Hybrid/ev Battery Heating and Cooling System Cadillac ELR I

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Vehicle in Service Mode.
Verify that the cooling fan motor speed is greater than 0 RPM and both the cooling fans are operating when command the Cooling Fan Motor Command to 90% with a scan tool. If either or both cooling fans are not operating Refer to Circuit/System Testing. If the cooling fans are operating
All OK.

Circuit/System Testing

Vehicle OFF, disconnect the harness connector at the appropriate G10 Cooling Fan Motor.
Test for less than 10 ohms between the ground circuit terminal 2 and ground. If 10 ohms or greater Test the ground circuit for an open/high resistance. If less than 10 ohms
Connect a test lamp between the B+ circuit terminal 1 and ground.
Verify a test lamp illuminates between the B+ circuit terminal 1 and ground. If the test lamp does not illuminate and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the G10 Cooling Fan Motor. If the test lamp illuminates
Connect a test lamp between the control circuit terminal 4 and the B+ circuit terminal 1.
Verify the test lamp changes between dim (10%) and bright (90%) when command the Cooling Fan Motor Command ON between 10% and 90% with a scan tool. If the test lamp is always dim or does not illuminate Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Vehicle OFF. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp is always bright Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. The test lamp changes illumination between bright (20 %) and dim (90 %)
Replace the G10 cooling fan motor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

«Cooling Fan and Shroud Replacement»(/cadillac/elr/i-2013-2015/remont/cooling-system-mechanical/#engine-cooling-system)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV battery pack has 9 hybrid/EV battery temperature sensors. The temperature sensor is a variable resistor that measures the temperature of the hybrid/EV battery cell groups. The hybrid/EV battery interface control module supplies 5 V to the signal circuit and a ground for the low reference circuit. The hybrid/EV battery temperature sensor resistance changes with battery temperature. The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the lower the resistance of the sensor. The hybrid/EV powertrain control module 2 uses the battery temperature sensors to determine the hybrid/EV battery module temperature to control the battery cooling system operation.

The hybrid/EV powertrain control module 2 and hybrid/EV battery energy control module are awake and communicating.
None of the following DTCs are set: P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, P0C7D, P0C7E, P0C7F, P0C82, P0C83, P0C84, P0C89, P0C8A, P0C8B, P1E8E, P1E8F, P1E90, P1E91, P1E93, P1E94, P1E95, P1E96, P1E97, P1E99, P1E9A, P1E9B, P1E9C, P1E9D, P1E9F, P1EA0, P1EA1, P1EA2, P1EA3, P1EA5, P1EB1, P1EB2, P1EB3, P1EB4, P1EB5, U2401, U2603, U2604, U2605, U2606.

The maximum sensed temperature in the hybrid/EV battery is greater than 73.5°C (164.3°F).

DTC P0A7E is a type A DTC.
All of the battery contactors will open.

DTC P0A7E is a type A DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit
EL-48571-25 High Voltage Battery Pin Out Box

For equivalent regional tools, refer to Special Tools .

Vehicle in Service Mode.
Verify that DTC P0A9C-P0A9E, P0AC6-P0ACD, P0AE9-P0AEB, P0BC3-P0BC5, P0C34-P0C36, P0C7D-P0C8B, P0C43-P0C45, P0C47, P0C4A, P0CD6, P0CD7, P0CD8, P0CE0-P0CE3, P0CE6, P0CE7, P0CE9, P0CED, P148A-P148C, P1EC6-P1EC8, or P1E8C is not set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
Observe the scan tool hybrid/EV powertrain control module 2 Maximum Hybrid Battery Module Temperature. The sensor reading should be between -39 and +60°C (-38.2 and +140°F). If not within the specified range Refer to Circuit/System Testing. If within the specified range
All OK.

WARNING

Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors. Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors. Visually and functionally inspect the gloves before use. Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures may result in serious injury or death.

Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
Remove the A4 Hybrid/EV Battery Pack cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
Disconnect the harness connector at the appropriate K112 Hybrid/EV Battery Interface Control Module harness connector. Connect the EL-48571-25 High Voltage Battery Pin Out Box. Insert the DMM probes into the EL-48571-25 test cavities.
Test for 14-20k ohms at 21.11°C (70°F) between each of the signal circuit and low reference circuit terminals at each orange harness connector for all of the K112 Hybrid/EV Battery Interface Control Modules. Refer to «EL-48571 High Voltage Battery Pin Out Box Reference»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__el-48571-high-voltage-battery-pin-out) . The resistance of each temperature sensor should be within the specified range, and within 1k ohms of each other. If not within the specified range Test for less than 1 V between the low reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for infinite resistance between the low reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the appropriate C4 Hybrid/EV Battery Section. If within the specified range
Replace the appropriate K112 Hybrid/EV Battery Interface Control Module and C4 Hybrid/EV Battery Section.

Perform the Diagnostic Repair Verification after completing the repair.

«Auxiliary Battery Wiring Harness Replacement (Module Harness 2)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Auxiliary Battery Wiring Harness Replacement (Module Harness 3)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Auxiliary Battery Wiring Harness Replacement (Module Harness 4)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Auxiliary Battery Wiring Harness Replacement (Module Harness 1)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
«Cell Battery Replacement (Section 3)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-3) , «Cell Battery Replacement (Section 1)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-1) , «Cell Battery Replacement (Section 2)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-2)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV battery interface control module replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

P0A9D, P0A9E, P0AC7, P0AC8, P0ACC, P0ACD, P0AEA, P0AEB, P0BC4, P0BC5, P0C35, P0C36, P0C7E, P0C7F, P0C83, P0C84, P0C8A, and P0C8B

The 12 V battery voltage is greater than 9 V.
Hybrid/EV powertrain control module 2 and hybrid/EV battery energy control module are awake and communicating
None of the following DTCs are set: P1E93, P1E99, P1E9F, P1EA5, P1E8E, P1E94, P1E9A, or P1EA0
2nd Protection Self test is not running

P0A9C, P0AC6, P0ACB, P0AE9, P0BC3, P0C34, P0C7D, P0C82, and P0C89

None of the following DTCs are set: P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, P0C7D, P0C7E, P0C7F, P0C82, P0C83, P0C84, P0C89, P0C8A, P0C8B, P1E8E, P1E8F, P1E90, P1E91, P1E93, P1E94, P1E95, P1E96, P1E97, P1E99, P1E9A, P1E9B, P1E9C, P1E9D, P1E9F, P1EA0, P1EA1, P1EA2, P1EA3, P1EA5, P1EB1, P1EB2, P1EB3, P1EB4, P1EB5, U2401, U2603, U2604, U2605, U2606

P0A9C, P0AC6, P0ACB, P0AE9, P0BC3, P0C34, P0C7D, and P0C82

The difference between a hybrid/EV battery temperature sensor and the average of the other hybrid/EV battery temperature sensors is greater than a 10° C (18° F).

P0A9D, P0AC7, P0ACC, P0AEA, P0BC4, P0C35, P0C7E, P0C83, and P0C8A

The hybrid/EV battery temperature sensor is greater than 87.5° C (189.5° F).

P0A9E, P0AC8, P0ACD, P0AEB, P0BC5, P0C36, P0C7F, P0C84, and P0C8B

The hybrid/EV battery temperature sensor is -40° C (-40° F).

DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, P0C7D, P0C7E, P0C7F, P0C82, P0C83, P0C84, P0C89, P0C8A, and P0C8B are type B DTCs.
If eight sensors fail, the vehicle will operate in a reduced power mode and electric only engine ON (EV) (engine will be running continuously).

DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, P0C7D, P0C7E, P0C7F, P0C82, P0C83, P0C84, P0C89, P0C8A, and P0C8B are type B DTCs.

Diagnostic Aids

Low or no coolant in the system may set a DTC P0A9D, P0AC7, P0ACC, P0AEA, P0BC4, P0C35, P0C7E, P0C83, or P0C8A.
If DTC P0C8E, P0C8F, P0C90, P0C93, P0C94, P0C95, P0C98, P0C99, P0C9A, P0CA9, P0CAA, P0CAB, P0CAE, P0CAF, P0CB0, P0CB3, P0CB4, P0CB5, P0CB8, P0CB9, or P0CBA is set, refer to Bulletin #11137.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit
EL-48571-25 High Voltage Battery Pin Out Box

For equivalent regional tools, refer to Special Tools .

Vehicle in Service Mode.
Verify that DTC P0C47, P0CE2, P0CE3, P1E8C, P1EC6 P1EC7, or P1EC8 is not set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
Observe the scan tool Hybrid Battery 1-9 temperature parameters. The sensor readings should be between -39 and +87° C (-38.2 and + 188.6° F) with no greater than a 15° C (27° F) difference between any of the temperature sensor readings. Refer to «Temperature Versus Resistance»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__temperature-versus-resistance) If not within the specified range Refer to Circuit/System Testing. If within the specified range
All OK.

WARNING

Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
Remove the A4 Hybrid/EV Battery Pack cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
Disconnect the harness connector at the appropriate K112 Hybrid/EV Battery Interface Control Module harness connector. Connect the EL-48571-25 High Voltage Battery Pin Out Box. Insert the DMM probes into the EL-48571 test cavities.
Test for 14-20k ohms at 21.11°C (70°F) between each of the signal circuit and low reference circuit terminals at each orange harness connector for all of the K112 Hybrid/EV Battery Interface Control Modules. Refer to «EL-48571 High Voltage Battery Pin Out Box Reference»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__el-48571-high-voltage-battery-pin-out) . The resistance of each temperature sensor should be within the specified range, and within 1k ohms of each other. If not within the specified range Test for less than 1 V between the low reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for infinite resistance between the low reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the appropriate C4 Hybrid/EV Battery Section. If within the specified range
Replace the appropriate K112 Hybrid/EV Battery Interface Control Module and C4 Hybrid/EV Battery Section.

Perform the Diagnostic Repair Verification after completing the repair.

«Auxiliary Battery Wiring Harness Replacement (Module Harness 2)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Auxiliary Battery Wiring Harness Replacement (Module Harness 3)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Auxiliary Battery Wiring Harness Replacement (Module Harness 4)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Auxiliary Battery Wiring Harness Replacement (Module Harness 1)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
«Cell Battery Replacement (Section 3)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-3) , «Cell Battery Replacement (Section 1)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-1) , «Cell Battery Replacement (Section 2)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-2)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV battery interface control module replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV powertrain control module 2 will monitor the battery temperature and set a DTC if the battery temperature can not be properly maintained.

