration using a diagnostic tool to teach the module the new open/close limits. Refer to specific repair guides for your vehicle, available at All repair guides.

Repair options and cost factors

Repairing your 2018 BMW X5 power tailgate can range from a DIY project to a professional service, with varying cost implications:

• DIY Power Tailgate Strut Replacement: If you're comfortable with basic hand tools, replacing the power struts yourself can save on labor costs. Parts typically range from $200–$600 per strut, depending on whether you choose OEM or quality aftermarket parts. You'll need to purchase two struts.
• Professional Strut Replacement: A professional shop will charge for both parts and labor. The total cost can range from $500–$1,000, as labor involves careful removal and installation, often with specialized tools for recalibration.
• Wiring Harness Repair: If the issue is a damaged wiring harness, repair costs can vary significantly based on the extent of the damage. Simple wire repairs might be $100–$300, while a full harness replacement could be $500–$800 or more.
• Tailgate Control Module (TCM) Replacement: This is usually the most expensive repair. The module itself can cost $400–$800 or more, plus significant labor for diagnosis, replacement, and programming. This repair can push total costs well over $1,000.

Always consider the long-term value of using quality parts, especially for a critical component like the power tailgate on your BMW X5.

When to see a professional

While some aspects of diagnosing and fixing a non-working power tailgate can be tackled by a DIY enthusiast, there are clear instances when professional help is advisable:

• Persistent Electrical Issues: If basic fuse checks don't resolve the problem and you suspect complex wiring or module failures, a professional technician with specialized diagnostic equipment is best equipped to troubleshoot.
• Safety Concerns: If the tailgate falls unexpectedly or is completely unresponsive, posing a safety risk, do not attempt to force it or drive with it unsecured. Seek professional assistance immediately.
• Programming and Recalibration: After replacing certain components, particularly the control module, specific programming and recalibration steps are often required that only a dealership or specialized independent BMW shop can perform.
• Lack of Specialized Tools: If the repair requires tools you don't possess, or if you're uncomfortable working with complex vehicle systems, a professional can ensure the job is done correctly and safely.

Frequently asked questions

Why do BMW X5 power tailgate struts fail?

BMW X5 power tailgate struts typically fail due to normal wear and tear over time. The internal gas pressure that assists in lifting the tailgate can diminish, and the electric motor or gears within the strut can wear out from repeated use. Environmental factors like extreme temperatures and moisture can also accelerate component degradation.

Can I replace the power tailgate struts myself on a 2018 BMW X5?

Yes, replacing the power tailgate struts on a 2018 BMW X5 is a feasible DIY project for someone with moderate mechanical skills and the right tools. However, it often requires a second person to safely support the heavy tailgate during the process, and proper recalibration with a diagnostic tool might be necessary afterward for optimal function.

Does a failed power tailgate strut affect other systems?

Generally, a failed power tailgate strut primarily affects the operation of the tailgate itself. While it won't typically impact major driving systems, a malfunctioning tailgate might trigger warning lights on the dashboard or iDrive screen. In rare cases, severe electrical shorts within a strut's wiring could potentially affect related modules, but this is less common than simple mechanical failure.

Sources and further reading

• All repair guides
• Browse vehicles
• Browse OBD-II codes
• BMW vehicle hub
• X5 model hub

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

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