A new light on your dashboard? You don’t find out why it doesn’t switch off… It’s normal, an auto is complex and there are multiple reasons why a light might occur. If it turns out your glow plug light comes on while driving your Mercedes Classe Glc, it might show some issues. In the following paragraphs, 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 Glc operates, and then the different causes it lights up when you are driving

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What is the purpose of my Mercedes Classe Glc glow plug light?

The main purpose of the engine glow plug light, which is generally represented by a yellow coil, is to ensure that your glow plugs are working correctly. Indeed, it must light up when you switch on your Mercedes Classe Glc 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 supposed to stay or come on while driving with your motor vehicle. However, if it turns on while driving, it may reveal multiple failures, we will try to detail the main ones.

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

A glow light that comes on while driving on your Mercedes Classe Glc 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, plug in your car to the diagnostic tool will allow you to precisely understand the explanation for the light up of your glow light.

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

The first possibility is that you perceive that your glow plug light comes on while driving your Mercedes Classe Glc and that you also experience a loss of power. In such a case, some concerns can explain its presence. Here is a list of the main reasons:

  • Trouble of EGR valve, in fact, if you undergo a loss of power, it is possible that your EGR valve is clogged, in this instance, it is logical that your preheat light comes on while driving on Mercedes Classe Glc because it is one of the issue of which it is designed to notify you. Have the status of your valve looked at
  • Problem associated with the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can bring about turbo boost and a perturbation in the operation of the turbo.
  • Problem in connection with the injection, either an injector that has seized up or the injection pump that is damaged by filings or other possible foreign bodies that disturb its proper performance.
  • Finally, the last trouble that could lead to a glow indicator light on your Mercedes Classe Glc 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 Classe Glc

Finally, we’ll give you the causes for a glow plug light that comes on on your Mercedes Classe Glc without you feeling any difference in power or motor vehicle behaviour. Ordinarily, 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 solve the trouble.
  • You have a false contact somewhere in your electrical circuit, check the other alternatives first because it is not easy to find it alone, we suggest you to go to your repair shop.
  • Faulty injection pressure sensor, ECU error

    • Whenever you have any further questions about the Mercedes Classe Glc, do not hesitate to consult our Mercedes Classe Glc category.