A new light on your dashboard? You don’t understand why it doesn’t shut off… It’s normal, an auto is complex and there are multiple causes why a light could come on. If it turns out your glow plug light comes on while driving your Mercedes Benz GLS Class, it might signify different issues. On this page, we will do anything we can to support you see things more clearly. First, we will see how the preheating light on your Mercedes Benz GLS Class functions, and then the different causes it lights up when you are driving

glow-plug-light-mercedes-benz-gls-class

What is the goal of my Mercedes Benz GLS Class glow plug light?

The primary goal of the engine glow plug light, which is in most cases represented by a yellow coil, is to assure that your glow plugs are working correctly. In fact, it must light up when you switch on your Mercedes Benz GLS Class to tell you that they are heating the intake air in your cylinders and must go out after a few moments when the engine is running. This preheat light is therefore not expected to stay or come on while driving with your automobile. But, if it turns on while driving, it may indicate several issues, we will try to describe the main ones.

What to do if the glow plug light comes on while driving on my Mercedes Benz GLS Class?

A glow light that comes on while driving on your Mercedes Benz GLS Class or at any other time other than when the engine is started is meant to notify you to a fault other than your spark plugs, we will check out this right now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to accurately translate the reason for the light up of your glow light.

My Mercedes Benz GLS Class glow light comes on and I’m going through a loss of power

The first probability is that you notice that your glow plug light comes on while driving your Mercedes Benz GLS Class and that you also knowledge a loss of power. In this case, different problems can describe its lightning. Here is a list of the main causes:

  • Problem of EGR valve, in fact, if you undergo a loss of power, it is possible that your EGR valve is blocked, in this instance, it is obvious that your preheat light comes on while driving on Mercedes Benz GLS Class because it is one of the failures of which it is meant to notify you. Have the status of your valve inspected
  • Trouble associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can result in turbo boost and a disturbance in the performance of the turbo.
  • Trouble relevant to the injection, either an injector that has seized up or the injection pump that is destroyed by filings or other possible foreign bodies that disturb its proper operation.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes Benz GLS Class coupled with a loss of power, is that your fuel filter is too dirty, you should come to feel jerks because of a bad fuel flow in the engine.

My glow plug light comes on or is flashing but no difference on the performance of my Mercedes Benz GLS Class

Finally, we’ll give you the causes for a glow plug light that comes on on your Mercedes Benz GLS Class without you feeling any difference in power or automobile behaviour. In general, this is an electronic fault:

  • Glow plug relays or fuses to be changed, test and replace if necessary.
  • A contactor/potentiometer on one of your pedals (brake, accelerator or clutch) has failed, often a simple de-seizure will be enough to fix the problem.
  • You have a false contact somewhere in your electrical circuit, test out the other solutions first because it is not easy to find it alone, we recommend you to go to your technician.
  • Faulty injection pressure sensor, ECU error

    • If you want more tutorials on the Mercedes Benz GLS Class, go to our Mercedes Benz GLS Class category.