Diagnostic Fault Information

WARNING: This page is about a different car, the 2020 GMC Terrain and 2020 Chevrolet Equinox. 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
Q77D Transmission Control Solenoid Valve 4	P18A8	Binding, sticking or stuck component: Solenoid Valve Damaged or missing component: Retaining Clip Solenoid Valve
M123 Transmission Park Valve Lock Solenoid Actuator	P18A8	Binding, sticking or stuck component: Valve Debris on the component. Damaged component: Valve or Bore - Scored Spring
Control Valve Body Mode 2 Electronic Transmission Range Selector Valve Electronic Transmission Range Selector Mode Enable Valve/Spring Control Valve Body Spacer Plate Feed Limit Valve/Spring Clutch Selector Valve/Spring	P18A8	Binding, sticking or stuck component: Valve Debris on the component. Damaged component: Valve or Bore - Scored Spring
Control Solenoid Valve Body Mode 1 Electronic Transmission Range Selector Valve	P18A8	Binding, sticking or stuck component: Valve Debris on the component. Damaged component: Valve or Bore - Scored Spring