A new light on your dashboard? You don’t understand why it doesn’t switch off… It’s normal, an automobile is complicated and there are various reasons why a light could come on. If your glow plug light comes on while driving your Mercedes Benz C Class, it may suggest some problems. In this post, we will do everything we can to support you see things more clearly. First, we will discover how the preheating light on your Mercedes Benz C Class operates, and then the different causes it lights up when you are driving

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

The main purpose of the engine glow plug light, which is in most cases represented by a yellow coil, is to make sure that your glow plugs are working properly. Indeed, it must light up when you switch on your Mercedes Benz 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 supposed to stay or come on while driving with your automobile. But, if it comes on while driving, it may suggest 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 Benz C Class?

A glow light that comes on while driving on your Mercedes Benz C Class or at any other time other than when the engine is started is meant to alert you to a problem other than your spark plugs, we will look at this right now. In any case, connecting your vehicle to the diagnostic tool will allow you to carefully interpret the explanation for the light up of your glow light.

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

The first situation is that you detect that your glow plug light comes on while driving your Mercedes Benz C Class and that you also experience a loss of power. In such a case, some concerns can describe its lightning. Here is a list of the main reasons:

  • Issue of EGR valve, in reality, 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 Benz C Class because it is one of the problem of which it is designed to warn you. Have the status of your valve looked at
  • Issue related 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 performance of the turbo.
  • Issue associated 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 disrupt its proper performing.
  • Finally, the last issue that could lead to a glow indicator light on your Mercedes Benz 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 Benz C Class

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

  • 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 issue.
  • You have a false contact somewhere in your electrical circuit, check the other options first because it is not easy to find it alone, we suggest you to go to your mechanic.
  • Faulty injection pressure sensor, ECU error

    • In the event that you have any further questions about the Mercedes Benz C Class, do not hesitate to consult our Mercedes Benz C Class category.