The 12 V system voltage is greater than 9 V.
The vehicle is in propulsion system active mode. OR
The vehicle is plugged into an AC source.
DTC P1EC6 heater performance diagnostic, DTC P0C4A pump performance diagnostic and DTC P0534 R134A low-charge detection have completed
The following DTCs are not set; P0534, P0C47, P0C4A, P0CE0, P0CE2, P0CE3, P1EC6, P1EC7, P1EC8, P1F18

The vehicle is in Active Cooling mode.
The Battery Average Temperature continuously exceeds 45°C (113°F) for 5 minutes. OR
The vehicle is in Active Heating mode.
The Battery Average Temperature is continuously below -25°C (-13°F) for 50 minutes.

DTC P0C32 is a type A DTC.

The hybrid/EV battery pack coolant pump may be faulty.
The hybrid/EV battery pack coolant control valve may be leaking internally.
The hybrid/EV battery pack heater may be defective.
The hybrid/EV battery coolant level may be low or there may be no coolant.
The AC refrigerant level may be low or the AC chiller may be inoperative.
The hybrid/EV battery coolant lines may be restricted or blocked.

Schematic Reference

«Hybrid/EV Cooling Schematics»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
«HVAC Schematics»(/cadillac/elr/i-2013-2015/remont/automatic-hvac-system/#hvac-system-automatic)

Connector End View Reference

Drive Motor Battery System Description

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode, verify that DTCs P0C47, P0C4A, P0CE0, P0CE2, P0CE3, P0CE6, P0CE7, P148A, P148B, P148C, P1E8C, P1E8D, P1EBE, P1EBF, P1EC3, P1EC4, P1EC5, P1EC6, P1EC7, P1EC8, or P1F18 is not set. If any of the DTCs is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
Vehicle in Service Mode. The hybrid/EV battery pack coolant pump will be disabled and not running.
Verify the scan tool parameters listed below: Hybrid/EV Battery Pack Coolant Pump Command is less than 10 %. Hybrid/EV Battery Pack Coolant Pump Feedback is 0 %. Hybrid/EV Battery Pack Coolant Pump Speed is 25 RPM. The scan tool parameters listed are not at the specified values Refer to «Hybrid/EV Battery Pack Coolant Pump Malfunction»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system) The scan tool parameters listed are at the specified values
Vehicle OFF, connect the charge cord set. With the vehicle in Charge Mode, the hybrid/EV battery pack coolant pump will be enabled and not running.
Verify the scan tool parameters listed below: Hybrid/EV Battery Pack Coolant Pump Command is 10%. Hybrid/EV Battery Pack Coolant Pump Feedback to be 50% +/-5%. Hybrid/EV Battery Pack Coolant Pump Speed is 50 RPM. The scan tool parameters listed are not at the specified values Refer to «Hybrid/EV Battery Pack Coolant Pump Malfunction»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system) The scan tool parameters listed are at the specified values
Observe the scan tool Battery Average Temperature parameter. The reading should be between -25°C ( -13°F) and 45° C (113° F). If the parameter is -25°C ( -13°F) or less Refer to «Hybrid/EV Battery Cooling Diagnostic»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-cooling-diagnostic) If the parameter is 45°C (113°F) or greater Refer to «Hybrid/EV Battery Cooling Diagnostic»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-cooling-diagnostic) If the reading is within the specified range
All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV battery has 2 hybrid/EV battery pack coolant temperature sensors. The hybrid/EV battery pack coolant temperature sensors are located in the coolant inlet (sensor 1) and the outlet (sensor 2) of the hybrid/EV battery. The temperature sensor is a variable resistor that measures the temperature of the hybrid/EV battery coolant. The hybrid/EV battery pack coolant temperature sensor resistance changes with battery coolant temperature. The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the lower the resistance of the sensor. The battery energy control module uses the hybrid/EV battery temperature sensors to determine the hybrid/EV battery pack temperature to control the battery cooling and heating operations.

P0C43

The vehicle is in service mode.
The 12 V battery voltage is greater than or equal 9 V.
None of the following DTCs are set: P0C44, P0C45, P0C47, P0C4A, P0CD7, P0CD8, P1F18, or U0111.
The coolant pump speed is greater than 20% .

P0C44

The 12 V battery voltage is greater than 9 V.
Battery energy control module is awake and communicating
DTC P1A07 is not set.

P0C45

The 12 V battery voltage is greater than 9 V.
Battery energy control module is awake and communicating
DTC P1A07 is not set.

P0C43

The hybrid/EV battery pack coolant temperature sensor 1 reading is not within 28°C (50.4°F) of the hybrid/EV battery pack coolant temperature sensor 2 and is not within 28° C (50.4° F) of the Average Hybrid Battery Pack Temperature .

P0C44

The hybrid/EV battery pack coolant temperature sensor 1 is greater than 87.5°C (189.5°F).

P0C45

The hybrid/EV battery pack coolant temperature sensor 1 is less than or equal to -40°C (-40°F).

DTC P0C43-P0C45 are type B DTCs.
The active heating mode is disabled.

DTC P0C43-P0C45 are type B DTCs.

Low or no coolant in the system may set a DTC P0C43.
DTC P0C43-P0C45 will prevent battery heating and the vehicle will be unable to start in cold weather with battery temperatures below -25°C (-13°F).

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

Vehicle in Service Mode.
Verify that DTC P0AC1, P0B10, P0C44, P0C47, P0C4A or P1F18 is not set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
Verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 1 parameter is between -39 and +85°C (-38.2 and +185°F). If not within the specified range Refer to Circuit/System Testing. If within the specified range
Verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 1 and Hybrid/EV Battery Pack Coolant Temperature Sensor 2 parameters are within 28°C (50.4°F) of each other. If not within the specified range Refer to Circuit/System Testing. If within the specified range
All OK.

WARNING

Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , . Remove the A4 Hybrid/EV Battery Pack cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) . Disconnect the harness connector at the B204A Hybrid/EV Battery Pack Coolant Temperature Sensor 1.
Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 Battery Energy Control Module. If less than 10 ohms
Connect the EL-50211 Low Voltage Jumper Harness Extension. Connect the 12 V battery. Vehicle in Service Mode.
Verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 1 is less than -35° C (-38.2° F). If greater than -35° C (-38.2° F) Vehicle OFF, test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module. If less than -35° C (-38.2° F)
Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
Verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 1 is greater than 80° C (176° F). If less than 80° C (176° F) Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Vehicle OFF, test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 Battery Energy Control Module. If 80° C (176° F) or greater
Replace the B204A Hybrid/EV Battery Pack Coolant Temperature Sensor 1.

Perform the Diagnostic Repair Verification after completing the repair.

«Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV battery pack coolant pump circulates coolant through the drive motor battery coolant radiator, drive motor battery coolant cooler, and the hybrid/EV battery pack to control the temperature of the hybrid/EV battery pack. An enable signal from the hybrid/EV powertrain control module 2 to the hybrid/EV battery pack coolant pump provides overall control of the pump. When this circuit is high, the pump can operate. The pump is controlled with a pulse-width modulated signal from the hybrid/EV powertrain control module 2 to the hybrid/EV battery pack coolant pump. The higher the duty cycle the higher the pump speed. The hybrid/EV battery pack coolant pump provides a hard-wired pulse-width modulated feedback signal to the hybrid/EV powertrain control module 2. During normal operation, this feedback signal provides pump speed information to the hybrid/EV powertrain control module 2. The hybrid/EV battery pack coolant pump has some self-diagnostic capability. If the hybrid/EV battery pack coolant pump determines there is an internal fault it provides this information on this same feedback circuit instead of pump speed information.

P0C47

The 12 V battery voltage is greater than or equal to 9 V.
The coolant pump enable is commanded.

P0C4A

The 12 V battery voltage is greater than or equal to 9 V.
The hybrid/EV powertrain control module 2 is awake and communicating with the hybrid/EV battery energy control module.
Runs once per ignition cycle when the propulsion system goes active.
The heater performance diagnostic has passed.
None of the following DTCs are set: P0C44, P0C45, P0C47, P1EC6, P1F18, U0111, U18B, or U2602.

P1E8C

The 12 V battery voltage is greater than or equal to 10.2 V.
The coolant pump enable is commanded.

P1E8D

The 12 V battery voltage is greater than or equal to 10.2 V.
The coolant pump is OFF

P1F18

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

P0C47

The hybrid/EV powertrain control module 2 detects the Coolant Pump Control circuit is open, shorted to voltage or shorted to ground.

P0C4A

The hybrid/EV powertrain control module 2 did not see the battery inlet temperature fall fast enough during the 18 second test period. The hybrid/EV powertrain control module 2 did not detect a decrease of 2° C (3.6° F) in 4 seconds within the 18 second test period.

P1E8C

The hybrid/EV powertrain control module 2 detects the Coolant Pump Control circuit is open or shorted to voltage.

P1E8D

The hybrid/EV powertrain control module 2 detects the Coolant Pump Control circuit is open or shorted to ground.

P1F18

The hybrid/EV powertrain control module 2 detects the Coolant Pump Enable circuit is open, shorted to voltage or shorted to ground.

DTCs P0C47, P0C4A, P1E8C, P1E8D, and P1F18 are type B DTCs.

Low or no coolant in the system may set a DTC P0C4A.
P1EC5 may cause a DTC P0C4A
P1F18 may cause a DTC P0C47

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode.
Verify that DTC P0C43, P0C44, P0C45, P0CE0, P0CE2, P0CE3, P0D0A, P0D11, P1EBC, P1EC3, P1EC4, P1EC5, P1EC6, P1EC7, P1EC8, P1FFB, P1FFC, P1FFD, P1FFE, U0111, U185B, or U2602 is not set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
Verify the hybrid/EV battery pack coolant pump parameters listed below when commanding the hybrid/EV battery pack coolant pump between 20% and 90 % with a scan tool. Hybrid/EV Battery Pack Coolant Pump Command to be 10% or greater. Hybrid/EV Battery Pack Coolant Pump Feedback to be 50% +/-5%. Hybrid/EV Battery Pack Coolant Pump Speed is greater than 500 RPM. The scan tool parameters listed are not the specified ranges Refer to Circuit/System Testing. The scan tool parameters listed are within the specified ranges
All OK.

