Diagnostic Fault Information

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

DTC P187D, P187E, P18E7, P18E8 will set with a hydraulic/mechanical condition.
The components are listed from the least to the most intrusive to service.

Component	DTC	Condition
Control Valve Body Default Disable Valve Electronic Transmission Range Select (ETRS) Valve Park Servo Valve Reverse to Park (RTP) Blow Off Valve	P187D, P187E, P18E7, P18E8	Binding or Sticking Debris on the component. Mechanically damaged Missing components
M123 Transmission Park Valve Lock Solenoid Actuator/Park Inhibit Solenoid	P187D, P187E, P18E7, P18E8	Binding or Sticking Debris on the component. Mechanically damaged Missing components

Component

DTC

Condition

Control Valve Body

Default Disable Valve
Electronic Transmission Range Select (ETRS) Valve
Park Servo Valve
Reverse to Park (RTP) Blow Off Valve

P187D, P187E, P18E7, P18E8

Binding or Sticking
Debris on the component.
Mechanically damaged
Missing components

M123 Transmission Park Valve Lock Solenoid Actuator/Park Inhibit Solenoid

P187D, P187E, P18E7, P18E8

Binding or Sticking
Debris on the component.
Mechanically damaged
Missing components