P0CE3
DTC P0CE0, P0CE2, P0CE3, P1EC7, or P1EC8
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 P0CE0
- Hybrid/EV Battery Pack Coolant Control Valve Performance
DTC P0CE2
- Hybrid/EV Battery Pack Coolant Control Valve Control Circuit 1 Low Voltage
DTC P0CE3
- Hybrid/EV Battery Pack Coolant Control Valve Control Circuit 1 High Voltage
DTC P1EC7
- Hybrid/EV Battery Pack Coolant Control Valve Control Circuit 2 Low Voltage
DTC P1EC8
- Hybrid/EV Battery Pack Coolant Control Valve Control Circuit 2 High Voltage
Circuit/System Description
The hybrid/EV battery pack coolant control valve drive circuit in the hybrid/EV powertrain control module 2 is two control circuit, terminal 1 (Drive A) and terminal 2 (Drive B), that can drive the valve motor in a forward or reverse direction. One end position of the range is the Radiator connection, the middle position is the bypass position and the other end is the chiller position.
Conditions for Running the DTC
P0CE0
* Vehicle in Service Mode and the Propulsion System transitions to Active.
* The 12 V battery voltage is greater than or equal to 10 V.
* The battery minimum temperature and battery inlet temperature are above -26°C (-14.8°F)
* None of the following DTCs are set: P0CE2, P0CE3, P0CE6, P0CE7, P1EC7, P1EC8
OR
* Hybrid/EV powertrain control module 2 is awake
* The 12 V battery voltage is greater than or equal to 10 V.
* The battery minimum temperature and battery inlet temperature are above -26°C (-14.8°F)
* None of the following DTCs are set: P0CE2, P0CE3, P0CE6, P0CE7, P1EC7, P1EC8
P0CE2, P1EC7, P0CE3, and P1EC8
* The hybrid/EV powertrain control module 2 is awake and communicating.
* The 12 V battery voltage is greater than or equal to 10 V.
* Hybrid/EV Battery Pack Coolant Control Valve is being commanded to move.
Conditions for Setting the DTC
P0CE0
* The control circuit terminal 1 (Drive A) or control circuit terminal 2 (Drive B) is open.
OR
* If during any learn procedure the valve does not reach the end-stops of approximately 42% and 50% in 30 seconds or goes past the end-stops of approximately 30% and 70% or the difference between the two end-stops is less than 15% or greater than 33%.
OR
* Hybrid/EV Battery Pack Coolant Control Valve has not reached its commanded position within 30 seconds.
OR
* Hybrid/EV Battery Pack Coolant Control Valve feedback position is not within 3% of valve commanded position.
OR
* Hybrid/EV Battery Pack Coolant Control Valve feedback position signal is erratic and its noise level sum is greater than 12% over 4 seconds.
P0CE2
The hybrid/EV powertrain control module 2 detects control circuit terminal 1 (Drive A) is grounded during a period when the hybrid/EV powertrain control module 2 is commanding 12 V on the control circuit terminal 1 (Drive A). This occurs when the valve is commanded towards the 100% chiller position.
P0CE3
The hybrid/EV powertrain control module 2 detects control circuit terminal 1 (Drive A) has 12 V during a period when the hybrid/EV powertrain control module 2 is commanding 0 volts on the control circuit terminal 1 (Drive A). This occurs when the valve is commanded towards the radiator position.
P1EC7
The hybrid/EV powertrain control module 2 detects control circuit terminal 2 (Drive B) is grounded during a period when the hybrid/EV powertrain control module 2 is commanding 12 V on the control circuit terminal 2 (Drive B). This occurs when the valve is commanded towards the radiator position.
P1EC8
The hybrid/EV powertrain control module 2 detects control circuit terminal 2 (Drive B) has 12 V during a period when the hybrid/EV powertrain control module 2 is commanding 0 volts on the control circuit terminal 2 (Drive B). This occurs when the valve is commanded towards the 100% chiller position.
Action Taken When the DTC Sets
DTCs P0CE0, P0CE2, P0CE3, P1EC7, and P1EC8 are type B DTCs
Conditions for Clearing the DTC
* DTCs P0CE0, P0CE2, P0CE3, P1EC7, and P1EC8 are type B DTCs
* The Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn will need to be performed.
Diagnostic Aids
* Verify that the wire harness connector does not have corrosion when diagnosing a DTC P0CE0, P0CE2, P1EC7, P0CE3, or P1EC8.
* After a valve replacement the Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn will need to be performed to prevent resetting DTCs.
Reference Information
Schematic Reference
Hybrid Cooling Schematics Hybrid 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 Hybrid/EV Battery Pack Coolant Control Solenoid Valve Command between 10%-90%. Verify that the Hybrid/EV Battery Pack Coolant Control Solenoid Valve Feedback matches the command. There may be a 30 second delay between the command and valve response.
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 (1-877-446-8227) if you have any questions.
1. Vehicle in Service Mode, verify that DTC P0CE6 or P0CE7 are not set.
• If DTC P0CE6 or P0CE7 is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Verify that DTC P0CE0 is not set.
• If DTC P0CE0 is set, with a scan tool, perform the Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn procedure.
3. Vehicle OFF, and all vehicle systems OFF, it may take up to 2 minutes for all vehicle systems to power down, operate the vehicle within the conditions for running the DTC.
4. Verify that the DTC does not reset.
5. Vehicle OFF, disconnect the harness connector at the Q65 hybrid/EV battery pack coolant control valve.
6. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2.
7. Vehicle in Service Mode, command the Hybrid/EV Battery Pack Coolant Control Solenoid Valve between Normal and Bypass and observe the test lamp. Verify that the test lamp illuminates momentarily between each command.
• If the test lamp does not illuminate, test both control circuits for an open/high resistance on either control circuit. If the circuits test normal, replace the K114B hybrid/EV powertrain control module 2. After the repair, with a scan tool, perform the Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn procedure.
• If the test lamp illuminates only on one command, test both control circuits for a short to voltage or short to ground on either control circuit. If the circuits test normal, replace the K114B hybrid/EV powertrain control module 2. After the repair, with a scan tool, perform the Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn procedure.
8. If all circuits test normal, test or replace the Q65 hybrid/EV battery pack coolant control valve.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Drive Motor Battery Coolant Flow Control Valve Replacement Drive Motor Battery Coolant Flow Control Valve Replacement
* Control Module References Programming and Relearning for hybrid/EV powertrain control module 2 replacement, programming and setup