![]() When the ABS light comes on due to an underinflated tire, the low tire pressure warning light may also illuminate in vehicles equipped with TPMS (Tire Pressure Monitoring System). When the speed difference between the wheels is detected by the control module, an ABS fault code is triggered for the speed sensor of the wheel with low tire pressure. The diameter of the wheel is reduced when its tire is underinflated, this causes the wheel to spin faster than other wheels in the vehicle. Low tire pressure in one of the wheels of Ford F-450 Super Duty can cause the ABS light to turn on. ABS control units are fairly reliable and typically last at least 100,000 miles. ![]() Connect a diagnostic device to your vehicle to read the code. A malfunction in the ABS pump can cause the ABS light to illuminate in F-450, and a fault code is stored in the memory. ![]() When you brake hard at high speed and the wheels lock, the hydraulic part of the unit actuates the valves to reduce hydraulic pressure to the brake at the affected wheels. The ABS pump, also called Hydraulic Control Unit (HCU), consists of an electronic and a mechanical-hydraulic part. Check the condition of the brake pads and rotors, also see if there is any sign of fluid leak under your vehicle and on the wheel hubs. The three common causes of low brake fluid are worn brake pads, worn rotors, and a leak in the system. But it is important to further investigate the reason for low brake fluid level. In case the brake fluid level is low, topping it off should turn off the ABS warning light in F-450. Before replacing the sensor, the wiring and connectors of the affected sensor should be physically inspected for any signs of damage or corrosion. It is possible the sensor is functioning properly in your F-450, but the signal is interrupted due to damaged wire or corroded connector. Damaged speed sensor wire, or bad connector Note: Make sure the code reader you are using can read your vehicle’s ABS codes. The faulty sensor must be replaced to resolve the issue. The error code also makes it easy to determine which sensor is affected. The only most reliable method of diagnosing an ABS speed sensor is by connecting an OBDII scanner to your vehicle and reading out the error codes. It isn’t usually possible to identify the faulty ABS sensor in F-450 by physical inspection. Bad wheel speed sensor is one of the leading causes of ABS warning light in F-450, as they are exposed to harsh conditions due to their close proximity to the wheels.
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