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Hybrid Engine Controls - DTC B008A to DTC p0af7 Cadillac Escalade GMT900

Engine Control Systems ~12485 words

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit/System Description

The high voltage circuit impact detector sensor utilizes a unidirectional 2-wire circuit. The high voltage circuit impact detector sensor modulates current on the circuit interface to send ID, state of health, and deployment commands to the serial data gateway module. The serial data gateway module serves as a power source and a ground for the high voltage circuit impact detector sensor. When the ignition is turned ON and input power from the serial data gateway module is first detected, the high voltage circuit impact detector sensor responds by performing internal diagnostics and sending an ID to the serial data gateway module. The high voltage circuit impact detector sensor continually communicates status messages to the serial data gateway module. Some applications use multiple high voltage circuit impact detector sensors.

This vehicle does not use crash sensor 2 or 3. These DTCs can only set if the incorrect software is installed in the serial data gateway module.

Conditions for Running the DTC

  1. The ignition is ON.
  2. The battery voltage is 7.5-18 V.

B008A 00 or B008B 00

Sensor 2 or 3 is reporting a state-of-health message, but the serial data gateway module is not calibrated to use sensor 2 or 3.

Action Taken When the DTC Sets

The driver information center (DIC) displays the SERVICE HYBRID SYSTEM message.

Conditions for Clearing the DTC

  1. A current DTC clears when the malfunction is no longer present.
  2. The DIC message turns OFF when the DTC passes.
  3. A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Circuit/System Verification

Verify that DTC B008A or B008B is not set.

  1. If any of the DTCs are set, program the serial data gateway module. If any of the DTCs reset, replace the serial data gateway module.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for serial data gateway module replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalB009F 12B009F 39B009F 11B009F 73
Low ReferenceB009F 39B009F 73

Typical Scan Tool Data

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: No Crash
SignalSensing FailedSensing FailedSensing Failed
Low ReferenceNo CrashSensing Failed

Hybrid Crash Sensor 1

The high voltage circuit impact detector sensor utilizes a unidirectional 2-wire circuit. The high voltage circuit impact detector sensor modulates current on the circuit interface to send ID, state of health, and collision status to the serial data gateway module. The serial data gateway module serves as a power source and a ground for the high voltage circuit impact detector sensor. When the ignition is turned ON and input power from the serial data gateway module is first detected, the high voltage circuit impact detector sensor responds by performing internal diagnostics and sending an ID to the serial data gateway module. The high voltage circuit impact detector sensor continually communicates status messages to the serial data gateway module

  1. The ignition is ON.
  2. The battery voltage is 7.5-18 V.

B009F 00

The serial data gateway module is not programmed to use high voltage circuit impact detector sensor 1.

B009F 11

The high voltage circuit impact detector sensor signal circuit is shorted to voltage for 2.5 seconds.

B009F 12

The high voltage circuit impact detector sensor signal circuit is shorted to ground for 2.5 seconds.

B009F 39

The serial data gateway module has not received a valid state of health message from the high voltage circuit impact detector sensor for 2.5 seconds.

B009F 3A

The wrong high voltage circuit impact detector sensor has been installed.

B009F 4A

The serial data gateway module calibration does not match the vehicle configuration.

B009F 73

The serial data gateway module has received invalid serial data from the high voltage circuit impact detector sensor.

The driver information center (DIC) displays the SERVICE HYBRID SYSTEM message.

  1. A current DTC clears when the malfunction is no longer present.
  2. The DIC message turns OFF when the DTC passes.
  3. A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

  1. The high voltage circuit impact detector sensor has many different internal configurations in the same external package. Ensure that the correct sensor part number is installed with the correct software programmed in the serial data gateway module.
  2. Turn the ignition OFF for 1 minute before using a scan tool to clear the DTC from the serial data gateway module. If the ignition is not OFF for 1 minute, the DTC may not clear.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that DTC B009F 00, B009F 4A, or B009F 73 is not set. If the DTC is set, program the serial data gateway module. If the DTC resets, replace the serial data gateway module.
  2. Verify the serial data gateway module is programmed with the correct software calibration. If the correct software is not installed, program the serial data gateway module.
  3. Ignition ON, observe the scan tool Hybrid Crash Sensor 1 parameter. The reading should be No Crash. If not No Crash, refer to «Circuit/System Testing»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-dtc-b008a-to-dtc-p0af7__circuitsystem-testing) .

