Conditions for Running the DTC

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Q77B Transmission Control Solenoid Valve 2 = Enabled
Battery Voltage = Greater than 9 V
Engine Speed = Greater than 499 RPM
High Side Driver 1, 2 = On
Ignition and Start Signal = 9 to 32 V
Ignition and Start Switch Signal = On
Input Shaft Speed Sensor = Greater than 300 RPM
Transmission Fluid Temperature = Greater than 0°C (32°F)
Transmission Service Fast Learn = Disabled

Frequency the DTC runs = Continuously - After the running conditions are met