2017-2024 Tesla Model 3 & Model Y Trunk Latch Failure: Diagnosis and Replacement Guide

Vehicle Fitment and Part Number Verification

This guide covers the rear trunk and liftgate latch assembly, OEM part number 1500604-00-B (also listed as 150060400B). This part is shared between specific years of the Tesla Model 3 and Model Y.

• 2017-2023 Tesla Model 3: This part fits Model 3 sedans produced within this date range.
• 2020-2024 Tesla Model Y: This part fits all Model Y SUVs produced to date.

Symptoms of a Failing Trunk Latch

When the trunk latch assembly begins to fail, the symptoms are usually obvious and can prevent you from properly securing your vehicle. Because the part is both mechanical and electrical, you may experience a range of issues.

Most Common Symptoms:

• Trunk or Liftgate Won't Latch Shut: This is the most frequent sign of failure. The lid may close but then bounce back up instead of locking. You might hear a click, but the latch fails to engage the striker to hold the lid shut.
• False 'Trunk Open' Warning on Display: The car's main screen will show a persistent warning that the trunk is open, even when it appears to be fully closed. This is caused by a faulty position sensor inside the latch assembly.
• Clicking, Grinding, or Buzzing Noises: Unusual sounds coming from the latch area during the open or close cycle often point to a stripped internal gear or a failing electric motor inside the actuator.
• Power Cinch Feature Fails: On models with a power soft-close, the trunk may catch on the striker but fail to pull itself down tight. This can leave the trunk slightly ajar and not sealed properly.
• Trunk Fails to Open Electronically: The latch may not respond to commands from the key fob, touchscreen, or mobile app, requiring you to use the manual emergency release.
🎬 Watch: How to open a stuck Model 3 trunk

Known Issues, Recalls, and Service Bulletins

While the latch assembly itself (1500604-00-B) has not been the subject of a specific recall, it's critical for owners to be aware of a closely related issue that can mimic latch failure.

NHTSA Recall 21V-00F: Trunk Wiring Harness (2017-2020 Model 3)

Tesla issued a recall for over 356,000 Model 3 vehicles because the repeated opening and closing of the trunk can cause excessive wear on the wiring harness that runs to the trunk lid. This harness contains the coaxial cable for the rearview camera and, on some vehicles, the wiring for the latch itself. Over time, wires can fray or break completely.

Why this matters: A broken wire in this harness can cut power or signal to the trunk latch, making it seem like the latch has failed when the real problem is the wiring. Before replacing the latch, it is highly recommended to inspect this harness, especially on 2017-2020 Model 3s. 🎬 See this video explaining the Tesla trunk recall A Reddit user with a 2023 Model 3 reported that replacing a broken harness fixed their intermittent trunk closing issue after replacing the latch and power strut did not solve the problem.

Diagnosing the Trunk Latch

If you suspect a faulty trunk latch, here are a few diagnostic steps you can take before replacing parts:

1. Check for Obstructions: Ensure nothing is blocking the latch mechanism or the striker, such as dirt, debris, or items in the trunk.
2. Inspect Wiring Harness: As mentioned above, thoroughly check the trunk wiring harness for damage, especially on Model 3s.
3. Adjust Bump Stops: The trunk lid has adjustable rubber stoppers. If these are set too high, they can prevent the lid from closing far enough to latch properly. Try turning them down slightly.
4. Listen to the Latch: Have someone operate the trunk button while you listen near the latch. A clicking sound with no movement suggests the actuator is receiving power but is mechanically broken. A grinding noise points to stripped internal gears. No sound at all could mean a wiring issue or a completely dead motor.
5. Liftgate Calibration (Model Y): Some closing issues on the Model Y can be resolved by recalibrating the liftgate height. Manually move the liftgate to the desired open height, then press and hold the trunk button on the liftgate until you hear a confirmation chime.
🎬 Watch: How to fix a sticking Model Y liftgate

Buying a Used Trunk Latch Actuator: What to Look For

A used OEM latch from a reputable recycler is an excellent, cost-effective alternative to an expensive new part from the dealer. Since this component is both mechanical and electrical, a careful inspection is key.

• Verify the Part Number: The most critical step is to match the part number. Ensure the used part you are buying is 1500604-00-B.
• Inspect the Electrical Connector: Check the connector pins for any signs of corrosion, moisture, or damage. The pins should be straight and clean.
• Check for Physical Damage: Look for cracks in the plastic housing or any signs that the unit has been dropped or impacted. Ensure the metal latch components are not bent, rusted, or excessively worn.
• Ask About the Donor Vehicle: If possible, find out the mileage of the vehicle the part came from. A latch from a lower-mileage vehicle is generally preferable.
• Warranty and Return Policy: Purchase from a seller that offers a warranty and a clear return policy. This protects you in case the part is dead on arrival. A 1-year warranty is available from some sellers.

Replacement Overview

Replacing the trunk latch is a straightforward job that can be done by a DIYer with basic tools. The process is similar for both the Model 3 and Model Y.

• Difficulty: 2 out of 5
• Estimated Time: Less than 1 hour
• Tools Needed: Plastic trim removal tools, 10mm socket.

Basic Steps:

1. Open the trunk/liftgate.
2. Using a plastic trim removal tool, carefully pry off the large interior trim panel on the trunk lid to expose the latch.
3. Disconnect the electrical harness connector from the old latch assembly.
4. Remove the two or three 10mm bolts securing the latch to the lid.
5. Slide the old latch out. Note that it may have tabs requiring it to be slid up or down to release.
6. Install the new latch, tighten the bolts to the specified torque (8-10 Nm or 5.9-7.4 lb-ft), and reconnect the electrical connector.
7. Test the latch operation multiple times before reinstalling the trim panel.

Cost of Replacement

Frequently Asked Questions (FAQ)