Your custom Tesla lock sound worked perfectly. Then a software update rolled in overnight and the default chime is back. You re-select your sound, it works for a few weeks, and the next update wipes it again. This is the single most common frustration Tesla owners report with custom lock sounds.
Here's why it happens and how to make your LockChime.wav survive every update.
Why Tesla Updates Reset Your Lock Sound
Owners report the selection resetting after some software updates. Tesla hasn't documented why, and we haven't found a release note that explains it, so the causes below are possibilities, not confirmed:
- The selection is cleared: the setting that points to your custom sound goes back to the default
- The USB isn't re-detected on the first boot after the update, so the car plays the stock chime
- The USB is in the wrong port: use a port that carries data
The sound file itself is fine. It's still on your USB; the car just loses the selection.
Looking for a new lock sound?
Browse 2,360+ Tesla-ready sounds, free to preview and download.
Fix 1: Re-Select After Every Update (Quick Fix)
The fastest recovery after an update wipes your sound:
- Confirm your USB is still plugged in to a USB port that carries data (the glovebox port on newer cars)
- Go to Toybox → Boombox → Lock Sound
- Navigate to your USB and re-select
LockChime.wav - Lock your car from the app to verify
This takes 30 seconds but you'll need to do it after every update. For a more permanent solution, keep reading.
Fix 2: Name Your File Exactly Right
Some resets happen because the car finds the file but doesn't auto-select it. Ensuring your file meets Tesla's exact expectations helps the system re-link automatically:
- Filename: exactly
LockChime.wav(capital L, capital C; case-sensitive) - Location:
/Boombox/LockChime.wavat the root of the USB drive - Format: WAV, 44.1kHz, 16-bit PCM
- Size: under 1MB (shorter files re-link more reliably)
If your file was named lockchime.wav or LockChime (1).wav, the car may have been finding it through fuzzy matching that breaks after updates. The exact name is your best insurance. Full file format specs →
Fix 3: Use the Right USB Format and Port
After an update, the car re-enumerates USB devices. If your drive is borderline compatible, this is where it drops:
- Format: FAT32 for drives ≤32GB, exFAT for larger drives. NTFS never works. USB format guide →
- Port: Use a USB port that carries data (the glovebox port on newer cars)
- Drive size: 32GB or 64GB drives are most reliable. Some 256GB+ drives have detection issues
- No hub: Plug the drive directly, not through a USB hub or adapter
After an update, try removing and reinserting the USB drive, then wait 30 seconds before checking Boombox settings.
Fix 4: Soft Reboot After Every Update
A soft reboot after an update forces the car to cleanly re-detect all USB devices:
- Shift into Park
- Hold both scroll buttons on the steering wheel until the touchscreen turns black
- The Tesla logo appears after a few seconds; the restart takes about 30 seconds (Tesla's owner's manual)
- Once the screen is back, check if your custom sound auto-loaded
A reboot is a common thing to try when the car doesn't re-detect the USB drive. We have no source for how long it lasts, so re-check the selection after each update.
Fix 5: Keep a Backup USB Ready
The most reliable long-term strategy: keep a second, identical USB drive with the same /Boombox/LockChime.wav file. After an update:
- Remove the current USB
- Insert the backup USB
- Re-select the sound
- Swap back to the original if preferred
This bypasses any USB caching issues the car might have with the original drive after an update.
Which Updates Reset Sounds?
Tesla does not publish which updates reset the Boombox selection, and we have no data on it. After any update, open Toybox → Boombox → Lock Sound and confirm USB is still selected.
Models
The steps above are the same on Model 3, Model Y, Model S, Model X and Cybertruck. We have no source for a difference between models in how often the selection resets. Use the USB port that carries data (the glovebox port on newer cars).
FAQ
Why does my Tesla keep reverting to the default lock sound?
Owners report the Boombox sound selection resetting after some updates, and Tesla doesn't say why. Your LockChime.wav file is still on the USB: the car just loses the selection pointing to it. Re-select it in Toybox → Boombox → Lock Sound after each update.
Can I prevent Tesla updates from resetting my lock sound?
Tesla doesn't document a setting that keeps the selection through an update. You can minimize re-setup time: ensure your file is named exactly LockChime.wav in a Boombox folder on a FAT32 USB, and do a soft reboot (hold both scroll wheels) after the update completes. This gives the car the best chance of auto-detecting your sound.
Does this happen on every Tesla software update?
Not necessarily. Tesla's release notes don't say which updates keep or clear the Lock Sound selection, so check it after any update and re-select it if it changed.
Will Tesla ever fix this permanently?
Tesla hasn't acknowledged this as a bug; it's a side effect of their update architecture. The community has been reporting this since 2023 and it persists across firmware versions. The workarounds in this guide are the best current solution.
My sound file disappeared from the USB after an update: is that possible?
No. Tesla updates never modify USB drive contents. If your file seems missing, the car may not be reading the USB properly. Remove the drive, check the file on a computer, reinsert it, and do a soft reboot. Full troubleshooting guide →
---
Browse 2,360+ free Tesla lock sounds: every file downloads as a ready-to-use LockChime.wav. Having trouble with your current sound? See our 7-fix troubleshooting guide or the complete LockChime.wav reference. If your sound went completely silent after the latest firmware, see Tesla Lock Sound Muted After 2026.9.1: How to Fix It.