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the high voltage circuit impact detector sensor.
  2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the serial data gateway module.
  3. Connect a DMM, set on a manual setting that can read 12 V with the MIN/MAX function enabled, between the signal circuit terminal 1 and ground.
  4. Ignition ON, wait 10 seconds, The DMM reading should be less than 1.0 V. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the serial data gateway module.
  5. Verify the DMM MAX reading is greater than 6.0 V. If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the serial data gateway module.
  6. If all circuits test normal, test or replace the high voltage circuit impact detector sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «High Voltage Circuit Impact Detection Sensor Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-repair-instructions)
  2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for serial data gateway module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Run and Crank/On and Start Power CircuitB1453 06B1453 01

The Run and Crank/On and Start Power signal connects the Serial Data Gateway Module (SDGM) along with numerous other modules to the vehicle 12-volt system through a fused relay in the fuse block - underhood. This relay is closed by the Body Control Module (BCM) based on the key being in either the Run or Crank position.

Ignition voltage is between 9-16 volts.

B1453 01

Ignition is in ACC position.

B1453 06

Ignition is in RUN position.

Run and Crank/On and Start Power Circuit is more than 2.5 volts.

Run and Crank/On and Start Power Circuit is less than 2.5 volts.

DTC B1453 is a Type C DTC.

DTC B1453 is a Type C DTC.

Run and Crank/On and Start Power Circuit is less than 2.5 volts.

Run and Crank/On and Start Power Circuit is more than 2.5 volts.

Many controllers such as the power inverter module (PIM), transmission control module (TCM), and inflatable restraint sensing and diagnostic module (SDM) will set a DTC for a problem with the Run and Crank/On and Start Power Voltage circuit. Confirm that they do not have DTCs before only investigating the SDGM.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the SDGM harness connector X2 at the SDGM, verify that a test lamp does not illuminate between the ignition circuit terminal 20 and ground. If the test lamp illuminates, test the signal circuit terminal 20 for a short to voltage.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 20 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  3. If all circuits test normal, replace the SDGM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for SDGM replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid powertrain control module (HPCM) continuously monitors the system voltage on the Ignition voltage circuits. The HPCM is located within the drive motor generator power inverter module (PIM) assembly and is not serviced separately. Lower than normal voltage may be inadequate to operate the control module or sensors properly.

Ignition is in RUN/CRANK.

Conditions for Setting the DTC

The HPCM detects system voltage is 10 volts or less for 5 out of 6 seconds.

DTC P0562 is a Type C DTC.

DTC P0562 is a Type C DTC.

Observe the driver information center (DIC) messaging that would indicate the electrical system requires service.

Inspect for the following conditions

  1. Loose or damaged battery terminals.
  2. Loose or corroded connections at the drive motor generator power inverter module (PIM) assembly.
  3. Loose or corroded connections at the accessory dc power control module (APM).

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine ON, measure and record the battery voltage with a DMM. The battery voltage should be between 12.5-14.5 volts.

  1. If the voltage is not within the specified value, or the Charge Indicator light is ON, go to «DC Power Conversion Test»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-symptom-troubleshooting-diagnosis) .

Engine ON, the scan tool Control Module Voltage parameter should display between 12.5-14.5 volts.

  1. If the voltage is not within the specified value, test the Ignition Voltage circuit for an open, high resistance, or Short to Ground.
  2. If the voltage is within the specified range, replace the PIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM replacement, programming, and setup.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid powertrain control module (HPCM) continuously monitors the system voltage on the Ignition voltage circuits. The HPCM is located within the drive motor generator power inverter module (PIM) assembly and is not serviced separately. Higher than normal voltage may cause the control module or sensors to operate improperly.