Vehicle OFF, disconnect the harness connector at the G37 Hybrid/EV Battery Pack Coolant Pump.
Test for less than 5 ohms between the ground circuit terminal 4 and ground. If 5 ohms or greater Repair the open/high resistance on the ground circuit. If less than 5 ohms
Vehicle in Service Mode.
Test for B+ between the B+ circuit terminal 5 and the ground circuit terminal 4. If less than B+ Vehicle OFF, test for infinite resistance between the B+ circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms and the fuse is blown, replace the G37 Hybrid/EV Battery Pack Coolant Pump. If B+
Connect a test lamp between the enable circuit terminal 1 and the ground circuit terminal 4.
Verify the test lamp turns ON and OFF when commanding the Hybrid Battery Pack Coolant Pump OFF (10 %) and ON (90 %) with a scan tool. If the test lamp is always illuminated at 10 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 1 V between the pump enable circuit terminal and ground. If 1 V or greater, repair the short to ground on the circuit. If less than 1 V, replace the K114B hybrid/EV powertrain control module 2. If the test lamp does not illuminate at 90 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the pump enable circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the pump enable circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp turns ON and OFF
Connect a test lamp between the control circuit terminal 3 and the B+ circuit terminal 5.
Verify that a test lamp changes illumination between bright (20 %) and dim (90 %) when command the Hybrid Battery Pack Coolant Pump ON between 20 % and 90 % with a scan tool. If the test lamp is always dim or does not illuminate Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp is always bright Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. The test lamp changes illumination between bright (20 %) and dim (90 %)
Remove the test lamp.
Verify the scan tool Hybrid Battery Pack Coolant Pump Feedback parameter is less than 10 %. If greater than 10 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the feedback circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. If 10 % or less
Install a 3 A fused jumper wire between the feedback circuit terminal 2 and the ground circuit terminal 4.
Verify the scan tool Hybrid Battery Pack Coolant Pump Feedback parameter is greater than 90 %. If 90 % or less Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 1 V between the feedback circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If greater than 90 %
Replace the G37 Hybrid/EV Battery Pack Coolant Pump.

Perform the Diagnostic Repair Verification after completing the repair.

«Drive Motor Battery Coolant Pump Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

P0CD6

The hybrid/EV powertrain control module 2 is awake and communicating.
The 12 V battery voltage is greater than or equal to 9 V.
None of the following DTCs are set: P0C47, P0C4A, P0CD7, P0CD8, U185B, or U2602.
The coolant pump speed is greater than 20%.

P0CD7

The 12 V battery voltage is greater than or equal to 9 V.
The battery energy control module is awake and communicating.
DTC P1A07 is not set.

P0CD8

The 12 V battery voltage is greater than or equal to 9 V.
The battery energy control module is awake and communicating.
DTC P1A07 is not set.

P0CD6

The hybrid/EV battery pack coolant temperature sensor 2 is not within 20°C (36°F) of the hybrid/EV battery pack coolant temperature sensor 1 and the Average Hybrid/EV Battery Pack Temperature.

P0CD7

The coolant temperature 2 is greater than or equal to 87.5°C (189.5°F).

P0CD8

The coolant temperature 2 is less than or equal to -40°C (-40°F).

DTC P0CD6-P0CD8 are type B DTCs.

Low or no coolant in the system may set a DTC P0CD6.
The hybrid/EV powertrain control module 2 will use battery pack cell temperatures as a default.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

Vehicle in Service Mode.
Verify that DTC P0AC1, P0B10, P0C44, P0C47, P0C4A or P1F18 is not set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
Verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 2 parameter is between -39 and +85°C (-38.2 and +185°F). If not within the specified range Refer to Circuit/System Testing. If within the specified range
Verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 2 and Hybrid/EV Battery Pack Coolant Temperature Sensor 1 parameters are within 28°C (50.4°F) of each other. If not within the specified range Refer to Circuit/System Testing. If within the specified range
All OK.

WARNING

Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , . Remove the A4 Hybrid/EV Battery Pack cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) . Disconnect the harness connector at the B204B Hybrid/EV Battery Pack Coolant Temperature Sensor 2.
Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If greater than the specified range Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 Battery Energy Control Module. If within the specified range
Connect the EL-50211 low voltage jumper harness extension. Connect the 12 V battery. Vehicle in Service Mode.
Verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 2 is less than -35° C (-38.2° F). If greater than the specified range Vehicle OFF, test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module. If within the specified range
Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
Verify the scan tool Hybrid Battery Pack Coolant Temperature Sensor 2 is greater than 80° C (176° F). If less than the specified range Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Vehicle OFF, test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 Battery Energy Control Module. If greater than the specified range
Replace the B204B Hybrid/EV Battery Pack Coolant Temperature Sensor 2.

Perform the Diagnostic Repair Verification after completing the repair.

«Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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.

P0CE5 and P1F56

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, P0CE3, P1EC7,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.

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.

P0CE5

Hybrid/EV Battery Pack Coolant Control Valve has not reached its commanded position within 30 seconds.

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.

P1F56

The control circuit terminal 1 (Drive A) or control circuit terminal 2 (Drive B) is open.
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%.

DTCs P0CE2, P0CE3, P0CE5, P1EC7, and P1EC8 are type B DTCs
DTC P1F56 is a type A DTC

DTCs P0CE2, P0CE3, P0CE5, P1EC7, P1EC8 and P1F58 are type B DTCs
DTC P1F56 is a type A DTC
The «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) will need to be performed.

Verify that the wire harness connector does not have corrosion when diagnosing a DTC P0CE2, P0CE3, P0CE5, P1EC7, P1EC8, or P1F56.
After a valve replacement the «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) will need to be performed to prevent resetting DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode.
Verify that DTC P0CE6 or P0CE7 are not set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
Verify that DTC P0CE5, P1F56, or P1F58 is not set. If any of the DTCs are set Perform the «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) procedure with a scan tool. If none of the DTC are set
Verify that the DTC P0CE2, P0CE3, P0CE5, P1EC7, P1EC8, or P1F56 does not set while operating the vehicle under the Conditions for Running the DTC. You may also operate the vehicle under the conditions that you observed from the Freeze Frame/Failure Records data. If any of the DTCs are set Refer to Circuit/System Testing If none of the DTC are set
Verify the Hybrid/EV Battery Pack Coolant Control Solenoid Valve Feedback matches the command when commanding the Hybrid/EV Battery Pack Coolant Control Solenoid between 10%-90% with a scan tool. If the feedback does not match the command Refer to Circuit/System Testing. If the feedback matches the command
All OK.

Vehicle OFF, disconnect the harness connector at the Q65 Hybrid/EV Battery Pack Coolant Control Valve. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2. Vehicle in Service Mode.
Verify that the test lamp illuminates momentarily when.commanding the Hybrid/EV Battery Pack Coolant Control Solenoid Valve between Normal and Bypass with a scan tool. If the test lamp does not illuminate Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 2 ohms in each of the control circuits end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. After the repair, perform the «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) procedure with a scan tool. If the test lamp illuminates only on one command Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode Test for less than 1 V between each of the control circuit terminals and ground If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Vehicle OFF. Test for infinite resistance between each of the control circuits and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. After the repair, perform the «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) procedure with a scan tool. The test lamp illuminates momentarily between each command
Replace the Q65 Hybrid/EV Battery Pack Coolant Control Valve.

Perform the Diagnostic Repair Verification after completing the repair.

«Drive Motor Battery Coolant Flow Control Valve Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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 vehicle 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.

P0CE5

The hybrid/EV battery pack coolant control valve learn is not running or has completed.

P0CE6 and P0CE7

The 12 V battery voltage is greater than 10.2 V.

P1F58

The hybrid/EV battery pack coolant control valve learn is not running or has completed.
The hybrid/EV battery pack coolant control valve has not moved for greater than 15 s.

P0CE5

Hybrid/EV Battery Pack Coolant Control Valve has not reached its commanded position in less than or equal to 22 s.

P0CE6

The feedback voltage is less than 28 % of the 5 V reference voltage.

P0CE7

The feedback voltage is greater than 72 % of the 5 V reference voltage.

P1F58

Hybrid/EV Battery Pack Coolant Control Valve feedback position is not within 3 % of valve commanded position.

DTCs P0CE5, P0CE6, P0CE7, and P1F58 are type B DTCs.
The Hybrid/EV Powertrain Control Module 2 uses only the two extreme positions of the valve, radiator and 100% chiller

DTCs P0CE5, P0CE6, P0CE7, and P1F58 are type B DTCs.
The «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) will need to be performed.

Verify that the wire harness connector does not have corrosion when diagnosing a DTC P0CE5, P0CE6, P0CE7, or P1F58.
The «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) will need to be performed.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode.
Verify that DTC P0CE5 or P1F58 is not set. If any DTC is set Perform the «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) procedure with a scan tool. If none of the DTCs are set
Verify the Hybrid/EV Battery Pack Coolant Control Solenoid Valve Feedback matches the command when commanding the Hybrid/EV Battery Pack Coolant Control Solenoid between 10%-90% with a scan tool. If the feedback does not match the command Refer to Circuit/System Testing. If the feedback matches the command
All OK.

Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the Q65 Hybrid/EV Battery Pack Coolant Control Valve.
Test for less than 10 ohms between the low reference circuit terminal 5 and ground. If 10 ohms or greater Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. After the repair, perform the «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) procedure with a scan tool. If less than 10 ohms
Vehicle in Service Mode.
Test for 4.8-5.2 V between the 5 V reference circuit terminal 6 and ground. If less than 4.8 V Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. After the repair, perform the «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) procedure with a scan tool. If greater than 5.2 V Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the 5 V reference circuit and ground If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid/EV Powertrain Control Module 2. After the repair, perform the «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) procedure with a scan tool. If within the specified range
Vehicle in Service Mode.
Test for 4.8-5.2 V between the signal circuit terminal 4 and ground. If less than 4.8 V Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. After the repair, perform the «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) procedure with a scan tool. If greater than 5.2 V Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the 5 V reference circuit and ground If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid/EV Powertrain Control Module 2. After the repair, perform the «Hybrid/EV Battery Pack Coolant Control Valve Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybridev-battery-pack-coolant-control-valve) procedure with a scan tool. If within the specified range
Replace the Q65 Hybrid/EV Battery Pack Coolant Control Valve.

Perform the Diagnostic Repair Verification after completing the repair.

