A new light on your dashboard? You don’t understand why it doesn’t turn off… It’s normal, a vehicle is elaborate and there are multiple causes why a light might come on. In cases where your glow plug light comes on while driving your Citroen C4, it may possibly show different issues. In this article, we will do everything we can to support you see things more clearly. First, we will discover how the preheating light on your Citroen C4 operates, and then the different causes it lights up when you are driving

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What is the role of my Citroen C4 glow plug light?

The primary purpose of the engine glow plug light, which is most of the time represented by a yellow coil, is to make sure that your glow plugs are working effectively. In reality, it must light up when you switch on your Citroen C4 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 motor vehicle. Nevertheless, if it turns on while driving, it may indicate several failures, we will try to explain the main ones.

What to do if the glow plug light comes on while driving on my Citroen C4?

A glow light that comes on while driving on your Citroen C4 or at any other time other than when the engine is started is designed to notify you to a fault other than your spark plugs, we will take a look at this right now. No matter the reason, a switch to the diagnostic tool will allow you to properly translate the reason for the light up of your glow light.

My Citroen C4 glow light comes on and I’m suffering from a loss of power

The first situation is that you notice that your glow plug light comes on while driving your Citroen C4 and that you also experience a loss of power. In this case, different complications can demonstrate its presence. Here is a list of the main causes:

  • Problem of EGR valve, indeed, if you are affected a loss of power, it is possible that your EGR valve is clogged, in this case, it is obvious that your preheat light comes on while driving on Citroen C4 because it is one of the issue of which it is meant to alert you. Have the status of your valve examined
  • Issue related to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can lead to 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 malfunctioned by filings or other possible foreign bodies that disturb its proper function.
  • Finally, the last trouble that could lead to a glow indicator light on your Citroen C4 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 Citroen C4

Finally, we’ll give you the causes for a glow plug light that comes on on your Citroen C4 without you feeling any difference in power or motor vehicle behaviour. Generally, this is an electronic fault:

  • Glow plug relays or fuses to be changed, test and change 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 fix the trouble.
  • You have a false contact somewhere in your electrical circuit, test out 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
  • If you need more guides on the Citroen C4, go to our Citroen C4 category.