Electric Power Liftgate Strut: Function, Common Faults, and Troubleshooting Guide

What Is an Electric Power Liftgate Strut?

An electric power liftgate strut is an electromechanical component designed to open and close a vehicle's rear liftgate or tailgate automatically. It is commonly used in SUVs, crossovers, hatchbacks, and other vehicles equipped with a powered liftgate system.

Unlike a conventional gas strut, an electric power liftgate strut incorporates an electric drive mechanism that helps move the liftgate under the control of the vehicle's power liftgate system.

Depending on the vehicle design, the system may include one or two electric struts, a liftgate control module, position sensors, a latch actuator, wiring, and anti-pinch protection components.

What Does an Electric Power Liftgate Strut Do?

The electric power liftgate strut performs several important functions:

• Automatic opening: Provides the force needed to raise the liftgate when the driver activates the system.

• Controlled closing: Helps lower the liftgate through the powered closing cycle.

• Position control: Works with the vehicle's control system to manage liftgate movement and travel limits.

• Liftgate support: Helps support the liftgate during operation, depending on the system design.

• Obstacle protection: Works with the vehicle's safety system to detect or respond to obstructions where this feature is supported.

The exact functions and operating logic vary by vehicle model and liftgate system design.

How Does an Electric Power Liftgate Strut Work?

When the driver presses the liftgate button, uses the key fob, or activates another supported control, the vehicle's liftgate control module receives the command.

The control module checks the relevant system conditions and operates the electric drive mechanism. The strut extends or retracts to move the liftgate along its designed path.

Depending on the application, position feedback may come from sensors integrated into the strut or from other components in the liftgate system. The control module uses this information to coordinate movement and manage the opening or closing cycle.

If the system detects an obstruction, an abnormal load, or a component fault, it may stop, reverse, or disable powered operation, depending on the vehicle's safety logic.

Common Electric Power Liftgate Strut Failure Symptoms

A faulty electric power liftgate strut can cause several operating problems. However, similar symptoms may also result from wiring faults, a weak vehicle battery, a defective latch, or a liftgate control module issue.

1. Liftgate Will Not Open Automatically

The liftgate does not respond when the driver presses the liftgate button or key fob.

Possible causes include:

• A faulty electric liftgate strut or internal drive mechanism

• A damaged electrical connector or wiring harness

• A weak vehicle battery or unstable power supply

• A defective liftgate switch or control module

• A latch or lock mechanism that prevents normal operation

2. Liftgate Opens or Closes Slowly

The liftgate moves more slowly than expected or struggles during part of its travel.

Possible causes include:

• Internal wear or damage in the electric drive mechanism

• Excessive mechanical resistance in the liftgate hinges

• Incorrect alignment or increased liftgate load

• Low voltage or an electrical connection problem

• A fault in the liftgate control system

3. Liftgate Stops Before Reaching the Fully Open Position

The liftgate begins to open but stops before reaching its normal height.

Possible causes include:

• A strut motor or drive mechanism problem

• Incorrect position feedback

• Mechanical interference

• A system fault that triggers protective shutdown

• A liftgate opening-height setting or initialization issue, where applicable

4. Liftgate Reverses or Closes Unexpectedly

The liftgate changes direction or stops during operation.

Possible causes include:

• An obstruction in the liftgate's travel path

• Excessive resistance or misalignment

• A position sensor or feedback fault

• An anti-pinch system response

• A fault in the control module or associated wiring

Before replacing a strut, check for physical obstructions and follow the vehicle manufacturer's diagnostic procedure.

5. Unusual Noise During Operation

Grinding, clicking, or abnormal motor noise may indicate a problem with the electric drive mechanism or related liftgate components.

Possible causes include:

• Internal gear or drive mechanism wear

• Loose mounting hardware

• Excessive resistance at the hinges

• Contact between moving parts and surrounding trim

• A damaged or misaligned liftgate assembly

Noise alone does not confirm that the strut has failed. Inspect the complete liftgate mechanism before making a replacement decision.

How to Troubleshoot an Electric Power Liftgate Strut

Follow a systematic diagnostic process to identify the source of the problem.

Step 1: Check the Vehicle Battery and Power Supply

Confirm that the vehicle battery is adequately charged and that the liftgate system receives the correct electrical supply. Low voltage can prevent the system from operating normally.

Step 2: Inspect the Liftgate Mechanism

Check the hinges, mounting points, liftgate alignment, and surrounding components for damage, excessive resistance, or physical interference.

Keep hands and tools clear of moving parts, and follow the manufacturer's safety procedure when supporting the liftgate.

Step 3: Inspect Electrical Connectors and Wiring

Look for loose connectors, damaged insulation, corrosion, or broken wires near the strut and liftgate harness.

