A new warning light on your dashboard? You don’t find out why it doesn’t shut off… It’s normal, a vehicle is complex and there are multiple motives why a light may come on. If it turns out your glow plug light comes on while driving your Land Rover Discovery, it may signal different things. On this page, we will do anything we can to support you see things more clearly. First, we will find out how the preheating light on your Land Rover Discovery works, and then the different causes it lights up when you are driving

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What is the goal of my Land Rover Discovery glow plug light?

The main goal of the engine glow plug light, which is most of the time represented by a yellow coil, is to guarantee that your glow plugs are working correctly. In fact, it must light up when you switch on your Land Rover Discovery 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 meant to stay or come on while driving with your vehicle. However, if it turns on while driving, it may show different failures, we will try to point out the main ones.

What to do if the glow plug light comes on while driving on my Land Rover Discovery?

A glow light that comes on while driving on your Land Rover Discovery or at any other time other than when the engine is started is designed to alert you to a fault other than your spark plugs, we will take a look at this right now. Whatever the case, a switch to the diagnostic tool will allow you to precisely translate the explanation for the light up of your glow light.

My Land Rover Discovery glow light comes on and I’m going through a loss of power

The first probability is that you detect that your glow plug light comes on while driving your Land Rover Discovery and that you also encounter a loss of power. In such a case, different complications can describe its lightning. Here is a list of the main motives:

  • Problem of EGR valve, in fact, if you are affected a loss of power, it is possible that your EGR valve is blocked, in this instance, it is rational that your preheat light comes on while driving on Land Rover Discovery because it is one of the failures of which it is designed to notify you. Have the status of your valve looked at
  • Problem associated with the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can cause turbo boost and a perturbation in the operation of the turbo.
  • Problem associated with the injection, either an injector that has seized up or the injection pump that is malfunctioned by filings or other possible foreign bodies that affect its proper performing.
  • Finally, the last issue that could lead to a glow indicator light on your Land Rover Discovery 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 Land Rover Discovery

Finally, we’ll give you the causes for a glow plug light that comes on on your Land Rover Discovery without you feeling any difference in power or vehicle behaviour. In most cases, 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 resolve the issue.
  • 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 repair shop.
  • Faulty injection pressure sensor, ECU error

    • To get more tips on the Land Rover Discovery, take a look at the Land Rover Discovery category.