«Drive Motor Battery Coolant Flow Control Valve Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV electronics coolant pump circulates coolant through the power electronics coolant radiator, hybrid/EV powertrain control module 1, and the battery charger to control the temperature of the hybrid/EV powertrain control module 1 and the battery charger. An enable signal from the hybrid/EV powertrain control module 2 to the hybrid/EV electronics coolant pump provides overall control of the pump. When this circuit is high, the pump can operate. The pump is controlled with a pulse-width modulated signal from the hybrid/EV powertrain control module 2 to the hybrid/EV electronics coolant pump. The higher the duty cycle the higher the pump speed. The hybrid/EV electronics coolant pump provides a hard-wired pulse-width modulated feedback signal to the hybrid/EV powertrain control module 2. During normal operation, this feedback signal provides pump speed information. The hybrid/EV electronics coolant pump has some self-diagnostic capability. If it determines there is an internal fault it provides this information on this same feedback circuit instead of pump speed information.

P0CE9

The 12 V battery voltage is greater than 10.2 V.
The hybrid/EV electronics coolant pump is enabled.
The hybrid/EV electronics coolant pump is commanded between 5 % and 95 %..

P0CEA

The 12 V battery voltage is greater than 10.2 V.
The vehicle is in Charge Mode.
The hybrid/EV electronics coolant pump is enabled for greater than 300 sec.
The hybrid/EV electronics coolant speed is greater than 30 %.
The outside air temperature status is valid for greater than 300 sec.
None of the following DTCs are set: P0071, P0072, P0073, P0CE9, P0CF0, P0CF1, P1F44, P1F45, P1ED6, P1ED7, or P1ED8.

P1F44

The 12 V battery voltage is greater than 10.2 V.
The hybrid/EV electronics coolant pump is enabled.

P1F45

The 12 V battery voltage is greater than 10.2 V.
The Hybrid/EV Electronics Coolant Pump is disabled.

P0CE9

The Hybrid/EV Powertrain Control Module 2 has detected an open, short to voltage or short to ground on the electronic coolant pump control circuit.

P0CEA

The high voltage charger temperature is greater than 60° C (108° F) for greater than 5 sec.
The hybrid/EV electronics coolant temperature sensor minus the high voltage charger temperature is greater than 60° C (108° F) for greater than 5 sec. OR
The hybrid/EV electronics coolant temperature sensor minus the high voltage charger temperature is greater than the following measurements: 15° C (27° F) at (-10)-50° C (14-122° F) ambient air temperatures. 30° C (54° F) at -20° C (-4° F) ambient air temperature. 40° C (72° F) at -40° C (-40° F) ambient air temperature. OR
The hybrid/EV electronics coolant temperature sensor minus the high voltage charger temperature is greater than the following measurements: 20° C (36° F) at 0-50° C (32-122° F) ambient air temperatures. 25° C (45° F) at -10° C (14° F) ambient air temperature. 30° C (54° F) at -20° C (-4° F) ambient air temperature. 40° C (72° F) at -40° C (-40° F) ambient air temperature.

P1F44

The Hybrid/EV Powertrain Control Module 2 has detected an open, or short to voltage on the electronic coolant pump enable circuit.

P1F45

The Hybrid/EV Powertrain Control Module 2 has detected an open or short to voltage on the electronic coolant pump enable circuit.

DTCs P0CE9, P0CED P1F44, and P1F45 are a type B DTCs.

DTC P0CED P1F44, and P1F45 may cause DTC P0CE9 to set.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode.
Verify that DTC P0C43, P0C44, P0C45, P0C47, or P1EC6 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
Verify the hybrid/EV electronics coolant pump feedback is 50 % +/-5 % when commanding the hybrid/EV electronics coolant pump between 20 % and 90 % with a scan tool. The feedback is not within the specified range Refer to Circuit/System Testing. The feedback is within the specified range
All OK.

Vehicle OFF, disconnect the harness connector at the G35 Hybrid/EV Electronics Coolant Pump.
Test for less than 10 ohms between the ground circuit terminal 4 and ground. If 10 ohms or greater Repair the open/high resistance on the ground circuit. If less than 10 ohms
Vehicle in Service Mode.
Test for B+ between the B+ circuit terminal 5 and the ground circuit terminal 4. If less than B+ Vehicle OFF, test for infinite resistance between the B+ circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms and the fuse is blown, replace the G35 Hybrid/EV Electronics Coolant Pump. If B+
Connect a test lamp between the enable circuit terminal 1 and the ground circuit terminal 4.
Verify the test lamp turns ON and OFF when commanding the hybrid/EV electronics coolant pump between 20% and 90 % with a scan tool. If the test lamp is always illuminated at 10 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the pump enable circuit terminal and ground. If 1 V or greater, repair the short to ground on the circuit. If less than 1 V, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp does not illuminate at 90 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the pump enable circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the pump enable circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp turns OFF and ON when changing between the commanded states
Connect a test lamp between the control circuit terminal 3 and the B+ circuit terminal 5.
Verify the test lamp changes illumination between bright (20 %) and dim (90 %) when commanding the hybrid/EV electronics coolant pump between 20% and 90 % with a scan tool. If the test lamp is always dim or does not illuminate Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 1 V between the control circuit terminal and ground If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp is always bright Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. The test lamp changes illumination between bright (20 %) and dim (90 %)
Remove the test lamp.
Verify the scan tool, Hybrid/EV Electronics Coolant Pump Feedback parameter is less than 10 %. If greater than 10 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the feedback circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. If 10 %
Install a 3 A fused jumper wire between the feedback circuit terminal 2 and the ground circuit terminal 4.
Verify the scan tool, Hybrid/EV Electronics Coolant Pump Feedback parameter is greater than 90 %. If less than 90 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 1 V between the feedback circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If 90 % or greater
Replace the G35 Hybrid/EV Electronics Coolant Pump.

Perform the Diagnostic Repair Verification after completing the repair.

«Generator Control Module Coolant Pump Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV electronics has a coolant temperature sensor. The hybrid/EV electronics coolant temperature sensor is located in the coolant radiator. The temperature sensor is a variable resistor that measures the temperature of the hybrid/EV electronics coolant. The hybrid/EV electronics coolant temperature sensor resistance changes with battery coolant temperature. The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the lower the resistance of the sensor. The hybrid/EV powertrain control module 2 uses the hybrid/EV electronics coolant temperature sensor to determine the hybrid/EV electronics temperature to control the hybrid/EV electronics cooling operation.

P0CEF

The 12 V battery voltage is greater than or equal to 9 V.
Vehicle is in Service Mode or Vehicle ON.
No fault on power inverter max temperature sensor.
Hybrid/EV electronics coolant pump off soak time is greater than 6 hours OR hybrid/EV electronics coolant pump off soak time is greater than 6 hours and has been enabled for less than 15 seconds.
None of the following DTCs are set; P0606, P0CF1, P0CF0, P0CE9, P0CED, P0A2D, P0A2C, P0A2B, P0A2F, P0A31, P0A32, P0A33, or P0A35. OR
The 12 V battery voltage is greater than or equal to 9 V.
Vehicle ON.
The propulsion system active.
The hybrid/EV electronics coolant pump is enabled.
The hybrid/EV electronics coolant pump speed (duty cycle) is between within 30% and 90%.
None of the following DTCs are set; P0CF1, P0CF0, P0CE9, P0CED, P1ED6, P1ED7, P1ED8, P0A2D, P0A2C, P0A2B, P0A2F, P0A31, P0A32, P0A33, or P0A35. OR
The 12 V battery voltage is greater than or equal to 9 V.
Vehicle OFF.
The hybrid/EV electronics coolant pump is enabled.
The hybrid/EV electronics coolant pump speed (duty cycle) is between within 30% and 90%.
The vehicle is in charge mode.
None of the following DTCs are set; P0CF1, P0CF0, P0CE9, P0CED, P1ED7, P1ED6, or P1ED8.

P0CF0 and P0CF1

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

P0CEF

The coolant temperature does not fall within 30°C (86°F) of the Drive Motor A Inverter Temperature or Drive Motor B Inverter Temperature (the higher of the two readings). OR
The coolant temperature does not fall within 20°C (68°F) and the battery charger temperature is 10°C (50°F). OR
The coolant temperature does not fall within 10°C (50°F) of the battery charger temperature.

P0CF0

The hybrid/EV electronics coolant temperature is greater than 87.5°C (189.5°F).

P0CF1

The hybrid/EV electronics temperature is less than -40°C (-40°F).

DTC P0CEF-P0CF1 are type B DTCs.

Low or no coolant in the system may set a DTC P0CF0.
An inoperative hybrid/EV electronics coolant pump may set a DTC P0CEF.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode, verify that DTC P0CE9 or P0CED is not set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
Verify the Hybrid Electronics Coolant Temperature is between -39 and +85°C (-38.2 and +185°F) with a scan tool. If not within the specified range Refer to Circuit/System Testing. If within the specified range
All OK.

Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the B202 Hybrid/EV Electronics Coolant Temperature Sensor.
Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 2 ohms in each of the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If less than 10 ohms
Vehicle in Service Mode.
Verify the scan tool Hybrid Electronics Coolant Temperature is less than -35 °C (-38.2 °F). If -35 °C (-38.2 °F) or greater Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between each of the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. If less than -35° C (-38.2° F)
Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
Verify the scan tool Hybrid Electronics Coolant Temperature is greater than 127 °C (260.6 °F). If less than 127 °C (260.6 °F) Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Vehicle OFF, test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If 127 °C (260.6 °F) or greater
Replace the B202 Hybrid/EV Electronics Coolant Temperature Sensor.

Component Testing

Vehicle OFF, disconnect the harness connector at the B202 Hybrid/EV Electronics Coolant Temperature Sensor.
Test for 54-75.5k ohms at approximately 21.11°C (70°F) between the signal terminal and the low reference terminal. If not within the specified range Replace the B202 Hybrid/EV Electronics Coolant Temperature Sensor. If within the specified range
All OK.

Perform the Diagnostic Repair Verification after completing the repair.

«Coolant Temperature Sensor Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The 14 V power module cooling fan blows air through the 14 V power module to control the temperature of the 14 V power module. The fan is controlled with a pulse-width modulated signal sent from the hybrid/EV powertrain control module 2 to the 14 V power module fan. The longer the duty cycle on the signal the higher the fan speed. Maximum fan speed is 3900 RPM. An enable signal from the hybrid/EV powertrain control module 2 to the 14 V power module fan provides overall control of the fan. When this circuit is high, the fan can operate. The 14 V power module fan provides a hard-wired pulse-width modulated feedback signal to the hybrid/EV powertrain control module 2. During normal operation, this feedback signal provides fan speed information. The 14 V power module fan has some self-diagnostic capability. If it determines there is an internal fault it provides this information on this same feedback circuit instead of speed information.

