A new warning light on your dashboard? You don’t find out why it doesn’t turn off… It’s typical, a car is elaborate and there are many reasons why a light could come on. If your glow plug light comes on while driving your Volkswagen Jetta, it may possibly signal some concerns. In this post, we will do everything we can to help you see things more clearly. First, we will find out how the preheating light on your Volkswagen Jetta works, and then the different explanations it lights up when you are driving

glow-plug-light-volkswagen-jetta

What is the role of my Volkswagen Jetta glow plug light?

The main goal of the engine glow plug light, which is generally represented by a yellow coil, is to assure that your glow plugs are working properly. Indeed, it must light up when you switch on your Volkswagen Jetta 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 supposed to stay or come on while driving with your motor 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 Jetta?

A glow light that comes on while driving on your Volkswagen Jetta or at any other time other than when the engine is started is designed to notify you to a problem other than your spark plugs, we will check out this now. Whatever the case, a switch to the diagnostic tool will allow you to properly understand the cause for the light up of your glow light.

My Volkswagen Jetta glow light comes on and I’m going through a loss of power

The first situation is that you identify that your glow plug light comes on while driving your Volkswagen Jetta and that you also encounter a loss of power. In this instance, some concerns can describe its presence. Here is a list of the main reasons:

  • 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 rational that your preheat light comes on while driving on Volkswagen Jetta because it is one of the issue of which it is supposed to notify you. Have the status of your valve tested
  • Trouble associated with the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can result in turbo boost and a perturbation in the performance of the turbo.
  • Trouble relevant 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 affect its proper functioning.
  • Finally, the last issue that could lead to a glow indicator light on your Volkswagen Jetta 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 Jetta

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

  • Glow plug relays or fuses to be changed, 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 issue.
  • 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 suggest you to go to your technician.
  • Faulty injection pressure sensor, ECU error

    • To discover more tips on the Volkswagen Jetta, take a look at the Volkswagen Jetta category.