A new light on your dashboard? You don’t find out why it doesn’t turn off… It’s typical, a car is complex and there are many factors why a light might come on. In the event that your glow plug light comes on while driving your Renualt Express, it may indicate some issues. On this page, we will do anything we can to help you see things more clearly. First, we will find out how the preheating light on your Renualt Express works, and then the different motives it lights up when you are driving


What is the purpose of my Renualt Express glow plug light?

The main intent of the engine glow plug light, which is in most cases symbolized by a yellow coil, is to guarantee that your glow plugs are working effectively. Indeed, it must light up when you switch on your Renualt Express 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 supposed to stay or come on while driving with your car. However, if it turns on while driving, it may indicate several troubles, we will try to explain the main ones.

What to do if the glow plug light comes on while driving on my Renualt Express?

A glow light that comes on while driving on your Renualt Express 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 look at this now. In any case, connecting your vehicle to the diagnostic tool will allow you to carefully understand the motive for the light up of your glow light.

My Renualt Express glow light comes on and I’m having a loss of power

The first situation is that you identify that your glow plug light comes on while driving your Renualt Express and that you also encounter a loss of power. In this case, some complications can explain its lightning. Here is a list of the main factors:

  • Trouble of EGR valve, indeed, if you undergo a loss of power, it is possible that your EGR valve is clogged, in this instance, it is expected that your preheat light comes on while driving on Renualt Express because it is one of the problem of which it is supposed to warn you. Have the status of your valve tested
  • 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 performance of the turbo.
  • Issue relevant to the injection, either an injector that has seized up or the injection pump that is broken by filings or other possible foreign bodies that affect its proper operation.
  • Finally, the last problem that could lead to a glow indicator light on your Renualt Express coupled with a loss of power, is that your fuel filter is too dirty, you should experience 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 Renualt Express

To conclude, we’ll give you the motives for a glow plug light that comes on on your Renualt Express without you feeling any difference in power or car behaviour. Generally, this is an electronic fault:

  • 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 fix the problem.
  • You have a false contact somewhere in your electrical circuit, test out the other solutions first because it is not easy to find it alone, we suggest you to go to your technician.
  • Faulty injection pressure sensor, ECU error
  • If you want more tutorials on the Renualt Express, go to our Renualt Express category.