Master Warning Light
A general 'attention' triangle — it accompanies another message on the dashboard display telling you what is wrong.
What it means
Common on Toyota, Lexus, Honda, Hyundai, Kia, Nissan, VW and others, this triangle does not point to one system. It lights alongside a text message in the instrument display — anything from low washer fluid to a hybrid-system fault. Red usually means a more serious condition than amber.
Can you keep driving?
It depends entirely on the accompanying message — read the driver information display. Tire pressure, washer fluid, or key-battery messages are minor; hybrid system, brake, or overheating messages are not.
What to do now
- 1
Check the instrument display for the specific message that accompanies the triangle.
- 2
Look up that message in your owner's manual for urgency.
- 3
If no message shows, cycle the display menus — the alert is usually logged there.
Likely causes
- • Any condition that generates a dashboard message
- • Common triggers: low tire pressure, low fluids, open doors, burnt bulbs, key fob battery, hybrid/EV system faults
Typical fix cost
Varies — from $0 (close a door) to the cost of the underlying fault
Ranges reflect mainstream US parts-and-labor pricing; your vehicle and region will vary.