P0CE6
DTC P0CE6 or P0CE7
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 P0CE6
- Hybrid/EV Battery Pack Coolant Control Valve Position Sensor Circuit Low Voltage
DTC P0CE7
- Hybrid/EV Battery Pack Coolant Control Valve Position Sensor Circuit High Voltage
Circuit/System Description
The valve provides position feedback to the hybrid/EV powertrain control module 2 based on a potentiometer in the valve. The hybrid/EV powertrain control module 2 uses this feedback to monitor the valve position. Different valve positions correspond to different resistance values. The hybrid/EV powertrain control module 2 determines the resistance values corresponding to the end stop positions of the valve by moving the valve to an end-stop and back to its original position when the ignition is first turned on. This is referred to as the hybrid/EV powertrain control module 2 "diagnostic learn" the valve. This provides a valve shaft breakage test and allows the hybrid/EV powertrain control module 2 to "learn" the position feedback value that corresponds to that end-stop. The end-stop that is used at each Vehicle in Service Mode alternates between each end, the radiator end one time, the chiller end the next time, the radiator end the next time, etc.
Conditions for Running the DTC
The 12 V battery voltage is greater than 9 V.
Conditions for Setting the DTC
P0CE6
Feedback Voltage is less than 28% of the 5 V reference voltage.
P0CE7
Feedback Voltage is greater than 72% of the 5 V reference voltage.
Action Taken When the DTC Sets
* DTCs P0CE6 and P0CE7 are type B DTCs.
* The hybrid/EV powertrain control module 2 uses only the two extreme positions of the valve, radiator and 100% chiller
Conditions for Clearing the DTC
DTCs P0CE6 and P0CE7 are type B DTCs.
Diagnostic Aids
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
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 OFF, disconnect the harness connector at the Q65 hybrid/EV battery pack coolant control valve.
2. Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohm between the low reference circuit terminal 5 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests 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.
3. Vehicle in Service Mode, test for 4.8-5.2 V between the 5 V reference circuit terminal 6 and ground.
• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit is shorted to ground, refer to Testing the 5 V Reference Circuits for a Short to Ground. If the circuit tests 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 greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit is shorted to voltage, refer to Testing the 5 V Reference Circuits for a Short to Voltage. If the circuit tests 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.
4. Vehicle in Service Mode, test for 4.8-5.2 V between the signal circuit terminal 4 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/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 greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests 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.
5. If all circuits test normal, test or replace the Q65 hybrid/EV battery pack coolant control valve.
Testing the 5 V Reference Circuits for a Short to Ground
1. Vehicle OFF, disconnect the X1 harness connector at the K114B hybrid/EV powertrain control module 2.
2. Test for less than 100 ohm at the following terminals and ground;
* Terminal 62
* Terminal 63
* Terminal 64
• If greater than the specified range, replace the K114B hybrid/EV powertrain control module 2.
3. Repair the short to ground on the appropriate 5 V reference circuit. 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.
Testing the 5 V Reference Circuits for a Short to Voltage
1. Vehicle OFF, disconnect the X1 harness connector at the K114B hybrid/EV powertrain control module 2.
2. Vehicle in Service Mode, test for greater than 5.2 V at the following terminals and ground;
* Terminal 62
* Terminal 63
* Terminal 64
• If less than the specified range, replace the K114B hybrid/EV powertrain control module 2.
3. Repair the short to voltage on the appropriate 5 V reference circuit. 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.
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