Ford
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Incorrect Ratio for Reverse Gear Conditions
Cause:
    Engine running in reverse gear with VSS signals received, then the PCM detected that the transmission Reverse Gear Ratio was incorrect

Generic
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Reverse Incorrect Ratio