A new light on your dashboard? You don’t understand why it doesn’t shut off… It’s typical, a vehicle is complicated and there are many factors why a light might occur. If your glow plug light comes on while driving your Opel Insignia, it may possibly reveal several issues. In this article, we will do everything we can to help you see things more clearly. First, we will discover how the preheating light on your Opel Insignia operates, and then the different explanations it lights up when you are driving

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What is the purpose of my Opel Insignia glow plug light?

The main role of the engine glow plug light, which is generally represented by a yellow coil, is to guarantee that your glow plugs are working effectively. Indeed, it must light up when you switch on your Opel Insignia 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. However, if it turns on while driving, it may indicate different troubles, we will try to explain the most important ones.

What to do if the glow plug light comes on while driving on my Opel Insignia?

A glow light that comes on while driving on your Opel Insignia or at any other time other than when the engine is started is meant to notify you to a fault other than your spark plugs, we will look at this right now. No matter the reason, connecting your vehicle to the diagnostic tool will allow you to precisely interpret the reason for the light up of your glow light.

My Opel Insignia glow light comes on and I’m encountering a loss of power

The first possibility is that you detect that your glow plug light comes on while driving your Opel Insignia and that you also experience a loss of power. In such a case, several problems can describe its presence. Here is a list of the most important factors:

  • Problem of EGR valve, in reality, if you are affected a loss of power, it is possible that your EGR valve is blocked, in this case, it is logical that your preheat light comes on while driving on Opel Insignia because it is one of the failures of which it is expected to alert you. Have the status of your valve looked at
  • Problem linked to 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 performance of the turbo.
  • Problem linked 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 affect its proper operation.
  • Finally, the last problem that could lead to a glow indicator light on your Opel Insignia coupled with a loss of power, is that your fuel filter is too dirty, you should get 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 Opel Insignia

To conclude, we’ll give you the explanations for a glow plug light that comes on on your Opel Insignia without you feeling any difference in power or motor vehicle behaviour. In most cases, this is an electronic fault:

  • Glow plug relays or fuses to be replaced, 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 resolve the problem.
  • 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 advise you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

    • To get more tips on the Opel Insignia, take a look at the Opel Insignia category.