A new light on your dashboard? You don’t understand why it doesn’t switch off… It’s normal, a vehicle is complicated and there are various causes why a light might occur. If your glow plug light comes on while driving your Renault Grand Modus, it may indicate some problems. In this article, we will do anything we can to support you see things more clearly. First, we will see how the preheating light on your Renault Grand Modus operates, and then the different causes it lights up when you are driving

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What is the purpose of my Renault Grand Modus glow plug light?

The primary role 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 effectively. Indeed, it must light up when you switch on your Renault Grand Modus 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 expected to stay or come on while driving with your car. But, if it turns on while driving, it may show multiple troubles, we will try to explain the most important ones.

What to do if the glow plug light comes on while driving on my Renault Grand Modus?

A glow light that comes on while driving on your Renault Grand Modus or at any other time other than when the engine is started is intended to inform you to a problem other than your spark plugs, we will look at this right now. In any case, a switch to the diagnostic tool will allow you to accurately understand the explanation for the light up of your glow light.

My Renault Grand Modus glow light comes on and I’m suffering from a loss of power

The first possibility is that you recognize that your glow plug light comes on while driving your Renault Grand Modus and that you also encounter a loss of power. In such a case, some complications can demonstrate its presence. Here is a list of the most important causes:

  • Issue of EGR valve, in reality, if you are affected a loss of power, it is possible that your EGR valve is blocked, in such a case, it is expected that your preheat light comes on while driving on Renault Grand Modus because it is one of the problem of which it is expected to alert you. Have the status of your valve examined
  • Trouble 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 performance of the turbo.
  • Trouble in connection 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 affect its proper operation.
  • Finally, the last trouble that could lead to a glow indicator light on your Renault Grand Modus 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 Renault Grand Modus

To finish , we’ll give you the causes for a glow plug light that comes on on your Renault Grand Modus without you feeling any difference in power or car 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 fix the trouble.
  • 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 recommend you to go to your technician.
  • Faulty injection pressure sensor, ECU error
  • In the event that you have any further questions about the Renault Grand Modus, do not hesitate to consult our Renault Grand Modus category.