P1FF5 and P1FF9

The 12 V battery voltage is greater than or equal to 10.2 V.
The 14 V power module fan is enabled

P1FFA

The 12 V battery voltage is greater than or equal to 10.2 V.
The 14 V power module fan is not enabled

P1FF5

The hybrid/EV powertrain control module 2 has detected an open, short to voltage or short to ground on the 14 V power module cooling fan control circuit

P1FF9

The hybrid/EV powertrain control module 2 has detected a short to ground on the 14 V power module cooling fan enable circuit.

P1FFA

The hybrid/EV powertrain control module 2 has detected an open or short to voltage on the 14 V power module cooling fan enable circuit.

DTCs P1FF5, P1FF9, and P1FFA are type C DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode.
Verify the G38 14 V Power Module Fan speed increases and decreases when commanding the 14 V Power Module Fan Speed between 10 %-90 % with a scan tool. If the fan speed does not increase and decrease Refer to Circuit/System Testing. If the fan speed increases and decreases
All OK.

Vehicle OFF, disconnect the harness connector at the G38 14 V Power Module Cooling Fan.
Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
Vehicle in Service Mode.
Test for greater than B+ between the B+ circuit terminal 5 and the ground circuit terminal 1. If less than B+ Vehicle OFF, test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms and the fuse is blown, replace the G38 14 V Power Module Cooling Fan. If B+
Connect a test lamp between the enable circuit terminal 4 and ground circuit terminal 1.
Verify the test lamp turns OFF and ON when commanding the 14 V Power Module Fan Command OFF (10 %) and ON (90 %) with a scan tool. If the test lamp is always illuminated at 10 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the enable circuit and ground If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp does not illuminate at 90 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the enable circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the enable circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp turns ON and OFF
Connect a test lamp between the control circuit terminal 3 and the B+ circuit terminal 5.
Verify that a test lamp changes illumination between bright (10%) and dim (90%) when commanding the 14 V Power Module Fan ON between 10% and 90% with a scan tool. If the test lamp is always dim or does not illuminate Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Vehicle OFF. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp is always bright Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. The test lamp changes illumination between bright (20 %) and dim (90 %)
Verify the scan tool 14 V Power Module Fan Feedback parameter is less than 10 %. If 10 % or greater Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the feedback circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. If less than 10 %
Install a 3 A fused jumper wire between the feedback circuit terminal 2 and the B+ circuit terminal 5.
Verify the scan tool 14 V Power Module Fan Feedback is greater than 90 %. If 90 % or less Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the feedback circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Vehicle OFF. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If greater than 90 %
Replace the G38 14 V Power Module Cooling Fan.

Perform the Diagnostic Repair Verification after completing the repair.

«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

P148A

2011-2012

The 12 V battery voltage is greater than or equal to 9 V.
The propulsion system is active.
The cooling fans are enabled for more than 10 seconds.
None of the following DTCs are set: P148B, or P148C. OR
The 12 V battery voltage is greater than or equal to 9 V.
The propulsion system is inactive.
The energy storage system thermal condition request is ActiveCool.
The cooling fans are enabled for more than 10 seconds.
None of the following DTCs are set: P148B, or P148C.

2013-2014

The 12 V battery voltage is greater than or equal to 10.2 V.
The propulsion system is active.
The cooling fans are enabled for more than 10 seconds.
None of the following DTCs are set: P148B, P148C, or U0293. OR
The 12 V battery voltage is greater than or equal to 10.2 V.
The propulsion system is inactive.
The energy storage system thermal condition request is ActiveCool.
The cooling fans are enabled for more than 10 seconds.
None of the following DTCs are set: P148B, P148C, or U0293.

P148B

2011-2012

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

2013-2014

The 12 V battery voltage is greater than or equal to 10.2 V.

P148C

2011-2012

The 12 V battery voltage is greater than or equal to 9 V.
The propulsion system is active.
The cooling fans are enabled for more than 10 seconds.
OR
The 12 V battery voltage is greater than or equal to 9 V.
The propulsion system is inactive.
The energy storage system thermal condition request is ActiveCool.
The cooling fans are enabled for more than 10 seconds.

2013-2014

The 12 V battery voltage is greater than or equal to 10.2 V.
The propulsion system is active.
The cooling fans are enabled for more than 10 seconds. OR
The 12 V battery voltage is greater than or equal to 10.2 V.
The propulsion system is inactive.
The energy storage system thermal condition request is ActiveCool.
The cooling fans are enabled for more than 10 seconds.

P148A

The PWM fan duty cycle request from engine control module (Hardwire) is not within 30% of the requested engine cooling fan speed sent to the hybrid/EV powertrain control module 2 via serial data.

P148B

The hybrid/EV powertrain control module 2 has detected a duty cycle of greater than 97% from the engine control module.

P148C

The hybrid/EV powertrain control module 2 has detected a duty cycle of less than 3% from the engine control module.

DTCs P148A, P148B and P148C are type B DTCs.

Schematic Reference

Engine Heating/Cooling Schematics

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode.
Verify that the cooling fans are operating when commanding the Cooling Fan Motor Command ON with a scan tool. If the cooling fans are not operating Refer to Circuit/System Testing If the cooling fans are operating
All OK.

Vehicle OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Vehicle in Service Mode.
Test for 4.8-5.2 V between the signal circuit terminal 41 and ground. If 4.8 V or less Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If 5.2 V or greater Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid/EV Powertrain Control Module 2. If within the specified range
Replace the K20 Engine Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for engine control module or hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery assembly. The 5 high voltage contactors are a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor, charge negative high voltage contactor, and multi-function high voltage contactor. The 2 transistors are the precharge transistor and heater transistor. These contactors/transistors close and open in sequence and are controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high voltage contactors/transistors. Ground is provided through the case ground.

The hybrid/EV battery pack coolant heater is mounted to the coolant inlet on the back side of the hybrid/EV battery contactor assembly. They hybrid/EV battery pack coolant heater uses a 360 V power source.

After the vehicle is turned ON, the hybrid/EV battery pack coolant heater is commanded ON. The hybrid/EV powertrain control module 2 monitors the temperature change at the hybrid/EV battery pack coolant temperature sensor 1 to determine if the hybrid/EV battery pack coolant heater is functioning properly.

The 12 V battery voltage is greater than or equal to 9 V.
The vehicle is not connected to an active AC source.
The hybrid/EV battery pack coolant temperature sensor 1 is less than 45°C (113°F).
The difference between the hybrid/EV battery pack coolant temperature sensor 1 and the hybrid/EV battery average cell temperature is less the 25°C (77°F)
Runs once per ignition cycle when propulsion system goes active.
None of the following DTCs are set; P1EC3, P1EC4, P1EC5, P0C44, P0C45, P1F18, P0C47, or U0111.

The hybrid/EV powertrain control module 2 did not see the battery pack coolant temperature sensor 1 rise fast enough during the test period of one minute. The required increase in temperature is approximately 1°C (1.8°F) change for every 2 seconds.

DTC P1EC6 is a type B DTC.
The hybrid/EV battery pack coolant heater will be disabled.

DTC P1EC6 is a type B DTC.

P1EC6 will prevent battery heating and the vehicle will be unable to start in cold weather with battery temperatures below -25°C (-13°F).
A malfunctioning pack heater may have discoloration of the metal housing or the metal housing may be deformed.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit
EL-50772 Insulation Multimeter

For equivalent regional tools, refer to Special Tools .

Vehicle in Service Mode.
Verify that DTC P0AA1, P0AD9, P0ADD, P0AE2, P0AE4, P0AFA, P0C43, P0C44, P0C45, P0C47, P0D0A, P0D11, P0D22, P1E8C, P1E8D, P1EBC-P1EBF, P1EC0, P1EC3, P1EC5, P1F18, or P1FFB-P1FFE is not set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
Vehicle OFF. Remove the G37 Hybrid/EV Battery Pack Coolant Pump fuse. Set the vehicle Charge Mode to IMMEDIATE. Connect the charge cord set. With the vehicle in Charge Mode, Vehicle in Service Mode.
Verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 1 parameter increases 3° C (5.4° F) within 120 s when command the hybrid/EV battery pack coolant heater ON with a scan tool. If the Hybrid/EV Battery Pack Coolant Temperature Sensor 1 did not increase 3° C (5.4° F) within 120 s Refer to Circuit/System Testing. If the Hybrid/EV Battery Pack Coolant Temperature Sensor 1 did increase 3° C (5.4° F) within 120 s
All OK.

WARNING

Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
Remove the Drive Motor Battery Cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) . Disconnect the harness connector at the E54 Hybrid/EV Battery Pack Coolant Heater.
Test for 61-75 ohms between terminal A and terminal B at the E54 Hybrid/EV Battery Pack Coolant Heater. If not within the specified range Verify that the charger maxi-fuse is not blown. Replace the charger maxi-fuse if it is blown and the E54 Hybrid/EV Battery Pack Coolant Heater. If within the specified range
Test for greater than 550M ohms between the E54 Hybrid/EV Battery Pack Coolant Heater terminals listed below and battery tray ground with the EL-50772 , set on the Isolation test setting: Terminal A Terminal B If less than 550M ohms Verify that the charger maxi-fuse is not blown. Replace the charger maxi-fuse if it is blown and the E54 Hybrid/EV Battery Pack Coolant Heater. If 550M ohms or greater
Replace the A28 Hybrid/EV Battery Contactor Assembly.

Perform the Diagnostic Repair Verification after completing the repair.

«Battery Heater Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
«Battery Charger and 14 V Power Module Maxi Fuse Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
«Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV battery pack has a coolant level sensor. The hybrid/EV battery pack coolant level sensor is attached to the coolant surge tank. The level sensor is a 2 state switch which changes state when the level of the hybrid/EV battery pack coolant in the surge tank reaches approximately 100mL. The hybrid/EV powertrain control module 2 supplies 5 V to the signal circuit and a ground for the low reference circuit. The hybrid/EV battery pack coolant level sensor resistance changes states when the battery coolant level in the surge tank gets low. The low level state is the lower resistance state of the sensor. The normal level state is the higher resistance state of the sensor. The hybrid/EV powertrain control module 2 uses the hybrid/EV battery pack coolant level sensor to determine if disabling the hybrid/EV battery pack charging operation is necessary due to a loss of coolant.

