P04C0
DTC P04BB, P04BC, or P04C0
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 Descriptors
DTC P04BB 00
- Fuel Fill Door Lock Control Circuit
DTC P04BC 00
- Fuel Fill Door Lock Performance
DTC P04C0 00
- Fuel Fill Door Unlock Performance
Diagnostic Fault Information
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
Hybrid Powertrain Control Module 2 is awake
Conditions for Setting the DTC
P04BB 00
The hybrid powertrain control module 2 has detected a short to ground, short to voltage or an open/high resistance on either of the lock actuator control circuits
P04BC 00
The hybrid powertrain control module 2 provided a lock command with no correspoding lock status indication on the fuel door lock actuator input circuit
P04C0 00
The hybrid powertrain control module 2 provided an unlock command with no correspoding unlock status indication on the fuel door lock actuator input circuit
Action Taken When the DTC Sets
* The fuel door latch will malfunction and the fuel filler door may not be able to be opened.
* The Wait to Refuel message always be displayed on the driver information center.
Conditions for Clearing the DTC
DTC P04BB 00, P04BC 00 and P04C0 00 are type B DTCs
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
Vehicle in Service Mode command the fuel door to LOCK and UNLOCK with a scan tool, the M97 fuel door lock actuator should perform the LOCK and UNLOCK functions.
Circuit/System Testing
1. Vehicle OFF, disconnect the harness connector at the M97 fuel door lock actuator.
2. Vehicle in Service Mode, verify that a test lamp illuminates between the control circuit terminal 1 and ground.
• If the test lamp is OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.
3. Verify that a test lamp illuminates between the control circuit terminal 2 and ground.
• If the test lamp is OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.
4. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2
5. Vehicle in Service Mode, command the fuel door to LOCK and UNLOCK with a scan tool. The test lamp should briefly illuminate while changing between the commanded states.
• If the test lamp is always OFF, test both control circuits for a short to voltage. If the circuits test normal, replace the K114B hybrid powertrain control module 2.
6. If all circuits test normal, test or replace the M97 fuel door lock actuator.
Component Testing
Fuel Door Lock Actuator
1. Vehicle OFF, disconnect the harness connector at the M97 fuel door lock actuator.
2. Install a 25 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M97 fuel door lock actuator should perform the LOCK and UNLOCK functions.
• If it does not perform as specified, replace the M97 fuel door lock actuator.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Fuel Tank Filler Door Lock Actuator Replacement Fuel Tank Filler Door Lock Actuator Replacement
* Control Module References Programming and Relearning for the hybrid powertrain control module 2 replacement, programming and setup