Ignition is in RUN/CRANK.

The HPCM detects system voltage is 18 volts or greater for 5 out of 6 seconds.

DTC P0563 is a Type C DTC.

DTC P0563 is a Type C DTC.

  1. Observe the driver information center (DIC) messaging that would indicate the electrical system requires service.
  2. A battery charger may have set this DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine ON, measure and record the battery voltage with a DMM. The battery voltage should be less than 14.5 volts.

  1. If the voltage is not less than the specified value, or the Charge Indicator light is ON, go to «DC Power Conversion Test»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-symptom-troubleshooting-diagnosis) .
  1. Engine ON, the scan tool Control Module Voltage parameter should display less than 14.5 volts. If the voltage is not less than the specified value, test the Ignition Voltage circuit for a short to a voltage source greater than the specified value. If the voltage is within the specified range, replace the PIM.
  2. Inspect for an external condition that may have caused a high -12 V circuit condition such as a battery charger.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM replacement, programming, and setup.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

This is an internal fault detection of the power inverter module (PIM). This fault is handled inside the PIM and no external circuits are involved.

  1. The control module runs the program to detect an internal fault when the key is ON.
  2. Ignition voltage is 7V or greater.

The control module has detected an internal malfunction.

  1. DTCs P0601, P0602, P0603, P0604, P0606 and P062F are Type A DTCs.
  2. The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P0601, P0602, P0603, P0604, P0606 and P062F are Type A DTCs.

DTC Type Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
  1. Test for HPCM DTC P0562. Perform HPCM P0562 diagnosis if set.
  2. Clear the DTC information.
  3. Ignition OFF for 1 minute.
  4. Ignition ON.
  5. Retest for DTCs P0601, P0602, P0603, P0604, P0606 and P062F.
  1. Test for HPCM DTC P0562. Perform HPCM P0562 diagnosis if set.
  2. Program the PIM with the latest software version and recheck for DTCs. If the DTC resets after programming or if the PIM already contains the latest software version, replace the PIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM replacement, setup, and programming.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

This diagnostic applies to internal microprocessor integrity conditions within the hybrid powertrain control module (HPCM). The HPCM monitors its ability to read and write to the memory. The HPCM processor monitors the data to verify that the indicated torque calculation is correct. The HPCM is located within the drive motor generator power inverter module (PIM) and is not serviceable separately.

P061A

  1. Ignition voltage is 8-18V.
  2. Regenerative braking torque is greater than 0 N.m.

P061B

  1. Ignition voltage is 8-18V.
  2. Any output or brake torque is present.

P061A

The control module has detected the internal software calculation for regenerative braking torque has an error of greater than 100 N.m.

P061B

The control module has detected a torque calculation error.

  1. DTCs P061A and P061B are Type A DTCs.
  2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P061A and P061B are Type A DTCs.

DTC Type Reference

  1. Clear the DTC information.
  2. Ignition OFF for 1 minute.
  3. Ignition ON, start and drive the vehicle.
  4. Retest for DTCs P061A and P061B.

Program the PIM with the latest software version and recheck for DTCs.

  1. If the DTC resets after programming or if the PIM already contains the latest software version, replace the PIM.
  1. DTC P061B may set when Hybrid Battery power output is limited. A reduced hybrid battery power condition is most noticeable during high electrical loads such as Autostop to Autostart transitions. Inspect for hybrid battery DTCs or conditions that would reduce available hybrid battery power such as: Hybrid Battery Module undervoltage / P0AFA and various DTCs Hybrid Battery Module overvoltage / various DTCs Hybrid Battery Module voltage variation / P0AFA, P0BBD Hybrid Battery overtemperature / P0C32 Hybrid Battery exposure to extreme cold If any of the above DTCs are set or conditions are suspected, diagnose them prior to diagnosing this DTC.
  2. Program the PIM with the latest software version and recheck for DTCs. If the DTC resets after programming or if the PIM already contains the latest software version, replace the Hybrid Battery. If the DTC resets, replace the PIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PIM replacement, setup, and programming.
  2. «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) for Hybrid Battery replacement.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator power inverter module (PIM) contains two motor control modules (MCM) and a hybrid powertrain control module (HPCM). Each MCM utilizes a 5 Volt reference power supply for internal circuit needs. This fault is handled inside the PIM and no external circuits are involved.

