Ford
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Transmission Switch Conditions
Cause:
    Engine running and PCM detected that a particular switch signal did not change when the vehicle was shifted into or out of the gear position (switch status high instead of low)

Generic
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Reverse Output Circuit