This code usually appears during a scan (often using software like FORScan ) even if a "Check Engine" light is not active, as it primarily affects comfort rather than critical engine performance.
: A software glitch in the Integrated Trailer Module can cause a loss of trailer brake function and turn signal illumination. ford b166a60
On many Fords, after replacing the seat cover, mat, or even disconnecting the battery, the OCS loses its "empty seat" reference. Using FORScan or a high-end scan tool, navigate to . Follow the on-screen instructions (typically: empty seat, engine off, key on, wait 20 seconds). This code usually appears during a scan (often