The 2021 Ford Explorer's lane keeping system provides both warnings and steering assistance to help prevent unintended lane departures. When a system fault message appears, Ford's ADAS has detected an issue requiring attention beyond normal operating conditions.
Lane Keeping System Components
The Explorer's lane keeping system relies on the forward-facing camera to detect lane markings, the electric power steering system to provide corrective torque, and control modules to coordinate the response. A fault in any component can trigger system fault messages.
What Causes Lane Keeping Faults
Several issues trigger lane keeping system faults. Camera hardware failures prevent lane detection. Windshield replacement without proper calibration misaligns the camera. Electric power steering faults prevent steering assistance. Module communication errors interrupt system coordination. Software glitches may require dealer updates.
Fault vs. Temporary Unavailability
Distinguish between a system fault (actual problem detected) and temporary unavailability (conditions preventing operation). Faults typically display specific warning messages and may illuminate the wrench light or ADAS warning. Unavailability usually shows "not available" without warning lights.
Diagnosing the Fault
Ford's diagnostic system (FORScan or IDS) reads ADAS-specific codes that identify the fault source. Codes may point to camera issues, steering faults, module communication errors, or calibration needs. This specific information guides appropriate repair.