  1. The control module runs the program to detect an internal fault when the key is ON.
  2. Ignition voltage is 8-18V.

The control module has detected an internal malfunction.

  1. DTCs P0642, P0643, P0652 and P0653 are Type A DTCs.
  2. The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P0642, P0643, P0652 and P0653 are Type A DTCs.

DTC Type Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
  1. Clear the DTC information.
  2. Ignition OFF for 1 minute.
  3. Ignition ON.
  4. Retest for DTCs P0642, P0643, P0652 and P0653.
  1. Clear the DTC and operate the vehicle under the condition for running and setting the DTC.
  2. Shut the ignition OFF for 30 seconds, and verify that the DTC does not reset. If the DTC resets, replace the Drive Motor Generator Power Inverter Module Assembly (PIM).

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM replacement, setup, and programming.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

This diagnostic applies to communication integrity conditions between the engine control module (ECM) and the hybrid powertrain control module (HPCM). The HPCM monitors a state of health message that the ECM transmits to verify the ECM is functioning properly.

Ignition voltage is 8-18V.

The HPCM does not detect a valid state of health message from the ECM.

  1. DTC P06AF is a Type A DTC.
  2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P06AF is a Type A DTC.

DTC Type Reference

  1. Clear the DTC information.
  2. Ignition OFF for 1 minute.
  3. Ignition ON.
  4. Retest for DTC P06AF, ECM DTC P0606, or any communication DTCs.
  1. Ignition ON, inspect for ECM DTC P0606, ECM DTC P0A1D, or any U-code communication DTCs. If the specified DTCs are set, repair them first. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Ignition OFF, disconnect the ECM connector X3 and the PIM connector X1.
  3. Test for less than 1 ohm resistance on the GMLAN serial data circuits between the ECM and the PIM. If greater than the specified range, repair the GMLAN serial data circuit for an open/high resistance condition. If within the specified range, inspect the ECM and PIM connectors for proper terminal contact. Repair as necessary.
  4. Ensure the ECM contains the latest software version. Program as necessary.
  5. Ignition ON, inspect for ECM DTC P0606 or any U-code communication DTCs. If the specified DTCs are set, repair them first. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If only P06AF has reset, replace the ECM and continue with diagnosis.
  6. Ensure the PIM contains the latest software version. Program as necessary.
  7. Ignition ON, inspect for ECM DTC P0606 or any U-code communication DTCs. If the specified DTCs are set, repair them first. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If only P06AF has reset, replace the PIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM or PIM replacement, setup, and programming.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator power inverter module (PIM) contains two motor control modules (MCM) and a hybrid powertrain control module (HPCM). The MCMs share an internal 15 volt reference power supply in order to operate the drive motor sensors processors. This fault is handled inside the PIM and no external circuits are involved.

  1. The control module runs the program to detect an internal fault when the key is ON.
  2. Ignition voltage is 8-18V.

P06B1 or P06B4

The reference voltage is less than 12 V for 1 second.

P06B2 or P06B5

The reference voltage is greater than 18 V for 1 second.

  1. DTCs P06B1, P06B2, P06B4 and P06B5 are Type B DTCs.
  2. The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P06B1, P06B2, P06B4 and P06B5 are Type B DTCs.

