Volt

DTC P0CE6 or P0CE7

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.

The 12 V battery voltage is greater than 9 V.

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.

DTCs P0CE6 and P0CE7 are type B DTCs.

After a valve replacement the Hybrid/EV Battery Pack Coolant Control Solenoid Valve Learn will need to be performed to prevent resetting DTCs.

Schematic Reference

Hybrid 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 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 2-5 second delay between the command and valve response.

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 Q65 hybrid/EV battery pack coolant control valve.
2. Ignition 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 Ω between the low-reference circuit terminal 5 and earth.

⇒

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 procedure.

3. Vehicle in Service Mode, test for 4.8-5.2 V between the 5 V reference circuit terminal 6 and earth.

⇒

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 short-circuited to earth, refer to Testing the 5 V Reference Circuits for a Short-circuit to Earth. 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 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-Circuit 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 procedure.

4. Vehicle in Service Mode, test for 4.8-5.2 V between the signal circuit terminal 4 and earth.

⇒

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 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 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-circuit to Earth

1. Ignition OFF, disconnect the X1 harness connector at the K114B hybrid/EV powertrain control module 2.
2. Test for less than 100 Ω at the following terminals and earth;

•	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-circuit to earth 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 procedure.

Testing the 5 V Reference Circuits for a Short-Circuit to Voltage

1. Ignition 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 earth;

•	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-circuit 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 procedure.

Perform the Diagnostic Repair Verification after completing the repair.