Ford
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    1 to 2 Shift Error Conditions
Cause:
    Engine running in gear with VSS signals received, then the PCM detected that the engine speed (rpm) did not drop during the transmission 1-2 up-shift event

Generic
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    1-2 Shift

GM
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Transaxle Shift Solenoid 2 Performance Conditions
Cause:
    Engine running, 1st gear commanded on, no noise detected on the TSS or VSS signals, VSS over 3 mph, TSS over 224 rpm, speed ratio across the torque converter less than 180, Calculated Engine Load value over 20%, then the PCM detected twice that the ratio of TSS to VSS equaled that of the second gear input