DTC Type Reference

  1. Clear the DTC information.
  2. Turn the ignition OFF for 1 minute.
  3. Turn the ignition ON.
  4. Retest for DTCs P06B1, P06B2, P06B4 and P06B5.
  1. Clear the DTC and operate the vehicle under the condition for running and setting the DTC.
  2. Shut the ignition OFF for 30 seconds, and verify that the DTC does not reset. If the DTC resets, replace the PIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM replacement, setup, and programming.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator power inverter control module (PIM) contains several microprocessors. This diagnostic applies to internal microprocessor integrity conditions within the hybrid powertrain control module (HPCM). The HPCM and each Motor Control Module (MCM) utilize a programmable logic device (PLD) to perform certain input and output functions. At ignition ON, the PLD expects to communicate with the HPCM and both MCMs. The PLD will communicate to MCM 1 over an internal communication circuit when it has established communications with the HPCM. MCM 1 will communicate to the engine control module (ECM) over GMLAN if the PLD has not established communication with the HPCM.

  1. The control module runs the program to detect an internal fault when the key is ON.
  2. Ignition voltage is 8-18 volts.

The control module has detected an internal HPCM malfunction.

DTC P0A1D is a Type A DTC.

DTC P0A1D is a Type A DTC.

An intermittent loss of battery power to the drive motor generator power inverter module assembly (PIM) may set this DTC.

DTC Type Reference

  1. Clear the DTC information.
  2. Turn the ignition OFF for 1 minute.
  3. Turn the ignition ON.
  4. Retest for DTC P0A1D.
  1. Inspect for any communication U-code DTCs. If the specified DTCs are set, repair them first. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Ignition OFF, disconnect the 12V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
  3. Wait 2 minutes.
  4. Reconnect the 12V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
  5. Ignition ON, retest for DTC P0A1D. If the DTC resets, program the PIM with the latest software version and recheck for DTCs. If the DTC resets after programming or if the PIM already contains the latest software version, replace the PIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM replacement, setup, and programming.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

This is a fault detection of the Drive Motor Generator Power Inverter Modules' (PIM) internal Motor Control Module (MCM). This fault is handled inside the PIM and no external circuits are involved. The MCMs are located within the PIM and are not serviced separately.

  1. The control module runs the program to detect an internal fault when the ignition is ON.
  2. Ignition voltage is 8-18V.

The control module has detected an internal malfunction.

  1. DTCs P0A1B and P0A1C are Type A DTCs.
  2. The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P0A1B and P0A1C are Type A DTCs.

DTC Type Reference

  1. Clear the DTC information.
  2. Ignition OFF for 1 minute.
  3. Ignition ON.
  4. Retest for DTCs P0A1B and P0A1C.

Program the PIM with the latest software version and recheck for DTCs.

  1. If the DTC resets after programming or if the PIM already contains the latest software version, replace the PIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM replacement, setup, and programming.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Motor Temperature Sensor SignalP0A2C, P0A32P0A2D, P0A33P0A2D, P0A33P0A2B, P0A31
Motor Temperature Sensor Low ReferenceP0A2D, P0A33P0A2B, P0A31
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Ignition ON Parameter Normal Range: 0.29V to 4.43V
Motor Temperature Signal0.00V4.45VSensor Damage Possible
Motor Temperature Sensor Low Reference4.45V

MCM Motor 1/2 Temperature Sensor

The motor temperature sensor (MTS) is a non-serviceable part of the drive motor generator assembly. The MTS sensor is a thermistor, or a resistor that changes value when the temperature changes. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The motor control module (MCM) supplies about a 5-volt reference signal to the sensor and measures the voltage drop in the circuit. When the motor is cold, the sensor resistance is high and the MCM detects high signal voltage. As the motor temperature increases, the resistance of the sensor decreases, which lowers the signal voltage.

P0A2B and P0A31

  1. DTCs P0A2C, P0A2D, P0AEF, P0AF0, P0BD3, P0BD4, P0BDD, P0BDE are not set.
  2. Ignition ON after the engine has been OFF for at least 6 hours.
  3. Average of phase U, V, W inverter temperatures is greater than -12°C (+10°F).
  4. Motor temperature is greater than -40°C (-40°F).

P0A2C, P0A2D, P0A32 and P0A33

The ignition is ON.

