Glow plug light (diesel)

On diesel engines this light shows the glow plugs are pre-heating. If it flashes while driving, the engine computer has detected a fault.

ColourAmber
UrgencyModerate

Can I keep driving? Drivable with care. Diagnose soon: performance, economy or other components can be affected.

What to do

  1. Wait for the light to go out before cranking a cold diesel.
  2. If it flashes while driving, have the codes read.
  3. Hard cold starting often points to a failed glow plug.

Symbols and colours vary between manufacturers. Your owner's manual shows the exact symbols used in your car. In general, red means stop or act now, amber/yellow means check soon, and green/blue lights are information only.

Other warning lights