Chrysler
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    TTS - No Temperature Rise After Startup Conditions
Cause:
    Engine running (transmission hot) for 10 minutes, then the PCM detected that the TTS input did not increase at least 16-F after startup, or that the initial TTS input started below 40°F and did not change, or with ECT sensor and BTS inputs below 100°F, that the TTS input was over 260°F

Generic
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Transmission Fluid Temperature Sensor "A" Circuit Range/Performance

GM
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    TFT Sensor Range Performance Conditions
Cause:
    Engine running, ECT sensor input less than 80°F after exceeding 160°F, ECT and IAT sensor inputs within 10°F of each other, then the PCM detected that the TFT sensor input was within 10°F of the IAT sensor input during startup, condition met on 2 ignition cycles