- Diesel Engine Preglow
- Glow Plugs
- Glow Plug Control Light
This lamp will come on when the temperature is cold and as soon as it goes out, an attempt can be made to start the car. If the lamp is illuminated with the engine running, this indicates that either there is a fault or malfunction with just the glow plug circuit or, the diesel engine management PCM, (Power Control Module also known as an ECU, Electronic Control Unit) has detected that one of its many sensors has either failed, or is giving a signal that is out of a predetermined range.
Whilst this lamp is on, there may be a loss in power and the vehicle will not perform as well as before. This may be very noticeable if the lamp is flashing (the PCM may default to limp home mode). As a guide, if there is no loss of power, reduce speed and have us examine the system as soon as possible.
If there is a lack of power, then it is recommended that the vehicle is not driven as damage may occur to engine emission components.