If you see a diesel engine pre-glow warning light come on steady at startup, it simply means that your engine is in the process of warming up and you will be able to start your car or truck momentarily.

Is it safe to drive with the glow plug light on?

You can probably drive safely with the Glow Plug Light on as long as you take it easy. But you do need to get it checked out. Always remember, your warning lights are trying to tell you something, and determining whether the message is serious or of little consequence is best left up to a qualified mechanic.

What does glow plug indicator mean?

Glow Plug Indicator

Indicator light means that the engine's glow plugs are warming up and the engine should not be started until the light goes out. If it flashes, an issue has been detected, such as a worn out glow plug.