A new light on your dashboard? You don’t understand why it doesn’t turn off… It’s typical, a car is complex and there are multiple causes why a light may come on. If your glow plug light comes on while driving your Mercedes Benz Sprinter, it might show different problems. In the following paragraphs, we will do anything we can to help you see things more clearly. First, we will find out how the preheating light on your Mercedes Benz Sprinter works, and then the different causes it lights up when you are driving

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What is the role of my Mercedes Benz Sprinter glow plug light?

The primary goal of the engine glow plug light, which is most of the time represented by a yellow coil, is to assure that your glow plugs are working correctly. Indeed, it must light up when you switch on your Mercedes Benz Sprinter 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 supposed to stay or come on while driving with your vehicle. Nevertheless, if it turns on while driving, it may show several failures, we will try to point out the main ones.

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

A glow light that comes on while driving on your Mercedes Benz Sprinter or at any other time other than when the engine is started is designed to notify you to a fault other than your spark plugs, we will check out this now. No matter the reason, connecting your vehicle to the diagnostic tool will allow you to properly interpret the motive for the light up of your glow light.

My Mercedes Benz Sprinter glow light comes on and I’m experiencing a loss of power

The first possibility is that you identify that your glow plug light comes on while driving your Mercedes Benz Sprinter and that you also experience a loss of power. In this case, different concerns can describe its lightning. Here is a list of the main causes:

  • Issue of EGR valve, in fact, if you undergo a loss of power, it is possible that your EGR valve is blocked, in this case, it is rational that your preheat light comes on while driving on Mercedes Benz Sprinter because it is one of the problem of which it is meant to alert you. Have the status of your valve checked
  • Issue related to the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can bring about turbo boost and a disturbance in the performance of the turbo.
  • Issue associated 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 disrupt its proper function.
  • Finally, the last issue that could lead to a glow indicator light on your Mercedes Benz Sprinter coupled with a loss of power, is that your fuel filter is too dirty, you should experience 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 Sprinter

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

  • 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 get rid of the issue.
  • You have a false contact somewhere in your electrical circuit, test out the other solutions first because it is not easy to find it alone, we encourage you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

    • To find more tips on the Mercedes Benz Sprinter, take a look at the Mercedes Benz Sprinter category.