What you likely want to do is one of the following:
* Reset the check engine light: This doesn't reset the ECM itself, but clears the diagnostic trouble codes (DTCs) stored in its memory. The light comes on when the ECM detects a problem. Clearing the codes doesn't fix the problem, but it turns the light off. You can usually do this by disconnecting the battery's negative terminal for a few minutes (30 seconds to a couple of minutes is usually sufficient), or using an OBD-II scanner to clear the codes.
* Reset the radio presets: This is usually done via buttons on the radio itself; the method varies depending on the radio model. Consult your owner's manual for the specific instructions for your radio.
* Reset other electronic modules (e.g., the security system): Again, the procedure varies greatly depending on the specific system. Consult your owner's manual or a repair manual for your truck's year and model.
If you're having a specific problem with your truck (e.g., the engine is running poorly, a warning light is on), describing the problem will help determine what needs to be done. Simply disconnecting the battery for a short period often clears minor issues. However, for persistent problems, professional diagnostics are usually required.