P1FFB, P1FFC, and P1FFD

The hybrid powertrain control module 2 and battery energy control module are awake and communicating

P1FFE

The vehicle speed is zero for more than 30 seconds
The battery pack temperature is greater than 0°C (32°F)
The battery pack coolant outlet temperature is greater than 0°C (32°F)
Once DTC is set the DTC will not run again until a clear code command is sent.

P1FFB

The hybrid/EV battery pack coolant level sensor voltage is between 2.8 V - 3.1 V

P1FFC

The hybrid/EV battery pack coolant level sensor voltage is below 1.4 V

P1FFD

The hybrid/EV battery pack coolant level sensor voltage is above 4.0 V

P1FFE

The hybrid/EV battery pack coolant level sensor voltage is between 1.4 V - 2.8 V for more than 2 consecutive key cycles

DTC P1FFB, P1FFC, P1FFD, and P1FFE are type A DTCs.
The driver information center (DIC) displays the SERVICE HIGH VOLTAGE CHARGING SYSTEM message.
Hybrid/EV battery pack charging will be disabled.

DTC P1FFB, P1FFC, P1FFD, and P1FFE are type A DTCs.
DTC P1FFE will only clear with a clear code command.

Parking the vehicle on a steep incline may set DTC P1FFE.
Having an incorrect / mismatched calibration without the hybrid/EV battery pack coolant level sensor update performed may set DTC P1FFB, P1FFC, P1FFD, P1FFE, or P1FFF.
DTC P1FFE will not clear or go to history with ignition cycles once DTC is set. DTC P1FFE will only clear with a clear code command.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Verify the K114B hybrid/EV powertrain control module 2 is programmed with the correct software calibration to match the vehicle configuration. If the correct software is not installed Program the K114B hybrid/EV powertrain control module 2. Refer to «Hybrid Powertrain Control Module 2 Programming and Setup»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__hybrid-powertrain-control-module-2-programming) If the correct software is installed
Verify that the vehicle hybrid/EV battery cooling system is full. If the hybrid/EV battery cooling system is low Refer to Hybrid Cooling System Loss of Coolant (Battery), «Hybrid Cooling System Loss of Coolant (Power Electronics)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybrid-cooling-system-loss-of-coolant) , «Hybrid Cooling System Loss of Coolant (Battery)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybrid-cooling-system-loss-of-coolant) If the hybrid/EV battery cooling system is full
Refer to Circuit/System Testing.

Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the B258 Hybrid/EV Battery Coolant Level Sensor.
Test for less than 10 ohms between the low reference circuit terminal B and ground. If 10 ohms or greater Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If less than 10 ohms
Vehicle in Service Mode.
Test for 4.8-5.2 V between the 5 V signal circuit terminal A and ground. If 4.8 V or less Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If 5.2 V or greater Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid/EV Powertrain Control Module 2. If within the specified range
Vehicle OFF, remove the B258 Hybrid/EV Battery Coolant Level Sensor from the coolant surge tank.
Test for 24-25.4k ohms between the signal terminal A and the low reference terminal B. If not within the specified range Replace the B258 Hybrid/EV Battery Coolant Level Sensor. If within the specified range
Using a magnet, place the magnet off center of the B258 Hybrid/EV Battery Coolant Level Sensor, opposite of the terminals on the epoxy side to closed the internal switch.
Test for 7.1-7.54k ohms between the signal terminal A and the low reference terminal B. If not within the specified range Replace the B258 Hybrid/EV Battery Coolant Level Sensor. If within the specified range
Replace the coolant surge tank.

Perform the Diagnostic Repair Verification after completing the repair.

«Drive Motor Battery Coolant Level Sensor Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
«Drive Motor Battery Radiator Surge Tank Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV battery pack has a coolant level sensor. The hybrid/EV battery pack coolant level sensor is attached to the coolant surge tank. The level sensor is a 2 state switch which changes state when the level of the hybrid/EV battery pack coolant in the surge tank reaches approximately 100mL. The hybrid/EV powertrain control module 2 supplies 5 V to the signal circuit and a ground for the low reference circuit. The hybrid/EV battery pack coolant level sensor resistance changes states when the battery coolant level in the surge tank gets low. The low level state is the lower resistance state of the sensor. The normal level state is the higher resistance state of the sensor. The hybrid/EV powertrain control module 2 uses the hybrid/EV battery pack coolant level sensor to determine the hybrid/EV battery pack level to control the hybrid/EV battery pack charging operation.

The hybrid powertrain control module 2 and battery energy control module are awake and communicating
Once DTC is set the DTC will not run again until a clear code command is sent.

If DTC P0AA6, P1AE6, P1F0E, P1FFB, P1FFC, P1FFD, or P1FFE is set, DTC P1FFF will be set

DTC P1FFF is a type A DTC.
The driver information center (DIC) displays the SERVICE HIGH VOLTAGE CHARGING SYSTEM message.
Hybrid/EV battery pack charging will be disabled.

DTC P1FFF is a type A DTC.
DTC P1FFF will only clear with a clear code command.

Parking the vehicle on a steep incline may set DTC P1FFE.
Having an incorrect / mismatched calibration without the hybrid/EV battery pack coolant level sensor update performed may set DTC P1FFB, P1FFC, P1FFD, P1FFE, or P1FFF.
DTC P1FFF will not clear or go to history with ignition cycles once DTC is set. DTC P1FFF will only clear with a clear code command.

Schematic Reference

Connector End View Reference

Drive Motor Battery System Description

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC P0AA6, P1AE6, P1F0E, P1FFB, P1FFC, P1FFD, or P1FFE are not set. If DTC P0AA6, P1AE6, or P1F0E is set Refer to «DTC P0AA6, P1AE6, or P1F0E»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If DTC P1FFB, P1FFC, P1FFD, or P1FFE is set Refer to «DTC P1FFB-P1FFE»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system) If none of the DTCs are set
Verify that the vehicle hybrid/EV battery cooling system is full. If the hybrid/EV battery cooling system is low Refer to Hybrid Cooling System Loss of Coolant (Battery), «Hybrid Cooling System Loss of Coolant (Power Electronics)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybrid-cooling-system-loss-of-coolant) , «Hybrid Cooling System Loss of Coolant (Battery)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybrid-cooling-system-loss-of-coolant) If the hybrid/EV battery cooling system is full
Clear Codes. Verify DTC P1FFF does not set. If DTC P1FFF is set Program the K114B Hybrid/EV Powertrain Control Module 2. Refer to «Hybrid Powertrain Control Module 2 Programming and Setup»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__hybrid-powertrain-control-module-2-programming) Verify DTC P1FFF does not set. If DTC P1FFF resets after programming and no other DTCs are set, replace the K114B hybrid/EV powertrain control module 2. If DTC P1FFF is not set
All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for hybrid/EV powertrain control module 2 replacement, programming and setup.

Hybrid/EV Electronics Cooling Diagnostic

Step	Action	Yes	No
1	Were you sent here from Symptoms or another diagnostic table?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	WARNING: Refer to Moving Parts and Hot Surfaces Warning . WARNING: Wear safety glasses in order to avoid eye damage. Add coolant to the coolant surge tank as needed. Refer to Drive Motor Generator Power Inverter Module Cooling System Draining and Filling . Using GDS, turn on the hybrid electronics coolant pump and increase the RPM to 1000. Quickly remove and install the drive motor generator control module radiator outlet hose from the drive motor generator power inverter module. Refer to Drive Motor Generator Control Module Radiator Outlet Hose Replacement . Is there coolant flowing out of the drive motor generator power inverter module?	Go to Step 10	Go to Step 3
3	Quickly remove and install the drive motor power inverter module cooling inlet hose from the drive motor generator power inverter module. Refer to Drive Motor Power Inverter Module Cooling Inlet Hose Replacement . Is there coolant flowing out of the drive motor power inverter module cooling inlet hose?	Go to Step 12	Go to Step 4
4	Quickly remove and install the drive motor power inverter module cooling inlet hose from the drive motor battery coolant radiator. Refer to Drive Motor Power Inverter Module Cooling Inlet Hose Replacement . Is there coolant flowing out of the drive motor battery coolant radiator?	Go to Step 14	Go to Step 5
5	Quickly remove and install the generator control module coolant radiator hose from the drive motor battery coolant radiator. Refer to Generator Control Module Coolant Radiator Hose Replacement . Is there coolant flowing out of the generator control module coolant radiator hose?	Go to Step 15	Go to Step 6
6	Quickly remove and install the generator control module coolant radiator hose from the drive motor battery charger. Refer to Generator Control Module Coolant Radiator Hose Replacement . Is there coolant flowing out of the drive motor battery charger?	Go to Step 16	Go to Step 7
7	Quickly remove and install the drive motor power inverter module cooling outlet hose from the drive motor battery charger. Refer to Drive Motor Power Inverter Module Cooling Outlet Hose Replacement . Is there coolant flowing out of the drive motor generator control module cooling outlet hose?	Go to Step 17	Go to Step 8
8	Quickly remove and install the drive motor power inverter module cooling outlet hose from the generator control module coolant pump. Refer to Drive Motor Power Inverter Module Cooling Outlet Hose Replacement . Is there coolant flowing out of the generator control module cooling pump?	Go to Step 19	Go to Step 9
9	Replace the generator control module coolant pump. Refer to Generator Control Module Coolant Pump Replacement . Is the repair complete?	Go to Step 20	Go to Step 1
10	Inspect for kinks or obstructions in the drive motor generator control module radiator outlet hose or the generator control module coolant pump hose. Refer to Drive Motor Generator Control Module Radiator Outlet Hose Replacement , or Generator Control Module Coolant Pump Hose Replacement . Is there a kink or obstruction?	Go to Step 11	Go to Step 1
11	Replace the drive motor generator control module radiator outlet hose or the generator control module coolant pump hose. Refer to Drive Motor Generator Control Module Radiator Outlet Hose Replacement , or Generator Control Module Coolant Pump Hose Replacement . Is the repair complete?	Go to Step 20	Go to Step 1
12	Using GDS, turn off the hybrid electronics coolant pump. Remove the drive motor power inverter module cooling inlet hose from the drive motor generator power inverter module. Refer to Drive Motor Power Inverter Module Cooling Inlet Hose Replacement . Remove the drive motor generator control module radiator outlet hose from the drive motor generator power inverter module. Refer to Drive Motor Generator Control Module Radiator Outlet Hose Replacement . Back flush the drive motor generator power inverter module cooling passages. Install the drive motor power inverter module cooling inlet hose. Refer to Drive Motor Power Inverter Module Cooling Inlet Hose Replacement . Install the drive motor generator control module radiator outlet hose. Refer to Drive Motor Generator Control Module Radiator Outlet Hose Replacement . Using GDS, turn on the hybrid electronics coolant pump and increase the RPM to 1000. Quickly remove and install the drive motor generator control module radiator outlet hose from the drive motor generator power inverter module. Refer to Drive Motor Generator Control Module Radiator Outlet Hose Replacement . Is there coolant flowing out of the drive motor generator power inverter module?	Go to Step 20	Go to Step 13
13	Replace the drive motor generator power inverter module. Refer to Drive Motor Generator Power Inverter Module Replacement . Is the repair complete?	Go to Step 20	Go to Step 1
14	Replace the drive motor power inverter module cooling inlet hose. Refer to Drive Motor Power Inverter Module Cooling Inlet Hose Replacement . Is the repair complete?	Go to Step 20	Go to Step 1
15	Replace the drive motor battery coolant radiator. Refer to Drive Motor Battery Coolant Radiator Replacement . Is the repair complete?	Go to Step 20	Go to Step 1
16	Replace the generator control module coolant radiator hose. Refer to Generator Control Module Coolant Radiator Hose Replacement . Is the repair complete?	Go to Step 20	Go to Step 1
17	Using GDS, turn off the hybrid electronics coolant pump. Remove the generator control module coolant radiator hose from the drive motor battery charger. Refer to Generator Control Module Coolant Radiator Hose Replacement . Remove the drive motor power inverter module cooling outlet hose from the drive motor battery charger. Refer to Drive Motor Power Inverter Module Cooling Outlet Hose Replacement . Back flush the drive motor battery charger cooling passages. Install the generator control module coolant radiator hose. Refer to Generator Control Module Coolant Radiator Hose Replacement . Install the drive motor power inverter module cooling outlet hose. Refer to Drive Motor Power Inverter Module Cooling Outlet Hose Replacement . Using GDS, turn on the hybrid electronics coolant pump and increase the RPM to 1000. Quickly remove and install the drive motor power inverter module cooling outlet hose from the drive motor battery charger. Refer to Drive Motor Power Inverter Module Cooling Outlet Hose Replacement . Is there coolant flowing out of the drive motor generator control module cooling outlet hose?	Go to Step 20	Go to Step 18
18	Replace the drive motor battery charger. Refer to Drive Motor Battery Charger Replacement . Is the repair complete?	Go to Step 20	Go to Step 1
19	Replace the drive motor power inverter module cooling outlet hose. Refer to Drive Motor Power Inverter Module Cooling Outlet Hose Replacement . Is the repair complete?	Go to Step 20	Go to Step 1
20	Add coolant to the coolant surge tank as needed. Refer to Drive Motor Generator Power Inverter Module Cooling System Draining and Filling . Operate the system in order to verify the repair. Did you find and correct the condition?	System OK	Go to Step 1