  1. The average of the three motor phase sensor temperatures and the motor temperature are not within 28°C (50°F) of each other at ignition ON.
  2. The DTC sets within 3 seconds when the above condition is met.

P0A2C and P0A32

  1. Motor temperature sensor signal is less than 0.29V.
  2. The DTC sets within 3 seconds when the above condition is met.

P0A2D and P0A33

Motor temperature sensor signal is greater than 4.42V.

  1. If this condition is observed at Ignition ON, the drive motor generator must operate at greater than 20 N.m (14.75 lb ft) of torque for a cumulative time of 1.5 minutes before the DTC will set.
  2. If this condition is observed after Ignition ON, the DTC will set within 3 seconds when the above condition is met.
  1. DTCs P0A2B-P0A2D, P0A31-P0A33 are Type B DTCs.
  2. The HPCM commands the SERVICE HYBRID SYSTEM message to display on the instrument panel.

DTCs P0A2B-P0A2D, P0A31-P0A33 are Type B DTCs.

  1. The motor temperature sensor can be damaged by excessive electric current. Test the sensor for an open condition whenever a short to voltage condition is observed.
  2. Test the X176 transmission 24-way connector for proper terminal contact whenever an open or high resistance circuit condition is observed.
  3. The HPCM motor temperature scan tool parameter display will default to 120°C (248°F) whenever an open or shorted signal circuit is observed.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#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

DT-48493 Jumper Harness, 24 terminal. See Special Tools .

  1. Allow the vehicle to cool to ambient temperature by leaving the ignition OFF for 6 or more hours.
  2. Ignition ON, observe Motor 1 temperature, Motor 2 temperature, and phase U, V, W inverter temperature scan tool parameters. The Motor 1 Temperature, Motor 2 Temperature, and phase U, V, W inverter temperature parameters should be within 28°C (50°F) of each other and ambient temperature.

Ignition ON, observe the MCM motor temperature scan tool parameter.

  1. The motor temperature parameter should be between 0.29V and 4.42V.
  1. Ignition OFF, disconnect the transmission X176 24-way harness connector.
  2. Ignition ON, test the vehicle harness side for less than 8 ohms between the low reference circuit terminal and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PIM.
  3. Ignition ON, verify the scan tool motor temperature sensor parameter is greater than 4.42V. If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the PIM.
  4. Install a 3-amp fused jumper wire between the signal circuit terminal and the low reference circuit terminal. Verify the scan tool motor temperature sensor parameter is less than 0.29V. IMPORTANT: If a short to voltage is found, test the motor temperature sensor for damage. If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PIM.
  5. Connect the DT-48493 to the X176 transmission 24-way connector at the transmission. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . Measure and record the resistance between the sensor signal and low reference terminals. Compare the actual sensor and circuit resistance to the expected sensor resistance. Refer to «Temperature Versus Resistance»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-specifications__temperature-versus-resistance) . If the resistance is near the expected value, test the transmission internal harness signal circuit for a short to ground. If the circuit tests normal, replace the drive motor w/generator. If the resistance is not near the expected value, test the transmission internal harness signal and low reference circuits for an open or shorted together condition. If the circuits test normal, replace the drive motor w/generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PIM replacement, setup, and programming
  2. «Transmission Control Wiring Harness Extension Harness Removal»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  3. «Drive Motor with Generator Assembly Removal - 1st Position»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  4. «Drive Motor with Generator Assembly Removal - 2nd Position»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The transmission contains two electric motor generators. The drive motor generators are cooled by the transmission fluid. Hot fluid exits the drive motor generator housing and flows to the transmission cooler supply line. The supply line connects to the cooler. From the cooler, the fluid returns through the oil cooler return line and enters the lubrication circuits. After lubricating the internal components, the fluid returns to the oil pan. A non-serviceable motor temperature sensor (MTS) is located in each drive motor generator assembly.

DTC P0A2B is not set.

The MTS is greater than 200°C (392°F) for 3 seconds and has not fallen below 135°C (275°F).

