A new warning light on your dashboard? You don’t understand why it doesn’t shut off… It’s normal, an automobile is elaborate and there are many reasons why a light might occur. In cases where your glow plug light comes on while driving your Mercedes Classe M, it may possibly signify several concerns. In this article, we will do anything we can to support you see things more clearly. First, we will find out how the preheating light on your Mercedes Classe M functions, and then the different causes it lights up when you are driving


What is the role of my Mercedes Classe M glow plug light?

The primary goal of the engine glow plug light, which is most of the time symbolized by a yellow coil, is to ensure that your glow plugs are working correctly. In reality, it must light up when you switch on your Mercedes Classe M 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 meant to stay or come on while driving with your automobile. But, if it turns on while driving, it may reveal several failures, we will try to point out the main ones.

What to do if the glow plug light comes on while driving on my Mercedes Classe M?

A glow light that comes on while driving on your Mercedes Classe M or at any other time other than when the engine is started is designed to alert you to a problem other than your spark plugs, we will take a look at this right now. No matter the reason, connecting your vehicle to the diagnostic tool will allow you to properly interpret the motive for the light up of your glow light.

My Mercedes Classe M glow light comes on and I’m experiencing a loss of power

The first possibility is that you notice that your glow plug light comes on while driving your Mercedes Classe M and that you also knowledge a loss of power. In this case, several trouble can demonstrate its lightning. Here is a list of the main reasons:

  • Issue of EGR valve, in fact, if you go through a loss of power, it is possible that your EGR valve is clogged, in such a case, it is expected that your preheat light comes on while driving on Mercedes Classe M because it is one of the failures of which it is intended to notify you. Have the status of your valve tested
  • Trouble linked to 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 perturbation in the operation of the turbo.
  • Trouble associated with 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 function.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes Classe M coupled with a loss of power, is that your fuel filter is too dirty, you should get 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 Classe M

Finally, we’ll give you the causes for a glow plug light that comes on on your Mercedes Classe M without you feeling any difference in power or automobile behaviour. In most cases, this is an electronic problem:

  • Glow plug relays or fuses to be replaced, test and change 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 solve the problem.
  • You have a false contact somewhere in your electrical circuit, check the other solutions first because it is not easy to find it alone, we encourage you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error
  • If you want more guides on the Mercedes Classe M, go to our Mercedes Classe M category.