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Why Your Tesla Custom Lock Sound Is Not Working (2026 Checklist)

Mar 1, 2026Tesla Lock Sound Team

Complete troubleshooting guide for Tesla custom lock chimes. Fix LockChime (1).wav errors, wrong USB folders, file size limits, and audio format issues.

Why Your Tesla Custom Lock Sound Is Not Working (2026 Checklist)

With the Tesla Holiday Update (2023.44.30 and newer), owners of Model 3, Model Y, Cybertruck, and Model S/X can finally replace the standard car horn lock sound with custom audio.

However, thousands of Tesla owners plug in their USB drive only to be greeted by complete silence when walking away. If your Tesla custom lock sound isn’t working, work through this definitive 2026 checklist.

1. The "#1" Culprit: File Renamed to LockChime (1).wav

When downloading audio files on Windows, macOS, Chrome, or Safari, your browser will automatically rename duplicates by appending a number.

  • ❌ LockChime (1).wav
  • ❌ LockChime.wav (1)
  • ❌ lockchime.wav.mp3
  • ✅ LockChime.wav (Must be exact)

Tesla's onboard Linux computer searches exclusively for the exact string LockChime.wav. If there is any space, parenthesis, or double extension, the car silently skips it.

Quick Fix: Use our free USB Drive Doctor to automatically scan your drive and repair any renamed files in 1 click.

2. Placed Inside the TeslaCam Folder Instead of Drive Root

Many owners open their USB drive, see the TeslaCam folder created by Dashcam/Sentry Mode, and drag the file inside it.

  • ❌ USB Drive / TeslaCam / LockChime.wav
  • ✅ USB Drive / LockChime.wav (Top-level root directory)

The file must sit directly in the root directory of the USB drive, right next to the TeslaCam folder, not inside it.

3. File Size Exceeds Tesla's 1MB Ceiling

Tesla firmware imposes a strict hardware safety ceiling on custom sound files: 1MB (1,048,576 bytes). If your file is even 1KB over 1,048,576 bytes, the Tesla media player will ignore it without displaying any warning message.

When you use our Audio Studio, the output WAV is automatically mastered and clamped to well under 500KB.

4. Duration Exceeds 5 Seconds

The sound effect must not exceed 5.0 seconds in total length. Any audio longer than 5 seconds will either fail to play or be abruptly truncated by the car firmware. We recommend keeping lock chimes between 1.5 and 3.5 seconds for the punchiest experience.

5. Wrong Audio Encoding (Renaming .mp3 to .wav)

Simply changing a file extension from .mp3 to .wav in Windows Explorer or macOS Finder does not convert the underlying audio codec. Tesla requires Uncompressed Linear PCM (44.1kHz, 16-bit, 1-channel mono).

Use our free browser-native Lock Sound Converter to properly decode and re-encode your audio file.

Summary Installation Checklist

  1. Format your drive (FAT32 or exFAT).
  2. Save LockChime.wav to the root folder.
  3. Plug the drive into the Tesla glovebox USB port.
  4. On the car touchscreen, navigate to: Toybox > Boombox > Lock Sound.
  5. Select "USB".
  6. Step outside with your phone key and test!