A new warning light on your dashboard? You don’t understand why it doesn’t shut off… It’s normal, a vehicle is complex and there are many motives why a light could occur. If it turns out your glow plug light comes on while driving your Alfa Romeo Giulietta, it might signify some issues. In this post, we will do anything we can to help you see things more clearly. First, we will see how the preheating light on your Alfa Romeo Giulietta works, and then the different reasons it lights up when you are driving


What is the role of my Alfa Romeo Giulietta glow plug light?

The primary role of the engine glow plug light, which is in most cases symbolized by a yellow coil, is to ensure that your glow plugs are working properly. Indeed, it must light up when you switch on your Alfa Romeo Giulietta 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 supposed to stay or come on while driving with your motor vehicle. Nevertheless, if it turns on while driving, it may reveal several issues, we will try to explain the main ones.

What to do if the glow plug light comes on while driving on my Alfa Romeo Giulietta?

A glow light that comes on while driving on your Alfa Romeo Giulietta or at any other time other than when the engine is started is meant to warn you to a problem other than your spark plugs, we will look at this now. Whatever the case, a switch to the diagnostic tool will allow you to carefully translate the explanation for the light up of your glow light.

My Alfa Romeo Giulietta glow light comes on and I’m having a loss of power

The first probability is that you perceive that your glow plug light comes on while driving your Alfa Romeo Giulietta and that you also encounter a loss of power. In such a case, some trouble can explain its presence. Here is a list of the main motives:

  • Problem of EGR valve, in reality, if you go through 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 Alfa Romeo Giulietta because it is one of the failures of which it is intended to notify you. Have the status of your valve checked
  • Trouble associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can result in turbo boost and a disturbance in the operation of the turbo.
  • Trouble related to the injection, either an injector that has seized up or the injection pump that is destroyed 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 Alfa Romeo Giulietta 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 Alfa Romeo Giulietta

To conclude, we’ll give you the reasons for a glow plug light that comes on on your Alfa Romeo Giulietta without you feeling any difference in power or motor vehicle behaviour. Ordinarily, this is an electronic problem:

  • 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 resolve 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 recommend you to go to your technician.
  • Faulty injection pressure sensor, ECU error
  • If you want more guides on the Alfa Romeo Giulietta, go to our Alfa Romeo Giulietta category.