A new light on your dashboard? You don’t figure out why it doesn’t switch off… It’s typical, an automobile is complex and there are many reasons why a light might come on. If it turns out your glow plug light comes on while driving your Mercedes Gla, it may indicate some concerns. In the following paragraphs, we will do everything we can to help you see things more clearly. First, we will see how the preheating light on your Mercedes Gla operates, and then the different causes it lights up when you are driving

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What is the role of my Mercedes Gla glow plug light?

The main purpose 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 effectively. In reality, it must light up when you switch on your Mercedes Gla 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 automobile. But, if it comes on while driving, it may indicate multiple troubles, we will try to point out the most important ones.

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

A glow light that comes on while driving on your Mercedes Gla or at any other time other than when the engine is started is intended to warn you to a problem other than your spark plugs, we will take a look at this now. In any case, plug in your car to the diagnostic tool will allow you to carefully interpret the cause for the light up of your glow light.

My Mercedes Gla glow light comes on and I’m having a loss of power

The first situation is that you notice that your glow plug light comes on while driving your Mercedes Gla and that you also knowledge a loss of power. In such a case, some trouble can explain its lightning. 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 case, it is logical that your preheat light comes on while driving on Mercedes Gla because it is one of the failures of which it is designed to warn you. Have the status of your valve looked at
  • Trouble related to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can result in turbo boost and a perturbation 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 broken by filings or other possible foreign bodies that affect its proper performance.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes Gla 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 Gla

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

  • 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 problem.
  • You have a false contact somewhere in your electrical circuit, check the other options first because it is not easy to find it alone, we suggest you to go to your auto mechanic.
  • Faulty injection pressure sensor, ECU error
  • In the event that you have any further questions about the Mercedes Gla, do not hesitate to consult our Mercedes Gla category.