We cannot overstate this: If your check engine light is flashing, pull over immediately and turn off your engine. In most automobiles, a flashing check engine light means there is a serious problem with the engine. Naturally, if you keep driving the car, truck, or utility vehicle, you run a high risk of damaging the engine irreparably. Let’s talk more about the check engine light below.
How the Light Works
The check engine light has been around for a very long time. It turns on when there is a problem in the engine or with a system that has no other way to warn you. For example, your transmission cannot let you know it is having a problem unless the check engine light turns on. There is no other light or gauge for the transmission. The light is basically a catch-all.
All of the dashboard warning lights are controlled by your vehicle’s main computer chip. This chip is called the engine control module or unit. The module is designed to communicate with the system sensors so that there is a constant discussion about how your vehicle is running while it is running. If there is a problem, the sensor associated with the system will report an error.
The engine control module takes this error and comes up with a game plan. If it can fix the problem on its own, it will do that. If it cannot fix the problem, it will determine the best way to alert you that something is wrong with your automobile. The best way to do this is to turn on the associated dashboard warning light. This is how the check engine light works.
Why It Turns On
We mentioned above that the check engine light will come on if there is a problem with your transmission. This is just one reason why the light will turn on. In most cases, the light will remain steady. This is to let you know there is a problem that requires immediate attention but is not an emergency. Again, if the light is flashing, you have an emergency.
Aside from the transmission, other reasons why the check engine light will turn on include problems with the catalytic converter or the exhaust system, problems with the fuel system, problems with the EVAP control system, a malfunctioning MAF or O2 sensor, or worn spark plugs. The check engine light can also turn on if your engine has developed a vacuum leak.
Bring your vehicle to our shop right away if you have an illuminated check engine warning on the dashboard. We will find what’s wrong and fix it.