Diagnostic Fault Information

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.

NOTE:

The components are listed from the least to the most intrusive to service.

Component	DTC	Condition
Q77A Transmission Control Solenoid Valve 1	P0746, P0747	Binding, sticking or stuck component: Solenoid Valve Damaged or missing component: Retaining Clip Solenoid Valve
1-2-3-4-5-6 Clutch Regulator Valve Valve Spring Valve Body Bore	P0746, P0747	Binding, sticking or stuck component: Valve Debris on the component. Damaged component: Valve or Bore - Scored Spring
1-2-3-4-5-6 Clutch Boost Valve Valve Spring Valve Spring	P0746, P0747	Binding, sticking or stuck component: Valve Debris on the component. Damaged component: Valve or Bore - Scored Spring
1-2-3-4-5-6 Clutch Assembly - Oil Feed Circuit	P0746, P0747	Blocked or restricted component: - Fluid/oil passage Leaking component: Gasket O-Ring Seal
1-2-3-4-5-6 Clutch Assembly	P0746, P0747	Blocked or restricted component: - Fluid/oil passage Leaking component: Clutch Piston Clutch Housing Gasket O-Ring Seal Binding, sticking or stuck component: Clutch Plates Damaged or worn component: Clutch Plates Clutch Piston Clutch Housing