A new light on your dashboard? You don’t find out why it doesn’t turn off… It’s normal, an auto is complex and there are various causes why a light could come on. If it turns out your glow plug light comes on while driving your Scion tC, it may suggest different things. In this post, we will do anything we can to support you see things more clearly. First, we will find out how the preheating light on your Scion tC operates, and then the different explanations it lights up when you are driving

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What is the goal of my Scion tC glow plug light?

The primary role of the engine glow plug light, which is generally symbolized by a yellow coil, is to assure that your glow plugs are working correctly. In reality, it must light up when you switch on your Scion tC 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 car. Nevertheless, if it comes on while driving, it may reveal different troubles, we will try to summarize the main ones.

What to do if the glow plug light comes on while driving on my Scion tC?

A glow light that comes on while driving on your Scion tC or at any other time other than when the engine is started is intended to warn you to a fault other than your spark plugs, we will look at this now. Whatever the case, a switch to the diagnostic tool will allow you to accurately understand the reason for the light up of your glow light.

My Scion tC glow light comes on and I’m experiencing a loss of power

The first situation is that you identify that your glow plug light comes on while driving your Scion tC and that you also encounter a loss of power. In this case, different concerns can explain its lightning. Here is a list of the main causes:

  • Problem of EGR valve, indeed, if you are affected a loss of power, it is possible that your EGR valve is blocked, in such a case, it is rational that your preheat light comes on while driving on Scion tC because it is one of the issue of which it is supposed to warn you. Have the status of your valve inspected
  • Issue associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can cause turbo boost and a perturbation in the operation of the turbo.
  • Issue 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 problem that could lead to a glow indicator light on your Scion tC 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 Scion tC

To finish , we’ll give you the explanations for a glow plug light that comes on on your Scion tC without you feeling any difference in power or car behaviour. In most cases, this is an electronic fault:

  • 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 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 suggest you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error
  • If you wish more guides on the Scion tC, go to our Scion tC category.