A new light on your dashboard? You don’t understand why it doesn’t turn off… It’s normal, an automobile is complicated and there are many reasons why a light might occur. In the event that your glow plug light comes on while driving your GMC Yukon XL, it might signal some things. In the following paragraphs, we will do anything we can to support you see things more clearly. First, we will find out how the preheating light on your GMC Yukon XL operates, and then the different reasons it lights up when you are driving

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What is the role of my GMC Yukon XL glow plug light?

The primary goal of the engine glow plug light, which is in most cases represented by a yellow coil, is to guarantee that your glow plugs are working properly. In reality, it must light up when you switch on your GMC Yukon XL 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 supposed to stay or come on while driving with your car. Nevertheless, if it comes on while driving, it may indicate different troubles, we will try to summarize the most important ones.

What to do if the glow plug light comes on while driving on my GMC Yukon XL?

A glow light that comes on while driving on your GMC Yukon XL or at any other time other than when the engine is started is meant to alert you to a problem other than your spark plugs, we will check out this right now. Whatever the case, a switch to the diagnostic tool will allow you to accurately interpret the motive for the light up of your glow light.

My GMC Yukon XL glow light comes on and I’m encountering a loss of power

The first possibility is that you identify that your glow plug light comes on while driving your GMC Yukon XL and that you also encounter a loss of power. In this instance, some complications can demonstrate its presence. Here is a list of the most important reasons:

  • Issue of EGR valve, in reality, if you are affected a loss of power, it is possible that your EGR valve is blocked, in this instance, it is obvious that your preheat light comes on while driving on GMC Yukon XL because it is one of the issue of which it is intended to warn you. Have the status of your valve examined
  • Problem related 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.
  • Problem in connection with the injection, either an injector that has seized up or the injection pump that is destroyed 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 GMC Yukon XL coupled with a loss of power, is that your fuel filter is too dirty, you should experience 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 GMC Yukon XL

To finish , we’ll give you the reasons for a glow plug light that comes on on your GMC Yukon XL without you feeling any difference in power or car 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 trouble.
  • 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 recommend you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error
  • If you wish more tutorials on the GMC Yukon XL, go to our GMC Yukon XL category.