BYD Seagull Master Warning Light: Not a Fault Code

BYD Seagull master warning light: the yellow triangle is not a fault code

Scope: China-mainland 2026 Seagull; official website file 260317; PDF p. 45, "Master warning indicator"; actual vehicle graphics prevail

The light and the message work together

The manual explains that when the master warning light comes on, you should look at the fault message in the information display. Its job is to prompt you to read the message, not to tell you on its own that a particular part has failed. Sending a parts supplier a single photo of the master warning icon and asking for a controller or sensor leaves out the key evidence needed to decide fitment and what repair is needed. ^[1]

Save the full message first

Once safely stopped, record the full text in the information display, any other indicators showing at the same time, the time it happened and how the car was being used. Giving the workshop the master warning together with the specific message avoids guessing the fault from the light's colour. A record is not a diagnosis, and a system name in the message does not mean the most expensive assembly in that system must be replaced. ^[1]

Act on the specific risk

If it comes with a braking, steering or battery overheating warning, follow the relevant section for this vehicle and, if necessary, stop safely and call for assistance; the colour of the master warning cannot tell you how much further you can drive. This article lists no generic fault codes and gives no code-clearing steps; repair conclusions must be based on checks of the actual vehicle and the manufacturer's procedures. ^[1]

Sources

[Source 1] BYD China official website: 2026 Seagull Owner's Manual (in Chinese) (public PDF on the official website)
https://www.byd.com/material/domestic-official/user-manual/ocean/2026%E6%AC%BE%E6%B5%B7%E9%B8%A5%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C260317.pdf
Verified: 2026-10-03; page publication date not confirmed.

This article contains information-organising suggestions from the editorial team; it is not a manufacturer repair procedure.