Diagnostic Fault Information

WARNING: This page is about a different car, the 2023 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

DTC P0776 will set with a hydraulic/mechanical condition.
DTC P0777 will set with a hydraulic/mechanical condition or high resistance in the circuit of the component Q77B without setting component/control circuit DTCs.
The components are listed from the least to the most intrusive to service.
Verify the conditions listed in the table do not exist

Component	DTC	Condition
Q77B Transmission Control Solenoid Valve 2	P0776, P0777	Binding, sticking or stuck component: Solenoid Valve Damaged or missing component: Retaining Clip Solenoid Valve
2-9 Clutch Regulator Valve Valve Spring Valve Body Bore	P0776, P0777	Binding, sticking or stuck component: Valve Debris on the component. Damaged component: Valve or Bore - Scored Spring
2-9 Clutch Assembly - Oil Feed Circuit	P0776, P0777	Blocked or restricted component: Fluid/oil passage Leaking component: Gasket O-Ring Seal
2-9 Clutch Assembly	P0776, P0777	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