WARNING
Refer to Moving Parts and Hot Surfaces Warning .

WARNING
Wear safety glasses in order to avoid eye damage.

Hybrid/EV Electronics Cooling Diagnostic

Hybrid/EV Battery Cooling Diagnostic

Step	Action	Yes	No
1	Were you sent here from Symptoms or another diagnostic table?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	WARNING: Refer to Moving Parts and Hot Surfaces Warning . WARNING: Wear safety glasses in order to avoid eye damage. Add coolant to the coolant surge tank as needed. Refer to Drive Motor Battery Cooling System Draining and Filling . Using GDS, turn on the drive motor battery coolant pump. Quickly remove and install the drive motor battery coolant cooler inlet hose from the drive motor battery coolant pump. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Replacement (4 Way Valve to Chiller) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Pump to Pipe) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Radiator Surge Tank to Pipe) . Is there coolant flowing out of the drive motor battery coolant pump?	Go to Step 3	Go to Step 1
3	Using GDS, position the drive motor battery coolant flow control valve in the bypass position. Pinch the drive motor battery coolant cooler inlet hose assembly at the drive motor battery coolant flow control valve bypass port. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement . Pressurize the battery cooling system. Refer to Hybrid Cooling System Leak Test . Quickly remove and install the drive motor battery coolant cooler outlet hose from the drive motor battery coolant flow control valve. Refer to Drive Motor Battery Coolant Cooler Outlet Hose Replacement (Battery Outlet to Valve) . Is there coolant flowing out of the drive motor battery coolant cooler outlet hose?	Go to Step 11	Go to Step 4
4	Quickly remove and install the drive motor battery coolant cooler outlet hose from the drive motor battery. Refer to Drive Motor Battery Coolant Cooler Outlet Hose Replacement (Battery Outlet to Valve) . Is there coolant flowing out of the drive motor battery?	Go to Step 26	Go to Step 5
5	Quickly remove and install the drive motor battery coolant cooler inlet hose assembly from the drive motor battery. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement . Is there coolant flowing out of the drive motor battery coolant cooler inlet hose assembly?	Go to Step 27	Go to Step 6
6	Remove the drive motor battery coolant filter. Refer to Drive Motor Battery Coolant Filter Replacement . Is there coolant flowing out of the drive motor battery coolant cooler inlet hose assembly?	Go to Step 28	Go to Step 7
7	Quickly remove and install the drive motor battery coolant cooler inlet hose assembly from the drive motor battery coolant cooler inlet hose. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Replacement (4 Way Valve to Chiller) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Pump to Pipe) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Radiator Surge Tank to Pipe) . Is there coolant flowing out of the drive motor battery coolant cooler inlet hose?	Go to Step 29	Go to Step 8
8	Quickly remove and install the drive motor battery coolant cooler inlet hose from the drive motor battery coolant pump. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Replacement (4 Way Valve to Chiller) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Pump to Pipe) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Radiator Surge Tank to Pipe) . Is there coolant flowing out of the drive motor battery coolant pump?	Go to Step 30	Go to Step 9
9	Quickly remove and install the drive motor battery coolant pump inlet hose from the drive motor battery coolant pump. Refer to Drive Motor Battery Coolant Pump Inlet Hose Replacement . Is there coolant flowing out of the drive motor battery coolant pump inlet hose?	Go to Step 36	Go to Step 10
10	Quickly remove and install the drive motor battery coolant pump inlet hose from the drive motor battery radiator surge tank. Refer to Drive Motor Battery Coolant Pump Inlet Hose Replacement . Is there coolant flowing out of the drive motor battery radiator surge tank?	Go to Step 37	Go to Step 38
11	Using GDS, position the drive motor battery coolant flow control valve in the bypass position. Pressurize the battery cooling system. Refer to Hybrid Cooling System Leak Test . Quickly remove and install the drive motor battery coolant cooler inlet hose assembly from the drive motor battery coolant flow control valve radiator port. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement . Is there coolant flowing out of the drive motor battery coolant cooler inlet hose assembly?	Go to Step 16	Go to Step 12
12	Quickly remove and install the drive motor battery coolant cooler inlet hose assembly from the drive motor battery radiator inlet hose. Refer to Drive Motor Battery Radiator Inlet Hose Replacement . Is there coolant flowing out of the drive motor battery radiator inlet hose?	Go to Step 29	Go to Step 13
13	Quickly remove and install the drive motor battery radiator inlet hose from the drive motor battery coolant radiator. Refer to Drive Motor Battery Radiator Inlet Hose Replacement . Is there coolant flowing out of the drive motor battery coolant radiator?	Go to Step 31	Go to Step 14
14	Quickly remove and install the drive motor battery radiator outlet hose from the drive motor battery coolant radiator. Refer to Drive Motor Battery Radiator Outlet Hose Replacement . Is there coolant flowing out of the drive motor battery radiator outlet hose?	Go to Step 35	Go to Step 23
15	Quickly remove and install the drive motor battery radiator outlet hose from the drive motor battery radiator surge tank. Refer to Drive Motor Battery Radiator Outlet Hose Replacement . Is there coolant flowing out of the drive motor battery radiator surge tank?	Go to Step 32	Go to Step 38
16	Using GDS, position the drive motor battery coolant flow control valve in the bypass position. Pressurize the battery cooling system. Refer to Hybrid Cooling System Leak Test . Quickly remove and install the drive motor battery coolant cooler inlet hose from the drive motor battery coolant flow control valve cooler port. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Replacement (4 Way Valve to Chiller) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Pump to Pipe) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Radiator Surge Tank to Pipe) . Is there coolant flowing out of the drive motor battery coolant cooler inlet hose?	Go to Step 19	Go to Step 17
17	Quickly remove and install the drive motor battery coolant cooler inlet hose from the drive motor battery coolant cooler. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Replacement (4 Way Valve to Chiller) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Pump to Pipe) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Radiator Surge Tank to Pipe) . Is there coolant flowing out of the drive motor battery coolant cooler?	Go to Step 29	Go to Step 18
18	Quickly remove and install the drive motor battery coolant cooler inlet hose assembly from the drive motor battery coolant cooler. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement . Is there coolant flowing out of the drive motor battery coolant cooler inlet hose assembly?	Go to Step 25	Go to Step 19
19	Using GDS, position the drive motor battery coolant flow control valve in the radiator position. Pressurize the battery cooling system. Refer to Hybrid Cooling System Leak Test . Quickly remove and install the drive motor battery coolant cooler inlet hose assembly from the drive motor battery coolant flow control valve bypass port. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement . Is there coolant flowing out of the drive motor battery coolant cooler inlet hose assembly?	Go to Step 22	Go to Step 20
20	Quickly remove and install the drive motor battery coolant cooler inlet hose assembly from the drive motor battery coolant cooler outlet hose. Refer to Drive Motor Battery Coolant Cooler Outlet Hose Replacement (Battery Outlet to Valve) . Is there coolant flowing out of the drive motor battery coolant cooler outlet hose?	Go to Step 29	Go to Step 21
21	Quickly remove and install the drive motor battery coolant cooler outlet hose from the drive motor battery radiator surge tank. Refer to Drive Motor Battery Coolant Cooler Outlet Hose Replacement (Battery Outlet to Valve) . Is there coolant flowing out of the drive motor battery radiator surge tank?	Go to Step 34	Go to Step 38
22	Using GDS, position the drive motor battery coolant flow control valve in the radiator position. Pressurize the battery cooling system. Refer to Hybrid Cooling System Leak Test . Pinch and quickly remove and install the drive motor battery coolant cooler inlet hose assembly from the drive motor battery coolant flow control valve radiator port. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement . Is there coolant flowing out of the drive motor battery coolant flow control valve radiator port?	Go to Step 23	Go to Step 1
23	Using GDS, position the drive motor battery coolant flow control valve in the bypass position. Pressurize the battery cooling system. Refer to Hybrid Cooling System Leak Test . Pinch and quickly remove and install the drive motor battery coolant cooler inlet hose assembly from the drive motor battery coolant flow control valve bypass port. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement . Is there coolant flowing out of the drive motor battery coolant flow control valve bypass port?	Go to Step 24	Go to Step 1
24	Using GDS, position the drive motor battery coolant flow control valve in the cooler position. Pressurize the battery cooling system. Refer to Hybrid Cooling System Leak Test . Pinch and quickly remove and install the drive motor battery coolant cooler inlet hose at the drive motor battery coolant flow control valve cooler port. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Replacement (4 Way Valve to Chiller) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Pump to Pipe) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Radiator Surge Tank to Pipe) . Is there coolant flowing out of the drive motor battery coolant flow control valve cooler port?	Go to Step 39	Go to Step 1
25	Replace the drive motor coolant cooler. Refer to Drive Motor Battery Coolant Cooler Replacement . Is the repair complete?	Go to Step 39	Go to Step 1
26	Replace the drive motor battery coolant cooler outlet hose. Refer to Drive Motor Battery Coolant Cooler Outlet Hose Replacement (Battery Outlet to Valve) . Is the repair complete?	Go to Step 39	Go to Step 1
27	Replace or repair the drive motor battery. Refer to Drive Motor Battery Replacement and Shipping Preparation . Is the repair complete?	Go to Step 39	Go to Step 1
28	Replace the drive motor battery coolant filter. Refer to Drive Motor Battery Coolant Filter Replacement . Is the repair complete?	Go to Step 39	Go to Step 1
29	Replace the drive motor battery coolant cooler inlet hose assembly. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement . Is the repair complete?	Go to Step 39	Go to Step 1
30	Replace the drive motor battery coolant cooler inlet hose. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Replacement (4 Way Valve to Chiller) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Pump to Pipe) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Radiator Surge Tank to Pipe) . Is the repair complete?	Go to Step 39	Go to Step 1
31	Replace the drive motor battery radiator inlet hose. Refer to Drive Motor Battery Radiator Inlet Hose Replacement . Is the repair complete?	Go to Step 39	Go to Step 1
32	Replace the drive motor battery radiator outlet hose. Refer to Drive Motor Battery Radiator Outlet Hose Replacement . Is the repair complete?	Go to Step 39	Go to Step 1
33	Replace the drive motor battery coolant cooler inlet hose. Refer to Drive Motor Battery Coolant Cooler Inlet Hose Replacement (4 Way Valve to Chiller) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Pump to Pipe) , Drive Motor Battery Coolant Cooler Inlet Hose Replacement (Radiator Surge Tank to Pipe) . Is the repair complete?	Go to Step 39	Go to Step 1
34	Replace the drive motor battery coolant cooler outlet hose. Refer to Drive Motor Battery Coolant Cooler Outlet Hose Replacement (Battery Outlet to Valve) . Is the repair complete?	Go to Step 39	Go to Step 1
35	Replace the drive motor battery coolant radiator replacement. Refer to Drive Motor Battery Coolant Radiator Replacement . Is the repair complete?	Go to Step 39	Go to Step 1
36	Replace the drive motor battery coolant pump. Refer to Drive Motor Battery Coolant Pump Replacement . Is the repair complete?	Go to Step 39	Go to Step 1
37	Replace the drive motor battery coolant pump inlet hose. Refer to Drive Motor Battery Coolant Pump Inlet Hose Replacement . Is the repair complete?	Go to Step 39	Go to Step 1
38	Replace the drive motor battery radiator surge tank. Refer to Drive Motor Battery Radiator Surge Tank Replacement . Is the repair complete?	Go to Step 39	Go to Step 1
39	Add coolant to the coolant surge tank as needed. Refer to Drive Motor Battery Cooling System Draining and Filling . Operate the system in order to verify the repair. Did you find and correct the condition?	System OK	Go to Step 1

