A new warning light on your dashboard? You don’t understand why it doesn’t switch off… It’s typical, a vehicle is elaborate and there are various motives why a light may occur. If your glow plug light comes on while driving your Mercedes AMG GT, it may show different issues. In this article, we will do anything we can to support you see things more clearly. First, we will find out how the preheating light on your Mercedes AMG GT functions, and then the different causes it lights up when you are driving

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What is the goal of my Mercedes AMG GT glow plug light?

The main role of the engine glow plug light, which is generally symbolized by a yellow coil, is to make sure that your glow plugs are working correctly. In reality, it must light up when you switch on your Mercedes AMG GT 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 vehicle. However, if it comes on while driving, it may indicate several failures, we will try to summarize the main ones.

What to do if the glow plug light comes on while driving on my Mercedes AMG GT?

A glow light that comes on while driving on your Mercedes AMG GT or at any other time other than when the engine is started is designed to alert you to a problem other than your spark plugs, we will look at this right now. No matter the reason, connecting your vehicle to the diagnostic tool will allow you to precisely interpret the motive for the light up of your glow light.

My Mercedes AMG GT glow light comes on and I’m encountering a loss of power

The first probability is that you notice that your glow plug light comes on while driving your Mercedes AMG GT and that you also experience a loss of power. In such a case, different complications can explain its presence. Here is a list of the main motives:

  • Issue of EGR valve, in fact, if you are affected a loss of power, it is possible that your EGR valve is blocked, in such a case, it is obvious that your preheat light comes on while driving on Mercedes AMG GT because it is one of the problem of which it is designed to warn you. Have the status of your valve checked out
  • Trouble related to 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 disturbance in the operation of the turbo.
  • Trouble 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 affect its proper function.
  • Finally, the last issue that could lead to a glow indicator light on your Mercedes AMG GT coupled with a loss of power, is that your fuel filter is too dirty, you should come to feel 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 Mercedes AMG GT

To conclude, we’ll give you the causes for a glow plug light that comes on on your Mercedes AMG GT without you feeling any difference in power or vehicle behaviour. Generally, this is an electronic problem:

  • Glow plug relays or fuses to be replaced, 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 fix the issue.
  • 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 mechanic.
  • Faulty injection pressure sensor, ECU error

    • To get more tips on the Mercedes AMG GT, take a look at the Mercedes AMG GT category.