A new warning light on your dashboard? You don’t find out why it doesn’t shut off… It’s normal, a car is elaborate and there are many motives why a light might occur. In the event that your glow plug light comes on while driving your Mercedes Benz M Class, it may possibly suggest several things. In this post, 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 Benz M Class works, and then the different reasons it lights up when you are driving

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

The main role of the engine glow plug light, which is in most cases symbolized by a yellow coil, is to make sure that your glow plugs are working correctly. Indeed, it must light up when you switch on your Mercedes Benz M Class to tell you that they are heating the intake air in your cylinders and must go out after a few minutes when the engine is running. This preheat light is therefore not expected to stay or come on while driving with your vehicle. But, if it comes on while driving, it may reveal multiple troubles, we will try to describe the main ones.

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

A glow light that comes on while driving on your Mercedes Benz M Class or at any other time other than when the engine is started is designed to notify you to a problem other than your spark plugs, we will check out this right now. Whatever the case, plug in your car to the diagnostic tool will allow you to carefully understand the explanation for the light up of your glow light.

My Mercedes Benz M Class glow light comes on and I’m encountering a loss of power

The first possibility is that you perceive that your glow plug light comes on while driving your Mercedes Benz M Class and that you also knowledge a loss of power. In this instance, several trouble can explain its presence. Here is a list of the main motives:

  • Issue of EGR valve, indeed, if you go through a loss of power, it is possible that your EGR valve is clogged, in such a case, it is logical that your preheat light comes on while driving on Mercedes Benz M Class because it is one of the problem of which it is meant to notify you. Have the status of your valve examined
  • Issue associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can cause turbo boost and a perturbation in the performance of the turbo.
  • Issue related to the injection, either an injector that has seized up or the injection pump that is malfunctioned by filings or other possible foreign bodies that disturb its proper performing.
  • Finally, the last trouble that could lead to a glow indicator light on your Mercedes Benz M Class 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 Benz M Class

To conclude, we’ll give you the reasons for a glow plug light that comes on on your Mercedes Benz M Class without you feeling any difference in power or vehicle behaviour. In general, this is an electronic problem:

  • Glow plug relays or fuses to be swapped out, 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 get rid of the trouble.
  • You have a false contact somewhere in your electrical circuit, test the other options first because it is not easy to find it alone, we advise you to go to your repair shop.
  • Faulty injection pressure sensor, ECU error
  • If you wish more guides on the Mercedes Benz M Class, go to our Mercedes Benz M Class category.