Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

Ignition - On/Vehicle - In Service Mode
Verify DTC P0641, P1255, P129F, P12A6 is not set.
- If any of the DTCs are set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If none of the DTCs are set
Engine - Running
Verify the scan tool parameter: Fuel Pressure Sensor = 7 to 751 kPa (1 to 109 PSI)
- If not between 7 and 751 kPa (1 and 109 PSI)
  Refer to: Circuit/System Testing
- Go to next step: If between 7 and 751 kPa (1 and 109 PSI)
Verify the scan tool parameter: Fuel Pressure Sensor = The value should not spike or drop out.
Perform the action while monitoring the parameter:
- Wiggle the harness and connector: B47 Fuel Pressure Sensor
- Wiggle the harness and connector: K111 Fuel Pump Power Control Module
- If the value spikes or drops out
  Repair as necessary - Wiring/Terminal(s)/Electrical Connector(s)
- Go to next step: If the value does not spike or drop out
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
  Refer to: Circuit/System Testing
- Go to next step: If the DTC does not set
All OK.