A new warning light on your dashboard? You don’t find out why it doesn’t turn off… It’s typical, a vehicle is complicated and there are many motives why a light may come on. If it turns out your glow plug light comes on while driving your Volkswagen Passat 8, it may suggest different problems. On this page, we will do anything we can to help you see things more clearly. First, we will see how the preheating light on your Volkswagen Passat 8 works, and then the different causes it lights up when you are driving

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What is the goal of my Volkswagen Passat 8 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 correctly. In reality, it must light up when you switch on your Volkswagen Passat 8 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 expected to stay or come on while driving with your motor vehicle. However, if it comes on while driving, it may show several issues, we will try to explain the main ones.

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

A glow light that comes on while driving on your Volkswagen Passat 8 or at any other time other than when the engine is started is intended to warn you to a fault 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 precisely understand the explanation for the light up of your glow light.

My Volkswagen Passat 8 glow light comes on and I’m experiencing a loss of power

The first situation is that you detect that your glow plug light comes on while driving your Volkswagen Passat 8 and that you also experience a loss of power. In such a case, different trouble can explain its lightning. Here is a list of the main motives:

  • Trouble of EGR valve, indeed, if you suffer a loss of power, it is possible that your EGR valve is blocked, in this case, it is obvious that your preheat light comes on while driving on Volkswagen Passat 8 because it is one of the failures of which it is designed to warn you. Have the status of your valve checked out
  • Problem associated with the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can lead to turbo boost and a perturbation in the performance of the turbo.
  • Problem linked 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 disrupt its proper functioning.
  • Finally, the last trouble that could lead to a glow indicator light on your Volkswagen Passat 8 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 Volkswagen Passat 8

To finish , we’ll give you the causes for a glow plug light that comes on on your Volkswagen Passat 8 without you feeling any difference in power or motor vehicle behaviour. In general, this is an electronic fault:

  • 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 fix the trouble.
  • You have a false contact somewhere in your electrical circuit, test the other options first because it is not easy to find it alone, we encourage you to go to your technician.
  • Faulty injection pressure sensor, ECU error
  • If you want more tutorials on the Volkswagen Passat 8, go to our Volkswagen Passat 8 category.