P04B6

DTC P04B6

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC P04B6 00
- Fuel Fill Door Stuck Closed

Circuit/System Description

The hybrid powertrain control module 2 monitors the voltage values of the fuel fill door open request wake-up signal circuit and the fuel door request signal circuit. When the refuel request switch is pressed, the two switch contacts close. This provide B+ to the Wake-up Circuit input of the hybrid powertrain control module 2 and lowers the voltage on the fuel door request signal circuit input to the hybrid powertrain control module 2. The hybrid powertrain control module 2 detects the voltage on the signal circuits and commands the fuel system to vent and sends a serial data message to the driver information center to display the Wait to Refuel message. The hybrid powertrain control module 2 then energizes the fuel door lock/unlock actuator to unlock the fuel door.

Conditions for Running the DTC

* The hybrid powertrain control module 2 is awake
* The fuel tank is being filled.

Conditions for Setting the DTC

The hybrid powertrain control module 2 has detected that the fuel level in the fuel tank has increased but detects that the fuel filler door was always in the closed position.

Action Taken When the DTC Sets

The driver information center will display the Service Refuel System message.

Conditions for Clearing the DTC

DTC P04B6 is a type B DTC.

Reference Information
Schematic Reference

Release Systems Schematics (Release) Release Systems Schematics (Release)Release Systems Schematics (Liftgate) Release Systems Schematics (Liftgate)
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation

Fuel Fill Door Description and Operation Fuel Fill Door
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Verification

Observe the scan tool Fuel Door Position parameter while opening and closing the fuel filler door, the value should change between Open and Closed as the fuel filler door is opened and closed.

If the value is always Open or always Closed, refer to Fuel Filler Door Ajar Indicator Malfunction Fuel Filler Door Ajar Indicator Malfunction.