OWNER ANSWER
Why does my SEALION 7 make a high-pitched sound when stopped?
If you hear a high-pitched sound while stopped in Drive, note whether it continues after you park normally. BYD describes a pedestrian warning sound while moving slowly and a brief parking-brake motor sound as the brake engages or releases. A recurring tone while the car is stationary needs its own check.
For the SEALION 7 covered by the 07.2024 EN_V0 right-hand-drive handbook.
- When you next hear it during normal use, note whether the car was fully stopped or creeping. Wait until parked to write it down.
- When you park normally, select Park and confirm the parking brake is engaged. Note whether the sound continues, stops, or occurs only briefly as the parking brake engages.
- Note any warning message and whether the heating or air conditioning was running. If the noise repeats, give BYD those details and the conditions in which it first appeared.
What success looks like
You can describe when the sound starts and stops. A brief motor sound as the parking brake applies or releases matches the handbook. A repeatable tone at a standstill is a separate symptom to report.
If that did not work
Ask BYD to reproduce the sound and identify which component is making it. One Australian owner reported that their service centre attributed their noise to the heater and that it became quieter after service. Another reported that they heard it less with Auto Vehicle Hold in use. The reported conditions and software are incomplete, so neither observation identifies the source on your car.
Safety note: If braking changes or a brake warning appears, stop safely and arrange assistance. Keep the car secured while checking the sound.
Useful next steps
BYD SEALION 7 RHD handbook. Parking-brake operating sound, printed p. 115. Checked 13 November 2026.
Open source (BYD UK)BYD SEALION 7 RHD handbook. Acoustic vehicle alerting system, printed p. 163.
Open source (BYD UK)