The ABS light coming on can either be a normal part of the system’s functionality or signal an issue. When you insert the key and power up the system, the ABS light should briefly illuminate on the dashboard. This momentary light confirms that the system is active and error-free. However, in certain trucks, you might only see the light activate when the trailer is initially connected. If the ABS light remains on after a few seconds when the system powers up, it could signal a brake issue. Similarly, if the light illuminates and stays on while driving, it is a likely indication of a problem. In such situations, an inspection of the system and a diagnosis of the issue will be necessary.