What do the warning lights on a car's dashboard mean?

When starting or switching on a car, a display of lights and symbols appears in front of anyone preparing to set off, and yet, beyond routines and rituals, one must admit it is not something to take lightly. One of the moments most feared by any driver is the illumination of one of the instrument cluster lights on analogue dashboards, or the appearance of a warning on digital, more recent designs, unexpectedly or suddenly.

The appearance of a warning light can be as unsettling as a ghostly apparition on a country road, since, depending on the warning highlighted, we may be facing a call to attention that is more or less serious, but always of interest to whoever is in command of the car and directly related to the condition of the vehicle and road safety.

Thus, it should be noted that, whether before the car is switched on or when the light comes on in the middle of a journey, before understanding the sometimes cryptic message of the fault warning lights on a car’s instrumentation, the colour used to illuminate them will indicate the type of information the vehicle has detected and is communicating to its user in a pictographic manner.

Like a traffic light regulating activity on the tarmac, the colours red, orange or amber and green, blue, white or others with neutral connotations will be used by manufacturers to report on the condition of the car.

What do the colours of the instrument cluster lights mean?

As one would expect, the warmer the colour of the warnings, the greater their significance. In fact, warning lights on a car’s instrument cluster illuminated in red indicate an emergency situation that must be resolved immediately. The seriousness of the matter lies in the information itself, and therefore, for the integrity of the vehicle and its occupants, as well as others, it is advisable to stop the car safely and heed the information highlighted by the onboard system.

Indicators of serious faults or breakdowns include a red light for the cooling system temperature or the engine warning light.

Lighting in orange or amber for the car’s warning lights calls for the special attention of its main user, but without implying an imminent danger.

This happens, for example, when the key is inserted into the ignition before starting, or when it is turned before starting vehicles that incorporate and require a glow-plug preheating system.

As for warnings in green, blue, white or other colours other than those mentioned above, they indicate the default operation or activation of certain systems and do not, in any case, signify a fault or malfunction.

This can range from the intervention of the car’s stability control to the switching on of the vehicle’s lighting system.