2013 Subaru Impreza Trunk Won't Open: Causes & Fixes

Understanding Your 2013 Subaru Impreza Trunk Release Problems

If your 2013 Subaru Impreza trunk won't open when you press the key fob button or interior release switch, you're dealing with a trunk release system failure. This electrical issue affects the motorized trunk release mechanism that allows you to open the trunk without using the key. While frustrating, this problem is relatively common in the 2013 Impreza model year and typically requires moderate repair skills to fix.

The trunk release system in your Impreza consists of several components working together: the trunk release actuator motor, wiring harness, interior and key fob switches, and the body control module. When any of these components fail, you'll lose the convenient electric trunk opening feature, though you can still access your trunk manually using the key.

Symptoms of Trunk Release System Failure

Recognizing the signs of trunk release problems helps you identify the issue early and prevent complete system failure. Here are the most common symptoms you'll experience:

• No response to key fob trunk button: The trunk doesn't open when you press the trunk release button on your key fob, even though other key fob functions work normally
• Interior trunk release switch not working: The trunk release button inside your Impreza doesn't activate the trunk opening mechanism
• No motor sounds: You don't hear the typical whirring or clicking sound that normally occurs when the trunk release actuator engages
• Partial trunk movement: The trunk may start to open but stops partway, indicating a weak or failing actuator motor
• Intermittent operation: The trunk release works sometimes but fails at other times, suggesting electrical connection problems
• Manual key still works: You can still open the trunk using the physical key, confirming the issue is with the electrical release system

Common Causes of Trunk Release Failure

Trunk Release Actuator Motor Failure (Most Likely)

The trunk release actuator motor is the most common failure point in 2013 Subaru Impreza models. This small electric motor pulls the trunk latch mechanism to release the trunk when activated. Over time, the motor's internal components wear out, brushes deteriorate, or the motor housing cracks. When the actuator fails, you won't hear any motor noise when pressing the release button, and the trunk won't respond to electrical commands.

Trunk Release Wiring Harness Issues

The wiring harness that connects the trunk release system can develop problems due to repeated flexing as the trunk opens and closes. Common wiring issues include broken wires near the trunk hinge area, corroded connections at the actuator motor, or damaged insulation causing short circuits. These problems prevent electrical power from reaching the actuator motor, resulting in complete system failure.

Trunk Release Switch Failure

Your Impreza has multiple trunk release switches: one on the key fob and typically one inside the vehicle. If the interior switch fails while the key fob button continues working (or vice versa), you've identified a switch-specific problem. Switch failure often occurs due to worn contacts, moisture infiltration, or mechanical wear from repeated use.

Body Control Module Programming Issues

Less commonly, the body control module (BCM) that manages various electrical systems may develop programming errors or software glitches. This can disable the trunk release function while leaving other key fob operations intact. BCM issues typically require professional diagnostic equipment to identify and resolve.

Diagnosing the Specific Cause

Proper diagnosis helps you identify the exact component causing your trunk release problems, saving time and money on repairs.

Step 1: Test All Release Methods

First, test both the key fob trunk button and any interior trunk release switches. If neither works, the problem likely lies with the actuator motor or wiring. If one method works but not the other, focus on the non-functioning switch or its associated wiring.

Step 2: Listen for Motor Sounds

Have someone press the trunk release button while you listen near the trunk latch area. No sound usually indicates actuator motor failure or complete power loss. Clicking without trunk movement suggests a mechanical problem with the latch mechanism.

Step 3: Check Electrical Connections

Inspect the wiring connections at the trunk release actuator, located behind the trunk latch mechanism. Look for loose connections, corrosion, or damaged wires. Pay special attention to the area where wires pass through the trunk hinge, as this is a common failure point.

Step 4: Test with Multimeter

Using a multimeter, check for 12-volt power at the actuator motor connector when the trunk release button is pressed. No power indicates wiring or switch problems, while power present with no motor operation confirms actuator failure.

Repair Options and Solutions

Professional Repair

Taking your Impreza to a qualified technician ensures proper diagnosis and repair. Professionals have access to Subaru-specific diagnostic tools and genuine replacement parts. They can also update body control module programming if needed. Professional repair typically takes 1-2 hours and includes warranty coverage on parts and labor.

DIY Repair Approach

With moderate mechanical skills, you can replace the trunk release actuator motor yourself. The process involves removing trunk interior panels to access the latch mechanism, disconnecting the old actuator, and installing a replacement. You'll need basic hand tools and approximately 2-3 hours for completion.

For wiring repairs, you'll need electrical skills to safely splice damaged wires or replace corroded connectors. Always disconnect the battery before working on electrical components to prevent short circuits or airbag deployment.

Cost Breakdown for Repairs

Professional Repair Costs

• Trunk release actuator replacement: $200-300 (including labor)
• Wiring harness repair: $150-250 (depending on extent of damage)
• Switch replacement: $100-180 (parts and labor)
• Diagnostic fee: $100-150 (often applied toward repair cost)

DIY Repair Costs

• Trunk release actuator (aftermarket): $50-80
• Trunk release actuator (OEM): $90-120
• Wiring repair materials: $20-40
• Interior switch: $30-60

Prevention Tips

Regular maintenance helps prevent trunk release system failures and extends component life:

• Lubricate trunk latch mechanism: Apply white lithium grease to moving parts every 6 months
• Keep connections clean: Periodically inspect and clean electrical connections to prevent corrosion
• Avoid excessive force: Don't pull on the trunk lid if the release doesn't work immediately
• Address issues early: Fix intermittent problems before they become complete failures
• Protect from moisture: Ensure trunk weatherstripping remains intact to prevent water damage
• Use manual release occasionally: Periodically open the trunk with the key to maintain mechanical components

Safety Considerations

When working on trunk release systems, prioritize safety to prevent injury and vehicle damage. Always support the trunk lid properly when working inside the trunk area to prevent it from closing unexpectedly. Be careful not to damage weatherstripping during panel removal, as this can lead to water leaks. If testing the system while inside the trunk, ensure someone remains outside the vehicle to assist if the trunk closes.