  1. DTC P0A2F is a Type B DTC.
  2. The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P0A2F is a Type B DTC.

  1. The driver information center (DIC), if equipped, will display 'TRANSMISSION HOT- Idle Engine' when the transmission fluid temperature (TFT) is more than 132°C (270°F) for 10 minutes.
  2. Ask about the customer's driving habits, trailer towing, etc.
  3. Ensure the engine cooling system is functioning normally.
  4. The HPCM will reduce drive motor generator torque at temperatures greater than 160°C (320°F). Drive motor generator torque is reduced to zero if the temperature reaches 190°C (374°F).

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Review the Failure Records when the DTC set. If the engine coolant temperature (ECT) was above 125°C (257°F) when the DTC set, go to «Symptoms - Engine Cooling»(/cadillac/escalade/gmt900-2006-2014/remont/cooling-system-mechanical/#engine-cooling-system) and correct that concern first.
  2. Perform the «Transmission Fluid Cooler Flushing and Flow Test (J 45096)»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis__transmission-fluid-cooler-flushing-and-flow) .
  1. Review the Failure Records when the DTC set.
  2. Compare the MTS values for each drive motor generator. If both MTS values were not at or near 200°C (392°F), test the MTS signal circuit for a low resistance to ground condition. If the circuit tests normal, replace the drive motor generator.
  3. Inspect the transmission cooling system for restrictions or damage. If a concern is found, repair or replace the restricted or damaged components as necessary.
  4. Perform the «Transmission Fluid Cooler Flushing and Flow Test (J 45096)»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis__transmission-fluid-cooler-flushing-and-flow) . If a concern is found, repair or replace the damaged components as necessary.
  5. Perform the automatic transmission «Line Pressure Check»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis__line-pressure-check) . If a concern is found repair or replace the damaged components as necessary.

Component Testing

  1. Perform the «Fluid Leak Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis) .
  2. Perform the «Transmission Fluid Level and Condition Check»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis__transmission-fluid-level-and-condition-check) procedure.
  3. Perform the «Line Pressure Check»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis__line-pressure-check) procedure.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Drive Motor with Generator Assembly Removal - 1st Position»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle) .
  2. «Transmission Control Wiring Harness Extension Harness Removal»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The transmission contains two electric motor generators. The drive motor generators are cooled by the transmission fluid. Hot fluid exits the drive motor generator housing and flows to the transmission cooler supply line. The supply line connects to the cooler. From the cooler, the fluid returns through the oil cooler return line and enters the lubrication circuits. After lubricating the internal components, the fluid returns to the oil pan. A non-serviceable motor temperature sensor (MTS) is located in each drive motor generator assembly.

DTC P0A31 is not set.

The MTS is greater than 200°C (392°F) for 3 seconds, and has not fallen below 135°C (275°F).

  1. DTC P0A35 is a Type B DTC.
  2. The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P0A35 is a Type B DTC.

  1. The driver information center (DIC), if equipped, will display 'TRANSMISSION HOT- Idle Engine' when the transmission fluid temperature (TFT) is more than 132°C (270°F) for 10 minutes.
  2. Ask about the customer's driving habits, trailer towing, etc.
  3. Ensure the engine cooling system is functioning normally.
  4. The HPCM will reduce drive motor generator torque at temperatures greater than 160°C (320°F). Drive motor generator torque is reduced to zero if the temperature reaches 190°C (374°F).

