A new warning light on your dashboard? You don’t find out why it doesn’t shut off… It’s normal, an automobile is complicated and there are multiple factors why a light might come on. If your glow plug light comes on while driving your Mercedes Classe C 2, it may possibly reveal several things. 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 Classe C 2 functions, and then the different reasons it lights up when you are driving


What is the purpose of my Mercedes Classe C 2 glow plug light?

The main purpose of the engine glow plug light, which is most of the time 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 Classe C 2 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 vehicle. But, if it turns on while driving, it may reveal different issues, we will try to point out the main ones.

What to do if the glow plug light comes on while driving on my Mercedes Classe C 2?

A glow light that comes on while driving on your Mercedes Classe C 2 or at any other time other than when the engine is started is designed to warn you to a fault other than your spark plugs, we will look at this now. No matter the reason, plug in your car to the diagnostic tool will allow you to properly translate the reason for the light up of your glow light.

My Mercedes Classe C 2 glow light comes on and I’m having a loss of power

The first probability is that you identify that your glow plug light comes on while driving your Mercedes Classe C 2 and that you also experience a loss of power. In this instance, several problems can demonstrate its lightning. Here is a list of the main factors:

  • Issue of EGR valve, in fact, if you suffer 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 Classe C 2 because it is one of the problem of which it is supposed to alert you. Have the status of your valve examined
  • Issue linked to the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can result in turbo boost and a perturbation in the operation 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 disturb its proper performance.
  • Finally, the last issue that could lead to a glow indicator light on your Mercedes Classe C 2 coupled with a loss of power, is that your fuel filter is too dirty, you should encounter 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 2

To conclude, we’ll give you the reasons for a glow plug light that comes on on your Mercedes Classe C 2 without you feeling any difference in power or vehicle behaviour. Ordinarily, this is an electronic fault:

  • Glow plug relays or fuses to be replaced, 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 get rid of the issue.
  • You have a false contact somewhere in your electrical circuit, check the other solutions first because it is not easy to find it alone, we advise you to go to your mechanic.
  • Faulty injection pressure sensor, ECU error
  • If you wish more guides on the Mercedes Classe C 2, go to our Mercedes Classe C 2 category.