DTC C101F: Generic Valve Failure: Action
WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
This DTC sets in continuous memory if the ABS module plausibility monitor of the hydraulic valves in the HCU determines degraded valve performance due to operating temperatures greater than 195°C (383°F). This is most likely due to extended ABS usage (Hill Descent Control, traction control, ESC or RSC) without allowing sufficient time for the system and components to cool. SET the ignition to OFF and ALLOW the vehicle to cool for at least 30 minutes.