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P04BC




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 corresponding 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 corresponding 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 Systems Schematics

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

1. Vehicle in Service Mode.

2. Verify the function of the fuel door lock actuator when commanding the Fuel Fill Door to Lock and Unlock with a scan tool.

• If the Lock and Unlock function for the fuel door lock actuator does not work
Refer to Circuit/System Testing.

• If the Lock and Unlock function for the fuel door lock actuator works

3. All OK.

Circuit/System Testing

1. Vehicle OFF, disconnect the harness connector at the M97 fuel door lock actuator.

2. Test for greater than 10 V between the control circuit terminal 1 and ground.

• If 10 V or less

1. Vehicle OFF, disconnect the harness connector at the K114B hybrid powertrain control module 2.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance on the circuit.

• If less than 2 ohms, replace the K114B hybrid powertrain control module 2.

• If greater than 10 V

3. Test for greater than 10 V between the control circuit terminal 2 and ground.

• If 10 V or less

1. Vehicle OFF, disconnect the harness connector at the K114B hybrid powertrain control module 2.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance on the circuit.

• If less than 2 ohms, replace the K114B hybrid powertrain control module 2.

• If greater than 10 V

4. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2, Vehicle in Service Mode.

5. Verify the test lamp turns ON when commanding the Fuel Fill Door to Lock and Unlock with a scan tool.

• If the test lamp remains OFF during either of the commands

1. Vehicle OFF, disconnect the harness connector at the K114B hybrid powertrain control module 2. Vehicle in Service Mode

2. Test for less than 1 V between each control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V replace the K114B hybrid powertrain control module 2

• If the test lamp turns ON during each of the commands

6. 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 function.

• If the actuator does not perform the LOCK and UNLOCK function
Replace the M97 fuel door lock actuator.

• If the actuator performs the LOCK and UNLOCK function

3. All OK

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

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