how to fix the rear trunk not opening in my Tesla Model 3 Original (2017-2023)

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

498 words

Problem Statement

Learn how to diagnose and fix the rear trunk not opening issue in Tesla Model 3 (2017-2023). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical components to prevent shock or short-circuiting.

Symptoms

•Rear trunk release button is unresponsive
•Key fob does not open the trunk
•Trunk fails to respond to touchscreen commands
•Trunk manually opens but does not latch properly
•Warning message on the dashboard related to trunk operation

Diagnostic Steps

1
Inspect the key fob battery and replace if necessary.
2
Check the trunk release button for physical damage or obstructions.
3
Use the Tesla mobile app to attempt to open the trunk remotely.
4
Inspect the wiring and connectors at the trunk latch for signs of damage or corrosion.
5
Scan the vehicle’s computer system for any error codes related to the trunk operation using a Tesla diagnostic tool.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Multimeter
•Trim removal tool
•Screwdrivers (Phillips and flathead)
•Socket set

Parts Required

•CR2032 key fob battery
•Replacement trunk latch (if defective)

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Diagnostic Steps

1
Inspect the key fob battery and replace if necessary.
2
Check the trunk release button for physical damage or obstructions.
3
Use the Tesla mobile app to attempt to open the trunk remotely.
4
Inspect the wiring and connectors at the trunk latch for signs of damage or corrosion.
5
Scan the vehicle’s computer system for any error codes related to the trunk operation using a Tesla diagnostic tool.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a flat surface and the ignition is off.
Disconnect the 12V battery to avoid electrical shock.

2. Inspect and Test Key Fob

Open the key fob casing with a small screwdriver.
Replace the battery with a new CR2032 battery.
Reassemble the fob and test the trunk release function.

3. Access Trunk Latch Mechanism

Open the rear seats to gain access to the trunk latch area.
Remove the interior trim panels using a trim removal tool to expose the latch assembly.
Disconnect the electrical connector from the trunk latch.

4. Test and Replace Trunk Latch

Using a multimeter, test the latch mechanism for continuity to ensure it is functioning properly.
If faulty, remove the trunk latch by unscrewing the mounting bolts.
Install the new trunk latch in the reverse order and reconnect the electrical connector.

5. Reassemble and Test

Reinstall the interior trim panels securely.
Reconnect the 12V battery.
Test the trunk operation using the key fob, touchscreen, and manual button.