A new light on your dashboard? You don’t figure out why it doesn’t switch off… It’s normal, a vehicle is complex and there are various factors why a light could come on. In the event that your glow plug light comes on while driving your Volkswagen Passat 7, it might signal different problems. 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 Volkswagen Passat 7 functions, and then the different causes it lights up when you are driving

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What is the goal of my Volkswagen Passat 7 glow plug light?

The main goal of the engine glow plug light, which is generally symbolized by a yellow coil, is to ensure that your glow plugs are working effectively. In fact, it must light up when you switch on your Volkswagen Passat 7 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 expected to stay or come on while driving with your motor vehicle. Nevertheless, if it turns on while driving, it may reveal multiple failures, we will try to detail the most important ones.

What to do if the glow plug light comes on while driving on my Volkswagen Passat 7?

A glow light that comes on while driving on your Volkswagen Passat 7 or at any other time other than when the engine is started is designed to inform you to a fault other than your spark plugs, we will check out this now. In any case, plug in your car to the diagnostic tool will allow you to precisely understand the explanation for the light up of your glow light.

My Volkswagen Passat 7 glow light comes on and I’m having a loss of power

The first probability is that you notice that your glow plug light comes on while driving your Volkswagen Passat 7 and that you also experience a loss of power. In such a case, different concerns can describe its lightning. Here is a list of the most important factors:

  • Problem of EGR valve, indeed, if you are affected a loss of power, it is possible that your EGR valve is blocked, in such a case, it is rational that your preheat light comes on while driving on Volkswagen Passat 7 because it is one of the problem of which it is designed to notify you. Have the status of your valve checked
  • Trouble linked to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can lead to turbo boost and a disturbance in the performance of the turbo.
  • Trouble 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 performance.
  • Finally, the last problem that could lead to a glow indicator light on your Volkswagen Passat 7 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 Passat 7

To finish , we’ll give you the causes for a glow plug light that comes on on your Volkswagen Passat 7 without you feeling any difference in power or motor vehicle behaviour. Ordinarily, 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 get rid of the problem.
  • You have a false contact somewhere in your electrical circuit, check the other solutions first because it is not easy to find it alone, we recommend you to go to your repair shop.
  • Faulty injection pressure sensor, ECU error

    • If you wish more guides on the Volkswagen Passat 7, go to our Volkswagen Passat 7 category.