A new warning light on your dashboard? You don’t understand why it doesn’t turn off… It’s typical, a car is complicated and there are various motives why a light might come on. If it turns out your glow plug light comes on while driving your Volkswagen Golf 8, it may signal different problems. In the following paragraphs, we will do anything we can to help you see things more clearly. First, we will discover how the preheating light on your Volkswagen Golf 8 operates, and then the different causes it lights up when you are driving

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What is the role of my Volkswagen Golf 8 glow plug light?

The main intent of the engine glow plug light, which is most of the time represented by a yellow coil, is to ensure that your glow plugs are working properly. In reality, it must light up when you switch on your Volkswagen Golf 8 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 vehicle. But, if it comes on while driving, it may indicate different troubles, we will try to detail the main ones.

What to do if the glow plug light comes on while driving on my Volkswagen Golf 8?

A glow light that comes on while driving on your Volkswagen Golf 8 or at any other time other than when the engine is started is meant to notify you to a problem other than your spark plugs, we will look at this now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to carefully translate the reason for the light up of your glow light.

My Volkswagen Golf 8 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 Volkswagen Golf 8 and that you also experience a loss of power. In this case, different complications can describe its lightning. Here is a list of the main motives:

  • Trouble 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 Volkswagen Golf 8 because it is one of the issue of which it is meant to alert 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 disturbance in the performance of the turbo.
  • Issue 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 disturb its proper function.
  • Finally, the last problem that could lead to a glow indicator light on your Volkswagen Golf 8 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 Volkswagen Golf 8

Finally, we’ll give you the causes for a glow plug light that comes on on your Volkswagen Golf 8 without you feeling any difference in power or vehicle behaviour. Ordinarily, this is an electronic problem:

  • 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 get rid of the problem.
  • You have a false contact somewhere in your electrical circuit, test the other solutions first because it is not easy to find it alone, we advise you to go to your technician.
  • Faulty injection pressure sensor, ECU error

    • If you wish more tutorials on the Volkswagen Golf 8, go to our Volkswagen Golf 8 category.