WARNING
Refer to Moving Parts and Hot Surfaces Warning .

WARNING
Wear safety glasses in order to avoid eye damage.

Hybrid/EV Battery Cooling Diagnostic

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

A malfunctioning coolant pump may cause a battery pack overheat condition.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode.
Verify that DTC P0C43, P0C44, P0C45, P0CE0, P0CE2, P0CE3, P0D0A, P0D11, P1EBC, P1EC3, P1EC4, P1EC5, P1EC6, P1EC7, P1EC8, P1FFB, P1FFC, P1FFD, P1FFE, U0111, U185B, or U2602 is not set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
Verify the hybrid/EV battery pack coolant pump parameters listed below when commanding the hybrid/EV battery pack coolant pump between 20% and 90 % with a scan tool. Hybrid/EV Battery Pack Coolant Pump Command to be 10% or greater. Hybrid/EV Battery Pack Coolant Pump Feedback to be 50% +/-5%. Hybrid/EV Battery Pack Coolant Pump Speed is greater than 500 RPM. The scan tool parameters listed are not the specified ranges Refer to Circuit/System Testing. The scan tool parameters listed are within the specified ranges
All OK.

Vehicle OFF, disconnect the harness connector at the G37 Hybrid/EV Battery Pack Coolant Pump.
Test for less than 5 ohms between the ground circuit terminal 4 and ground. If 5 ohms or greater Repair the open/high resistance on the ground circuit. If less than 5 ohms
Vehicle in Service Mode.
Test for B+ between the B+ circuit terminal 5 and the ground circuit terminal 4. If less than B+ Vehicle OFF, test for infinite resistance between the B+ circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms and the fuse is blown, replace the G37 Hybrid/EV Battery Pack Coolant Pump. If B+
Connect a test lamp between the enable circuit terminal 1 and the ground circuit terminal 4.
Verify the test lamp turns ON and OFF when commanding the Hybrid Battery Pack Coolant Pump OFF (10 %) and ON (90 %) with a scan tool. If the test lamp is always illuminated at 10 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 1 V between the pump enable circuit terminal and ground. If 1 V or greater, repair the short to ground on the circuit. If less than 1 V, replace the K114B hybrid/EV powertrain control module 2. If the test lamp does not illuminate at 90 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the pump enable circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the pump enable circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp turns ON and OFF
Connect a test lamp between the control circuit terminal 3 and the B+ circuit terminal 5.
Verify that a test lamp changes illumination between bright (20 %) and dim (90 %) when command the Hybrid Battery Pack Coolant Pump ON between 20 % and 90 % with a scan tool. If the test lamp is always dim or does not illuminate Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp is always bright Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. The test lamp changes illumination between bright (20 %) and dim (90 %)
Remove the test lamp.
Verify the scan tool Hybrid Battery Pack Coolant Pump Feedback parameter is less than 10 %. If greater than 10 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the feedback circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. If 10 % or less
Install a 3 A fused jumper wire between the feedback circuit terminal 2 and the ground circuit terminal 4.
Verify the scan tool Hybrid Battery Pack Coolant Pump Feedback parameter is greater than 90 %. If 90 % or less Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for less than 1 V between the feedback circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If greater than 90 %
Replace the G37 Hybrid/EV Battery Pack Coolant Pump.

Perform the Diagnostic Repair Verification after completing the repair.

«Drive Motor Battery Coolant Pump Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

A malfunctioning cooling fan may cause a 14 V power module overheat condition.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode.
Verify the G38 14 V Power Module Fan speed increases and decreases when commanding the 14 V Power Module Fan Speed between 10 %-90 % with a scan tool. If the fan speed does not increase and decrease Refer to Circuit/System Testing. If the fan speed increases and decreases
Verify the G38 14 V Power Module Fan actual airflow increases and decreases when commanding the 14 V Power Module Fan Speed between 10 %-90 % with a scan tool. If the actual airflow does not increase and decrease Refer to Circuit/System Testing. If the actual airflow increases and decreases
All OK.

Vehicle OFF, disconnect the harness connector at the G38 14 V Power Module Cooling Fan.
Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
Vehicle in Service Mode.
Test for greater than B+ between the B+ circuit terminal 5 and the ground circuit terminal 1. If less than B+ Vehicle OFF, test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms and the fuse is blown, replace the G38 14 V Power Module Cooling Fan. If B+
Connect a test lamp between the enable circuit terminal 4 and ground circuit terminal 1.
Verify the test lamp turns OFF and ON when commanding the 14 V Power Module Fan Command OFF (10 %) and ON (90 %) with a scan tool. If the test lamp is always illuminated at 10 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the enable circuit and ground If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp does not illuminate at 90 % Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the enable circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the enable circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp turns ON and OFF
Connect a test lamp between the control circuit terminal 3 and the B+ circuit terminal 5.
Verify that a test lamp changes illumination between bright (10%) and dim (90%) when commanding the 14 V Power Module Fan ON between 10% and 90% with a scan tool. If the test lamp is always dim or does not illuminate Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Vehicle OFF. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If the test lamp is always bright Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. The test lamp changes illumination between bright (20 %) and dim (90 %)
Verify the scan tool 14 V Power Module Fan Feedback parameter is less than 10 %. If 10 % or greater Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Test for infinite resistance between the feedback circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2. If less than 10 %
Install a 3 A fused jumper wire between the feedback circuit terminal 2 and the B+ circuit terminal 5.
Verify the scan tool 14 V Power Module Fan Feedback is greater than 90 %. If 90 % or less Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the feedback circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Vehicle OFF. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid/EV Powertrain Control Module 2. If greater than 90 %
Replace the G38 14 V Power Module Cooling Fan.

Perform the Diagnostic Repair Verification after completing the repair.

«Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

A malfunctioning coolant pump may cause the a hybrid/EV electronics overheat condition.

Schematic Reference

Connector End View Reference

Description and Operation