Volt

DTC P0480 or P0483

The hybrid/EV powertrain control module 2 controls the radiator cooling fans. The cooling fans are controlled with a pulse width modulated (PWM) signal. The hybrid/EV powertrain control module 2 diagnoses any faults with the hardwire circuit to the engine control module. The engine control module sends a fan request PWM signal to the hybrid/EV powertrain control module 2 through a hardwire circuit. The hybrid/EV powertrain control module 2 operates in a pass-through mode for the engine control module fan request. The higher the duty cycle the higher the cooling fan speed.

The 12 V battery voltage is greater than or equal to 9 V.

The hybrid/EV powertrain control module 2 has detected an open-circuit, short-circuit to earth or short-circuit to voltage fault on the fan control circuit.

DTC P0480 and P0483 are type B DTCs.

DTC P0480 and P0483 are type B DTCs.

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Hybrid Cooling System Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode, with a scan tool, command the Cooling Fan Motor Command to 90%. Verify that the cooling fan motor speed is greater than 0 RPM and the cooling fans are operating.

Danger: Any hybrid/EV battery pack replacement shall be performed by High-Voltage Qualified Technicians only. The replacement procedure can be found in the service instruction and must be strictly followed at all times. The High-Voltage Qualified Technician is responsible for adherence to the manufacturer's service instructions as well as current national legal regulations. If the hybrid/EV battery pack needs to be replaced contact the Technical Assistance Centre for further instructions prior to removal of the battery pack.

1. Ignition OFF, disconnect the harness connector at the appropriate G10 cooling fan motor.
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, verify that a test lamp illuminates between the B+ circuit terminal 1 and earth.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test or replace G10 cooling fan motor.

4. Connect a test lamp between the control circuit terminal4 and the B+ circuit terminal 1.
5. Command the Cooling Fan Motor Command ON between 10% and 90% with a scan tool. Verify the test lamp changes between dim (10%) and bright (90%).

⇒	If the test lamp is always bright, test the control circuit for a short-circuit to earth. If the circuit tests normal, replace the K114B hybrid/EV powertrain control module 2.

⇒	If the test lamp is always dim or OFF, test the control circuit for a short-circuit to voltage or an open-circuit/high resistance. If the circuit tests normal, replace the K114B hybrid/EV powertrain control module 2.

6. If all circuits test normal, replace the appropriate G10 cooling fan motor.

Perform the Diagnostic Repair Verification after completing the repair.