A new warning light on your dashboard? You don’t find out why it doesn’t shut off… It’s typical, an automobile is complicated and there are many causes why a light could come on. If it turns out your glow plug light comes on while driving your Cadillac XTS, it may signify some concerns. On this page, we will do anything we can to support you see things more clearly. First, we will discover how the preheating light on your Cadillac XTS operates, and then the different explanations it lights up when you are driving

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What is the role of my Cadillac XTS glow plug light?

The main purpose of the engine glow plug light, which is in most cases represented by a yellow coil, is to assure that your glow plugs are working properly. Indeed, it must light up when you switch on your Cadillac XTS 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 car. However, if it turns on while driving, it may suggest multiple failures, we will try to explain the main ones.

What to do if the glow plug light comes on while driving on my Cadillac XTS?

A glow light that comes on while driving on your Cadillac XTS or at any other time other than when the engine is started is intended to warn you to a problem other than your spark plugs, we will take a look at this right now. In any case, a switch to the diagnostic tool will allow you to precisely interpret the cause for the light up of your glow light.

My Cadillac XTS glow light comes on and I’m encountering a loss of power

The first possibility is that you notice that your glow plug light comes on while driving your Cadillac XTS and that you also knowledge a loss of power. In such a case, some problems can demonstrate its presence. Here is a list of the main causes:

  • Problem of EGR valve, indeed, if you suffer a loss of power, it is possible that your EGR valve is blocked, in this instance, it is rational that your preheat light comes on while driving on Cadillac XTS because it is one of the issue of which it is designed to notify you. Have the status of your valve examined
  • Issue associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can lead to turbo boost and a perturbation in the operation of the turbo.
  • Issue associated with the injection, either an injector that has seized up or the injection pump that is broken by filings or other possible foreign bodies that disturb its proper performance.
  • Finally, the last problem that could lead to a glow indicator light on your Cadillac XTS 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 Cadillac XTS

To conclude, we’ll give you the explanations for a glow plug light that comes on on your Cadillac XTS without you feeling any difference in power or car behaviour. Ordinarily, 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 fix the problem.
  • You have a false contact somewhere in your electrical circuit, check the other options first because it is not easy to find it alone, we recommend you to go to your mechanic.
  • Faulty injection pressure sensor, ECU error

    • To find more tips on the Cadillac XTS, take a look at the Cadillac XTS category.