Ford
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Incorrect Ratio for Fourth Gear Conditions
Cause:
    Engine running in 4th gear with VSS signals received, then the PCM detected that the transmission Fourth Gear Ratio was incorrect

Generic
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Gear 4 Incorrect Ratio

GM
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Transaxle - No Fourth Gear Conditions
Cause:
    No Speed Shaft, Noise or VSS codes set, VSS input over 3 mph, TSS over 224 rpm, high line pressure commanded, then the PCM detected, 2 times per ignition cycle, that the ratio failure counter equaled 255 at steady state, or that the shift counter was over 100 during a downshift or an upshift

Nissan
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    AT - fourth gear selection - malfunction
Cause:
    Valve block