Volt

DTC P04B8-P04BA or P04DC

The hybrid powertrain control module 2 provides a 5V signal through a pull-up resistor to the Fuel Door Position Sensor Circuit. The other end of the Fuel Door Position Sensor Circuit is connected to the Fuel Door Position Sensor in the Fuel Door Status Switch Assembly. The hybrid powertrain control module 2 monitors the voltage on the Fuel Door Position Sensor Circuit. In normal operation, when the Fuel Door moves to the open position, the switch in the Fuel Door Lock Position closes and lowers the voltage on the Fuel Door Lock Position Sensor Circuit.

Hybrid Powertrain Control Module 2 is awake.

P04B8 00

The hybrid powertrain control module 2 detects the fuel door position signal circuit voltage is mid range between expected high and low voltage values

P04B9 00

The hybrid powertrain control module 2 detects a short to ground in the fuel door open signal circuit.

P04BA 00

The hybrid powertrain control module 2 detects a short to voltage or an open or high resistance in the fuel door open signal circuit.

The driver information centre will continuously display the Wait To Refuel message after the refuel request switch is pressed.

DTC P04B8 00, P04B9 00 and P04BA 00 are type B DTCs

Schematic Reference

Release Systems Schematics : Tailgate Schematics → Release System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel Fill Door Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode, transmission selector in Park, observe the scan tool Fuel Door Position parameter while opening and closing the fuel filler door, the value should change between Open and Closed.

1. Vehicle OFF, disconnect the harness connector at the B208 fuel door status switch assembly.
2. Test for less than 10 Ω between the ground circuit terminal 2 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Vehicle in Service Mode, test for 4.75 -- 5.25 V between the signal circuit terminal 1 and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

4. If all circuits test normal, test or replace the B208 fuel door status switch assembly.

1. Vehicle OFF, disconnect the harness connector at the B208 fuel door status switch assembly.
2. Test for 180 Ω--190 Ω between the signal terminal 1 and the ground terminal 2 with the switch in the open position.

⇒	If not within the specified range, replace the B208 fuel door status switch assembly.

3. Test for 2040 Ω--2065 Ω between the signal terminal 1 and the ground terminal 2 with the switch in the closed position.

⇒	If not within the specified range, replace the B208 fuel door status switch assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the hybrid powertrain control module 2 replacement, programming and setup