Anti-lock brake system (ABS) Malfunction Indicator Lamp (MIL) illuminated
Summary
The Office of Defects Investigation (ODI) received a petition on December 22, 2025, requesting a defect investigation into the hydraulic control unit (HCU) for the Anti-lock Braking System (ABS) on the MY 2010 Ford Fusion Hybrid. The petition alleges that an illuminated ABS MIL is associated with a failure of the ABS HCU, resulting in ABS malfunction, loss of traction and electronic stability control functions, and reduced braking performance, particularly on slippery road surfaces. ODI conducted an analysis of complaints submitted to ODI for the subject vehicle population along with data submitted by Ford. The Petitioner alleged that the condition in the subject vehicles was comparable to the defect addressed by NHTSA recall No. 19V904, which covered certain MY 2006-2010 Ford Fusion, Mercury Milan, and Lincoln MKZ vehicles. The population of this recall consisted of the non-hybrid variants of these models. The recall addressed a defect where the ABS valves in the HCU could remain stuck open due to a chemical reaction with aged DOT 3 brake fluid, potentially causing extended brake pedal travel and increasing the risk of a crash.  DOT 3 brake fluid is a conventional, glycol-ether-based hydraulic fluid used to transfer force from the brake pedal to a vehicle's brakes. No visual or audible warning was presented to the driver in this scenario. The MY 2010 Ford Fusion Hybrid is equipped with a different brake apply system in which the traditional hydraulic (friction) brak…