Diesel Glow Plugs Active

This curlicue is specific to diesel-powered vehicles and indicates the glow plugs are active. The glow plugs are used to warm the air in the cylinder prior to ignition, as the metal internals can absorb the heat of the fuel/air compression cycle and cause a failure to start. (Diesels do not have spark plugs like gasoline vehicles and rely on the heat from compression to facilitate combustion.) Once this light turns off, you can start your vehicle. If it's blinking, there may be a malfunction in the glow-plug system.