A new light on your dashboard? You don’t understand why it doesn’t shut off… It’s normal, an automobile is elaborate and there are various motives why a light may occur. If it turns out your glow plug light comes on while driving your Mercedes Classe C, it might suggest different issues. On this page, we will do everything we can to support you see things more clearly. First, we will find out how the preheating light on your Mercedes Classe C functions, and then the different motives it lights up when you are driving

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What is the purpose of my Mercedes Classe C 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. In fact, it must light up when you switch on your Mercedes Classe C 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 meant to stay or come on while driving with your motor vehicle. However, if it turns on while driving, it may reveal different troubles, we will try to point out the most important ones.

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

A glow light that comes on while driving on your Mercedes Classe C or at any other time other than when the engine is started is intended to warn you to a problem other than your spark plugs, we will take a look at this right now. Whatever the case, a switch to the diagnostic tool will allow you to carefully translate the motive for the light up of your glow light.

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

The first probability is that you detect that your glow plug light comes on while driving your Mercedes Classe C and that you also experience a loss of power. In this instance, different trouble can explain its lightning. Here is a list of the most important motives:

  • Trouble of EGR valve, indeed, if you are affected a loss of power, it is possible that your EGR valve is blocked, in this instance, it is expected that your preheat light comes on while driving on Mercedes Classe C because it is one of the problem of which it is designed to notify you. Have the status of your valve checked out
  • Issue linked to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can bring about turbo boost and a perturbation in the operation 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 disturb its proper performance.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes Classe C coupled with a loss of power, is that your fuel filter is too dirty, you should 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 C

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

  • 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 the other alternatives first because it is not easy to find it alone, we recommend you to go to your mechanic.
  • Faulty injection pressure sensor, ECU error
  • To discover more tips on the Mercedes Classe C, take a look at the Mercedes Classe C category.