Key fob battery / key not detected warning light: meaning and what to do

What it means

The key fob battery is weak or the car can't detect the key.

Can I keep driving?

Yes. The key fob battery / key not detected light is information, not a fault. It tells you a system is on or needs a simple action.

What to do

Replace the coin battery in the fob. To start now, hold the fob against the start button.

On some cars it shows as text

KEY

Typical repair cost (US)

$5–$30

Estimated range when a repair is needed; it depends on the car and the cause.

What the color tells you

Amber or yellow lights mean a system needs attention. It's usually safe to keep driving carefully, but don't put it off.