P0480
DTC P0480 or P0483
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 P0480
- Cooling Fan 1 Control Circuit
DTC P0483
- Cooling Fan System Performance
Circuit/System Description
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 hybrid/EV powertrain control module 2 sends a request to the engine control module for the cooling fans to be turned on. The engine control module uses this request and other vehicle inputs to decide if and what speed the cooling fans should operate. The engine control module sends the cooling fan command to the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 sends the signal to the cooling fans to operate and at what speed.
If the vehicle is in Charge Mode and the hybrid/EV powertrain control module 2 requests the cooling fans to operate, if the engine control module is not awake, the hybrid/EV powertrain control module 2 will control the cooling fans. If active cooling is needed, the engine control module wakes up to operate the air conditioning control module and then the engine control module is the master controller for the fans
Conditions for Running the DTC
The 12 V battery voltage is greater than or equal to 9 V.
Conditions for Setting the DTC
The hybrid/EV powertrain control module 2 has detected an open, short to ground or short to voltage fault on the fan control circuit.
Action Taken When the DTC Sets
DTC P0480 and P0483 are type B DTCs.
Conditions for Clearing the DTC
DTC P0480 and P0483 are type B DTCs.
Reference Information
Schematic Reference
Engine Cooling Schematics Engine Cooling Schematics
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation
Hybrid Cooling System Description and Operation Hybrid Cooling System Description and Operation
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
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
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.
Circuit/System Testing
Danger: The Volt Battery Pack will utilize an exchange program. Please consult the most recent revision of bulletin/PI #PIP4841, available in Service Information (SI), for a list of approved Volt Battery Pack service procedures. Components that may be removed and serviced without exchanging the complete battery pack are identified in the bulletin/PI. Please contact the GM Technical Assistance Center if you have any questions.
1. Vehicle OFF, disconnect the harness connector at the appropriate G10 cooling fan motor.
2. Test for less than 10 ohms 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 ground.
• 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 terminal 4 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 to ground. 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 to voltage or an open/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.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Cooling Fan and Shroud Replacement Service and Repair- G10 cooling fan motor
* Control Module References Programming and Relearning for hybrid/EV powertrain control module 2 replacement, programming and setup