No Torque Converter Clutch Apply

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Causes
Torque Converter (14)	Inspect for damaged Torque Converter Clutch Seal (inside converter assembly). Diagnose Torque Converter Assembly for possible internal damage. Refer to: Torque Converter Diagnosis (LTG) , or Torque Converter Diagnosis (LGX)
Automatic Transmission Fluid Pump Assembly (201)	Inspect for worn or damaged Torque Converter Fluid Seal Assembly (301). Inspect for worn, damaged or sticking Torque Converter Clutch Control Valve (333) or Torque Converter Clutch Regulator Apply Valve (337). Refer to: Transmission Fluid Pump Disassemble , and Transmission Fluid Pump Assemble
Torque Converter and Differential Housing (13)	Inspect for leaking or damaged Torque Converter Fluid Seal (210), and Automatic Transmission Fluid Pump Assembly (201).