A new warning light on your dashboard? You don’t figure out why it doesn’t turn off… It’s normal, a vehicle is complicated and there are many motives why a light could come on. If it turns out your glow plug light comes on while driving your Mercedes Cla, it may possibly point out some problems. In this post, we will do everything we can to support you see things more clearly. First, we will discover how the preheating light on your Mercedes Cla operates, and then the different reasons it lights up when you are driving

glow-plug-light-mercedes-cla

What is the goal of my Mercedes Cla glow plug light?

The main goal of the engine glow plug light, which is generally represented by a yellow coil, is to assure that your glow plugs are working effectively. Indeed, it must light up when you switch on your Mercedes Cla 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 motor vehicle. However, if it turns on while driving, it may indicate several 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 Cla?

A glow light that comes on while driving on your Mercedes Cla or at any other time other than when the engine is started is designed to warn you to a problem other than your spark plugs, we will look at this now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to precisely understand the motive for the light up of your glow light.

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

The first probability is that you detect that your glow plug light comes on while driving your Mercedes Cla and that you also encounter a loss of power. In this instance, some trouble can explain its lightning. Here is a list of the most important motives:

  • Issue of EGR valve, indeed, if you go through a loss of power, it is possible that your EGR valve is clogged, in this case, it is expected that your preheat light comes on while driving on Mercedes Cla because it is one of the problem of which it is supposed to notify you. Have the status of your valve tested
  • Trouble linked to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can bring about turbo boost and a perturbation in the performance of the turbo.
  • Trouble relevant to the injection, either an injector that has seized up or the injection pump that is damaged by filings or other possible foreign bodies that disrupt its proper performing.
  • Finally, the last trouble that could lead to a glow indicator light on your Mercedes Cla 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 Mercedes Cla

Finally, we’ll give you the reasons for a glow plug light that comes on on your Mercedes Cla without you feeling any difference in power or motor vehicle behaviour. Generally, this is an electronic problem:

  • Glow plug relays or fuses to be changed, 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 resolve the trouble.
  • You have a false contact somewhere in your electrical circuit, check the other solutions first because it is not easy to find it alone, we suggest you to go to your repair shop.
  • Faulty injection pressure sensor, ECU error
  • Whenever you have any additional questions about the Mercedes Cla, do not hesitate to consult our Mercedes Cla category.