If your ECM computer is not functioning properly, you may need to reset it. There are a few ways to do this, depending on the make and model of your vehicle.
One way to reset your ECM is to disconnect the battery for about 30 seconds. This will allow the computer to reset itself and hopefully clear any errors that it has.
Another way to reset your ECM is to use a diagnostic tool, such as a code reader or scanner. This will allow you to access the computer and clear any codes or errors that it has.
If you are having persistent problems with your ECM, you may need to take it to a mechanic or dealership to have it reset or replaced.