A new warning light on your dashboard? You don’t find out why it doesn’t switch off… It’s normal, a car is elaborate and there are multiple causes why a light could come on. If your glow plug light comes on while driving your Cadillac DTS, it may possibly reveal some issues. In this article, we will do anything we can to help you see things more clearly. First, we will find out how the preheating light on your Cadillac DTS operates, and then the different motives it lights up when you are driving

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

The main role of the engine glow plug light, which is most of the time symbolized by a yellow coil, is to ensure that your glow plugs are working properly. In fact, it must light up when you switch on your Cadillac DTS to tell you that they are heating the intake air in your cylinders and must go out after a few moments when the engine is running. This preheat light is therefore not supposed to stay or come on while driving with your motor vehicle. But, if it comes on while driving, it may reveal different failures, we will try to describe the most important ones.

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

A glow light that comes on while driving on your Cadillac DTS or at any other time other than when the engine is started is meant to inform you to a fault other than your spark plugs, we will check out this now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to properly interpret the motive for the light up of your glow light.

My Cadillac DTS glow light comes on and I’m having a loss of power

The first possibility is that you recognize that your glow plug light comes on while driving your Cadillac DTS and that you also experience a loss of power. In this case, some trouble can describe its presence. Here is a list of the most important causes:

  • Issue of EGR valve, indeed, if you undergo a loss of power, it is possible that your EGR valve is blocked, in this case, it is expected that your preheat light comes on while driving on Cadillac DTS because it is one of the issue of which it is meant to warn you. Have the status of your valve tested
  • Issue related 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 operation of the turbo.
  • Issue relevant to 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 operation.
  • Finally, the last problem that could lead to a glow indicator light on your Cadillac DTS coupled with a loss of power, is that your fuel filter is too dirty, you should encounter 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 DTS

Finally, we’ll give you the motives for a glow plug light that comes on on your Cadillac DTS without you feeling any difference in power or motor vehicle behaviour. Ordinarily, this is an electronic fault:

  • Glow plug relays or fuses to be replaced, 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 problem.
  • You have a false contact somewhere in your electrical circuit, test out the other options first because it is not easy to find it alone, we recommend you to go to your repair shop.
  • Faulty injection pressure sensor, ECU error

    • If you need more tutorials on the Cadillac DTS, go to our Cadillac DTS category.