What causes F 250 Ford super duty abs light to stay on?

1. Low brake fluid. The ABS light may come on if the brake fluid level is low. This is because the ABS system uses brake fluid to create pressure to activate the brakes. If the fluid level is low, the ABS system may not be able to function properly.

2. Faulty wheel speed sensor. The ABS system uses wheel speed sensors to monitor the speed of each wheel. If a wheel speed sensor is faulty, the ABS system may not be able to get accurate readings from the wheels. This can cause the ABS light to come on.

3. Faulty ABS control module. The ABS control module is the brain of the ABS system. It receives signals from the wheel speed sensors and uses them to control the ABS system. If the ABS control module is faulty, the ABS system may not be able to function properly. This can cause the ABS light to come on.

4. Faulty wiring or connections. The ABS system is a complex system with a lot of wiring and connections. If any of the wiring or connections are faulty, the ABS system may not be able to function properly. This can cause the ABS light to come on.

If the ABS light comes on in your Ford F-250 Super Duty, it's important to take it to a qualified mechanic for diagnosis and repair.