A new light on your dashboard? You don’t figure out why it doesn’t switch off… It’s normal, a car is elaborate and there are multiple motives why a light may come on. In the event that your glow plug light comes on while driving your Mercedes C class, it might suggest different concerns. 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 C class works, and then the different causes it lights up when you are driving

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What is the role of my Mercedes C class glow plug light?

The main goal of the engine glow plug light, which is in most cases represented by a yellow coil, is to ensure that your glow plugs are working properly. In reality, it must light up when you switch on your Mercedes C 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 meant to stay or come on while driving with your automobile. Nevertheless, if it comes on while driving, it may reveal different issues, we will try to detail the main ones.

What to do if the glow plug light comes on while driving on my Mercedes C class?

A glow light that comes on while driving on your Mercedes C class or at any other time other than when the engine is started is meant to warn you to a fault other than your spark plugs, we will check out this right now. No matter the reason, a switch to the diagnostic tool will allow you to properly understand the motive for the light up of your glow light.

My Mercedes C class glow light comes on and I’m suffering from a loss of power

The first probability is that you notice that your glow plug light comes on while driving your Mercedes C class and that you also experience a loss of power. In this instance, different complications can describe its presence. Here is a list of the main motives:

  • Trouble of EGR valve, in fact, if you are affected 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 C class because it is one of the problem of which it is intended to alert you. Have the status of your valve tested
  • Issue related to 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 damaged by filings or other possible foreign bodies that disrupt its proper functioning.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes C 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 C class

To finish , we’ll give you the causes for a glow plug light that comes on on your Mercedes C class without you feeling any difference in power or automobile behaviour. Ordinarily, this is an electronic fault:

  • Glow plug relays or fuses to be swapped out, 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 problem.
  • You have a false contact somewhere in your electrical circuit, test out the other alternatives first because it is not easy to find it alone, we recommend you to go to your repair shop.
  • Faulty injection pressure sensor, ECU error

    • If you want more tutorials on the Mercedes C class, go to our Mercedes C class category.