The engine control module (ECM), your vehicle’s main computer chip, is what actually turns on the check engine light. A recent study demonstrated that the check engine light is quite accurate in reporting engine problems. As such, Sellers Automotive advises that you head straight to our shop if your check engine light turns on. If the light is blinking, do not drive your automobile. A blinking check engine light is a sign of serious engine damage. Let’s talk more about the check engine light below.
The Engine Control Module and System Sensors
You know that today’s automobiles are computers on wheels. These vehicles are equipped with the engine control module and system sensors that communicate to each other the entire time your vehicle is running. When you first start your car, truck, or utility vehicle, you may have noticed that all of the dashboard lights turn on temporarily. This is because the system sensors are giving the engine control module the thumbs up.
If anything goes wrong, a system sensor will alert the ECM by sending it an error code. For example, assume for the moment that your vehicle’s oxygen sensor has died. It will send an error code to the ECM before it dies. Because the ECM cannot correct the problem, i.e., replace the oxygen sensor, it will turn on the check engine light. If your anti-lock brake system sensor reports a problem to the ECM that it cannot correct, it will turn on the ABS light.
Causes of a Check Engine Dashboard Warning
The above are examples of how the engine control module and system sensors work. You already know from these examples that a faulty oxygen sensor will turn on the check engine light. Anything that does not have the dashboard warning light of its own will cause the check engine light to turn on if its system sensor sends an error code to the ECM. For example, you may end up with an illuminated check engine light on the dashboard if
- The catalytic converter goes bad and malfunctions
- There is a problem with the EVAP control system
- There is a problem with the engine control module
- You have a malfunctioning or dirty mass airflow sensor
- You have worn or misfiring spark plugs
- The engine has a leaking vacuum hose
- The transmission is malfunctioning or going bad
All of these things can trigger a check engine warning and require immediate attention. As such, it’s important that you bring your vehicle to Sellers Automotive in Sanford, NC, right away if the check engine light is on. We will find the problem and fix it.