A new warning light on your dashboard? You don’t figure out why it doesn’t switch off… It’s normal, a car is complicated and there are various reasons why a light could come on. If it turns out your glow plug light comes on while driving your Mercedes Benz GLA Class, it might reveal different things. 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 Benz GLA Class works, and then the different reasons it lights up when you are driving

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What is the purpose of my Mercedes Benz GLA Class glow plug light?

The main purpose of the engine glow plug light, which is most of the time symbolized by a yellow coil, is to make sure that your glow plugs are working effectively. In reality, it must light up when you switch on your Mercedes Benz GLA Class 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 expected to stay or come on while driving with your vehicle. However, if it comes on while driving, it may indicate several issues, we will try to describe the main ones.

What to do if the glow plug light comes on while driving on my Mercedes Benz GLA Class?

A glow light that comes on while driving on your Mercedes Benz GLA Class or at any other time other than when the engine is started is meant to warn you to a problem other than your spark plugs, we will take a look at this right now. In any case, connecting your vehicle to the diagnostic tool will allow you to accurately interpret the reason for the light up of your glow light.

My Mercedes Benz GLA Class glow light comes on and I’m suffering from a loss of power

The first situation is that you perceive that your glow plug light comes on while driving your Mercedes Benz GLA Class and that you also encounter a loss of power. In this case, different problems can demonstrate its presence. Here is a list of the main reasons:

  • Issue of EGR valve, in fact, if you suffer a loss of power, it is possible that your EGR valve is clogged, in this case, it is logical that your preheat light comes on while driving on Mercedes Benz GLA Class because it is one of the failures of which it is supposed to warn you. Have the status of your valve checked out
  • Issue associated with 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 perturbation in the operation of the turbo.
  • Issue in connection with the injection, either an injector that has seized up or the injection pump that is damaged by filings or other possible foreign bodies that disturb its proper performing.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes Benz GLA Class 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 Benz GLA Class

To finish , we’ll give you the reasons for a glow plug light that comes on on your Mercedes Benz GLA Class without you feeling any difference in power or vehicle behaviour. In most cases, this is an electronic problem:

  • Glow plug relays or fuses to be swapped out, 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 solve the problem.
  • You have a false contact somewhere in your electrical circuit, test out the other alternatives 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

    • If you wish more tutorials on the Mercedes Benz GLA Class, go to our Mercedes Benz GLA Class category.