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:
The components are listed from the least to the most intrusive to service.
| Component |
DTC |
Condition |
| B280 Automatic Transmission Accumulator Solenoid Valve |
P18AA - During an autostop event |
Leaking |
| Q77D Transmission Control Solenoid Valve 4 |
P187E, P18AA, P18AB, P18AC, P18AD, P18AE, P27EC, P27F0 |
- High resistance in the circuits of the component may set DTC P18AD without setting the DTC for the component: Q77D Transmission Control Solenoid Valve 4
- Binding, sticking or stuck component: Solenoid Valve
- Damaged or missing component:
- Retaining Clip
- Solenoid Valve
|
|
Control Valve Body
- Park Servo Position Switch
- 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
|
P187E, P18AA, P18AB, P18AC, P18AD, P18AE, P27EC, P27F0 |
- Broken Magnets
- 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
|
P187E, P18AA, P18AB, P18AC, P18AD, P18AE, P27EC, P27F0 |
- Broken Magnets
- Binding, sticking or stuck component: Valve
- Debris on the component.
- Damaged component:
- Valve or Bore - Scored
- Spring
|
|
Automatic Transmission Fluid Pump Body
- Automatic Transmission Fluid Pump
- Pressure Regulator Valve
|
P18AB & P18AD |
- Damaged component: Automatic Transmission Fluid Pump
- Binding, sticking or stuck component: Valve
- Debris on the component.
- Damaged component:
- Valve or Bore - Scored
- Spring
|