Pinpoint Test AK: The Fuel Maintenance Mode Or Oil Maintenance Mode Message Is Never Displayed (PHEV (Plug-In Hybrid Electric Vehicle))

AK1 CHECK THE MESSAGE CENTER OPERATION
- Ignition ON.
- Close all doors and the liftgate.
- Clear all message center warnings by pressing the OK button for each warning present.
- Monitor the door ajar message center warning indicator.
- Open the driver door.
- Clear the message center popup warning.
- Monitor the door ajar message center warning indicator.
Is the door ajar message center warning indicator off with the door closed, and on with the door open?
- Yes
- No : INSTALL a new IPC .
  REFER to: INSTRUMENT PANEL CLUSTER (IPC) .
AK2 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Using a diagnostic scan tool, perform the IPC self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
- Yes : REFER to DTC CHART: IPC .
- No : GO to AK3
AK3 PERFORM THE PCM (POWERTRAIN CONTROL MODULE) SELF-TEST
- Using a diagnostic scan tool, perform the PCM self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
- Yes : REFER to: ELECTRONIC ENGINE CONTROLS - PLUG-IN HYBRID ELECTRIC VEHICLE (PHEV) .
- No : GO to AK4
AK4 PERFORM THE GWM (GATEWAY MODULE A) SELF-TEST
- Using a diagnostic scan tool, perform the GWM self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
- Yes : REFER to: COMMUNICATIONS NETWORK .
- No : If the check fuel fill inlet message is never on, the system is operating correctly at this time. There are currently no vehicle concerns present that require the check fuel fill inlet message display. If the check fuel fill inlet message is always on, INSTALL a new PCM .
  REFER to: POWERTRAIN CONTROL MODULE (PCM) .