Diagnostic Fault Information
WARNING: This page is about a different car, the 2021 Cadillac XT6. 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
|