A new warning light on your dashboard? You don’t find out why it doesn’t turn off… It’s normal, a car is complex and there are multiple motives why a light could occur. In cases where your glow plug light comes on while driving your Toyota Corolla, it may indicate some concerns. In the following paragraphs, we will do everything we can to support you see things more clearly. First, we will discover how the preheating light on your Toyota Corolla operates, and then the different motives it lights up when you are driving

glow-plug-light-toyota-corolla

What is the role of my Toyota Corolla glow plug light?

The main goal of the engine glow plug light, which is most of the time symbolized by a yellow coil, is to assure that your glow plugs are working effectively. In fact, it must light up when you switch on your Toyota Corolla 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 meant to stay or come on while driving with your automobile. But, if it comes on while driving, it may reveal several failures, we will try to point out the most important ones.

What to do if the glow plug light comes on while driving on my Toyota Corolla?

A glow light that comes on while driving on your Toyota Corolla 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 check out this right now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to accurately interpret the explanation for the light up of your glow light.

My Toyota Corolla glow light comes on and I’m suffering from a loss of power

The first situation is that you detect that your glow plug light comes on while driving your Toyota Corolla and that you also encounter a loss of power. In such a case, some trouble can explain its presence. Here is a list of the most important motives:

  • Problem of EGR valve, indeed, if you suffer 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 Toyota Corolla because it is one of the issue of which it is intended to notify you. Have the status of your valve checked
  • Problem linked to the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can lead to turbo boost and a perturbation in the performance of the turbo.
  • Problem linked to the injection, either an injector that has seized up or the injection pump that is malfunctioned by filings or other possible foreign bodies that disrupt its proper performance.
  • Finally, the last issue that could lead to a glow indicator light on your Toyota Corolla 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 Toyota Corolla

Finally, we’ll give you the motives for a glow plug light that comes on on your Toyota Corolla without you feeling any difference in power or automobile 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 get rid of the issue.
  • You have a false contact somewhere in your electrical circuit, check the other alternatives first because it is not easy to find it alone, we advise you to go to your auto mechanic.
  • Faulty injection pressure sensor, ECU error

    • To find more tips on the Toyota Corolla, take a look at the Toyota Corolla category.