A new light on your dashboard? You don’t understand why it doesn’t turn off… It’s normal, a car is complex and there are many reasons why a light might come on. In the event that your glow plug light comes on while driving your Jeep Grand Cherokee, it might signal several problems. In this article, we will do anything we can to help you see things more clearly. First, we will discover how the preheating light on your Jeep Grand Cherokee operates, and then the different motives it lights up when you are driving

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What is the goal of my Jeep Grand Cherokee glow plug light?

The primary role of the engine glow plug light, which is in most cases represented by a yellow coil, is to assure that your glow plugs are working correctly. In fact, it must light up when you switch on your Jeep Grand Cherokee 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 reveal different troubles, we will try to detail the most important ones.

What to do if the glow plug light comes on while driving on my Jeep Grand Cherokee?

A glow light that comes on while driving on your Jeep Grand Cherokee or at any other time other than when the engine is started is designed to notify you to a fault other than your spark plugs, we will look at this right now. In any case, connecting your vehicle to the diagnostic tool will allow you to properly understand the reason for the light up of your glow light.

My Jeep Grand Cherokee glow light comes on and I’m going through a loss of power

The first possibility is that you identify that your glow plug light comes on while driving your Jeep Grand Cherokee and that you also experience a loss of power. In this instance, several problems can describe its presence. Here is a list of the most important reasons:

  • Trouble of EGR valve, in fact, 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 Jeep Grand Cherokee because it is one of the issue of which it is meant to alert you. Have the status of your valve examined
  • Problem associated with 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 associated 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 affect its proper function.
  • Finally, the last problem that could lead to a glow indicator light on your Jeep Grand Cherokee 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 Jeep Grand Cherokee

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

  • 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 fix the problem.
  • You have a false contact somewhere in your electrical circuit, test out the other options first because it is not easy to find it alone, we encourage you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error
  • To discover more tips on the Jeep Grand Cherokee, take a look at the Jeep Grand Cherokee category.