BYD reversing noise: pedestrian warning sound or a fault?

A designed exterior pedestrian warning sound is one possibility. Each of the seven reviewed model handbooks describes a continuous sound while the vehicle is reversing. This is AVAS, intended to alert people nearby because an electric car can otherwise be quiet at low speed. It does not prove that the sound you hear is AVAS. A new harsh, grinding, scraping or clunking noise, or any noise accompanied by changed braking, steering or vehicle behaviour, needs a different response. Use the safety notice above and the exact-model source below; do not keep driving solely because this page mentions a normal warning sound.

No. A continuous designed warning sound, an obstacle warning and a mechanical noise are not interchangeable descriptions. This page cannot identify a noise remotely or certify that brakes, tyres, steering or the drive system are sound. If a noise is new, changed or unexplained, arrange assessment rather than trying to match it to another owner’s recording. If vehicle control is affected, stop safely and request assistance. A warning light or the absence of one is not a diagnosis.

The reviewed handbooks direct owners to a BYD authorised dealer or service provider if the expected AVAS sound is confirmed absent. Their check instructions are not identical: some describe checking in Drive and others in Reverse. Do not copy a shared driving test from a forum or another model. Read your exact handbook and ask the provider how to assess it safely if you are unsure. Do not stand in the path of the car, have a helper stand behind it or use a missing sound as permission to disable the system.

Do not disable or modify AVAS as a way to diagnose an unexplained noise. It is there to alert pedestrians. The reviewed handbooks that describe a pause control warn that pedestrian alerting must remain available when people may be around; control availability also varies by model and region. A switch or menu described for another BYD is not proof that your car has it. This guide deliberately gives no shared off-switch, fuse-removal, coding or speaker-disconnection instructions.

No. The reviewed handbooks share the explanation of a pedestrian warning sound while reversing, but their menus, optional controls and missing-sound checks differ. Some printed speed conversions also differ, so no universal threshold is prescribed here. Use the source labelled for your exact model and match the handbook edition and equipment. Do not carry an original ATTO 3 setting into EVO, a DOLPHIN setting into SURF, or an earlier SEAL control into a later edition without confirmation.

Describe the noise in your own words and say whether it is steady, intermittent or newly changed. Record whether it was noticed only in Reverse, also in Drive, during braking or while steering, and whether there were warning messages or changes in vehicle behaviour. Include the model, handbook edition and relevant recent servicing or tyre work. Do not drive to collect a recording or handle a phone at the wheel. Share registration, VIN and contact details privately with official support when needed, not in public screenshots. These observations help assessment; they are not a self-diagnosis.