Use the vehicle's wiring diagram and appropriate test equipment to verify the power supply, ground, and control circuits.

Step 4: Read Diagnostic Trouble Codes

Use a compatible diagnostic scan tool to check the liftgate control module and related vehicle systems. Record any relevant fault codes before clearing them.

Diagnostic codes can help narrow down the cause, but the code description alone may not identify the failed component.

Step 5: Check Position Feedback and System Initialization

If the liftgate stops at an incorrect height or reverses unexpectedly, check the position feedback system and any required initialization procedure.

Some vehicles require a specific reset or calibration procedure after component replacement, battery disconnection, or system repair. Follow the service information for the exact vehicle.

Step 6: Test the Electric Strut

If the power supply, wiring, mechanical movement, and control signals are correct, test the strut according to the manufacturer's diagnostic instructions.

Do not apply direct battery voltage to unidentified terminals or disconnect components while the system is operating. Incorrect testing may damage the motor, control electronics, or vehicle wiring.

Step 7: Confirm the Repair

After repair or replacement, verify that the liftgate opens and closes smoothly, reaches its expected travel limits, and responds correctly to supported controls. Confirm that any applicable safety functions operate according to the vehicle manufacturer's procedure.

Electric Power Liftgate Strut vs. Gas Strut

An electric power liftgate strut and a conventional gas strut may look similar, but they serve different purposes.

These components are not interchangeable unless the vehicle manufacturer specifically provides a compatible conversion or replacement design.

How to Choose the Correct Electric Power Liftgate Strut

Selecting the correct replacement requires more than matching the vehicle's make and model.

Consider the following factors:

• OE or reference part number: Compare the original part number with the replacement reference.

• Vehicle application: Verify the model, model year, body style, and relevant trim or equipment configuration.

• Left-hand or right-hand position: Some applications use different part numbers for each side.

• Connector and wiring design: Confirm the electrical connector, pin configuration, and applicable system design.

• Strut configuration: Check the actuator type, mounting points, length, and travel specifications.

• System compatibility: Confirm compatibility with the vehicle's liftgate control system and any required initialization procedure.

A vehicle may use different liftgate struts depending on its production date, options, or equipment configuration. Always verify fitment using reliable application data and part-number references before ordering.

Applications of Electric Power Liftgate Struts

Electric power liftgate struts are used in a range of vehicles equipped with powered rear liftgate systems, including:

• SUVs and crossover vehicles

• Hatchbacks with powered liftgate systems

• Selected passenger vehicles with powered trunk lids

• Vehicles with hands-free or key-fob-operated liftgate functions, where supported

The design, dimensions, electrical connections, and control logic can vary significantly between vehicle platforms. Application-specific verification is essential when selecting a replacement part.

Frequently Asked Questions

What are the signs of a faulty electric power liftgate strut?

Common symptoms include failure to open or close automatically, slow movement, incomplete travel, abnormal noise, or unexpected stopping. These symptoms can also be caused by other liftgate system components, so diagnosis is recommended before replacement.

Can I replace an electric power liftgate strut myself?

Replacement difficulty varies by vehicle. The liftgate may be heavy, and some systems require special support procedures, diagnostic checks, or initialization after installation. Follow the vehicle manufacturer's service instructions or consult a qualified technician.

Should electric power liftgate struts be replaced in pairs?

Not every vehicle requires both struts to be replaced together. The correct approach depends on the manufacturer's service recommendations, the condition of the existing components, and the specific system design. If two struts are installed, verify whether the replacement parts must be matched.

Why does my liftgate open but fail to close?

Possible causes include a faulty strut, latch problem, obstruction, position feedback fault, wiring issue, or control module malfunction. Check diagnostic codes and inspect the complete system before identifying the failed component.

Does an electric power liftgate strut need programming?

Some vehicles require initialization, calibration, or a liftgate relearn procedure after replacement. Others may not. Refer to the service instructions for the specific vehicle and system.

How can I verify electric power liftgate strut compatibility?

Use the original equipment part number, vehicle identification information where appropriate, model year, body style, installation position, connector design, and vehicle-specific application data. Do not rely on visual similarity alone.

Conclusion

An electric power liftgate strut is an important component of a vehicle's powered rear liftgate system. It helps control liftgate movement and works with the vehicle's electrical, mechanical, and safety systems.

When the liftgate malfunctions, checking the battery, wiring, mechanical components, diagnostic codes, and position feedback can help identify the cause. Accurate part-number and vehicle-application verification is essential when selecting a replacement.

For automotive parts manufacturers, distributors, repair professionals, and vehicle owners, clear application data and reliable technical references help reduce incorrect part selection and support more effective liftgate system maintenance.

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