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Review the Failure Records when the DTC set. If the engine coolant temperature (ECT) was above 125°C (257°F) when the DTC set, go to «Symptoms - Engine Cooling»(/cadillac/escalade/gmt900-2006-2014/remont/cooling-system-mechanical/#engine-cooling-system) and correct that concern first.
  2. Perform the «Transmission Fluid Cooler Flushing and Flow Test (J 45096)»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis__transmission-fluid-cooler-flushing-and-flow) .
  1. Review the Failure Records when the DTC set.
  2. Compare the MTS values for each drive motor generator. If both MTS values were not at or near 200°C (392°F), test the MTS signal circuit for a low resistance to ground condition. If the circuit tests normal, replace the motor temperature sensor.
  3. Inspect the transmission cooling system for restrictions or damage. If a concern is found, repair or replace the restricted or damaged components as necessary.
  4. Perform the «Transmission Fluid Cooler Flushing and Flow Test (J 45096)»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis__transmission-fluid-cooler-flushing-and-flow) . If a concern is found, repair or replace the damaged components as necessary.
  5. Perform the automatic transmission «Line Pressure Check»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis__line-pressure-check) . If a concern is found repair or replace the damaged components as necessary.
  1. Perform the «Fluid Leak Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis) .
  2. Perform the «Transmission Fluid Level and Condition Check»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis__transmission-fluid-level-and-condition-check) procedure.
  3. Perform the «Line Pressure Check»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-symptom-troubleshooting-diagnosis__line-pressure-check) procedure.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Drive Motor with Generator Assembly Removal - 2nd Position»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle) .
  2. «Transmission Control Wiring Harness Extension Harness Removal»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Drive Motor Generator 1 Position Sensor S1P0C52P0A3FP0C53, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S3P0C52P0A3FP0C53, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S2P0C5CP0A3FP0C5D, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S4P0C5CP0A3FP0C5D, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor Excitation PositiveP0A3FP0A3FP0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor Excitation NegativeP0A3FP0A3FP0A3FP1B03, P0A40

Drive Motor Generator 1

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Drive Motor Generator 2 Position Sensor S1P0A45, P0C57P0A45P0C58, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S3P0A45, P0C57P0A45P0C58, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S2P0A45, P0C61P0A45P0C62, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S4P0A45, P0C61P0A45P0C62, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor Excitation PositiveP0A45P0A45P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor Excitation NegativeP0A45P0A45P0A45P1B04, P0A46

Drive Motor Generator 2

The drive motor generator position sensor is monitored by the motor control module (MCM). The MCM monitors the angular position, speed and direction of the drive motor generator based upon the signals of the resolver-type position sensor. The position sensor, or resolver, contains a drive coil, two driven coils and an irregular shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the drive motor generator. At ignition ON, the MCM outputs a 7 volt ac, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular shaped rotor. The MCM then monitors the two driven coil circuits for a return signal. The position of the irregular shaped metallic rotor causes the magnetically-induced return signals of the driven coils to vary in size and shape. A comparison of the two driven coil signals allows the MCM to determine the exact position, speed and direction of the drive motor generator. The position sensor is a non-serviceable part of the drive motor generator.

The ignition is ON.

The MCM cannot determine the motor position based upon the sensor signals.

  1. P0A3F is a Type A DTC.
  2. The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor relays.

P0A3F is a Type A DTC.

  1. The drive motor generator position sensor circuits operate at very low current. Extreme care must be taken when probing terminals and manipulating harnesses.
  2. The sensor circuit loops are twisted pair with each pair covered in a foil shield. The shield circuits outside of the transmission are grounded to a stud on the drive motor generator power inverter module (PIM) assembly.
  3. Ensure the drive motor generator position sensor harness shield circuits are properly grounded prior to testing.

Schematic Reference

Connector End View Reference

  1. «Component Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index-a)
  2. «Inline Harness Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Special Tools

DT-48493 Jumper Harness. See Special Tools .

  1. Ignition OFF, disconnect PIM X1 connector.
  2. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the PIM X1 circuits as indicated. Also test each circuit for a short to ground. If any of the circuits are not within specification, continue with testing. If all circuits test normal, inspect for proper terminal contact at PIM X1 connector. If PIM X1 terminal contact tests OK, perform the Intermittent Condition Testing below.
  3. Disconnect the transmission X176 24-way connector.
  4. Connect the DT-48493 to the X176 24-way connector at the transmission. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  5. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the transmission X176 circuits as indicated. Also test each circuit for a short to ground. If all circuits test normal, continue with testing. If any of the circuits are not within specification, test the internal transmission harness for the condition. If the internal transmission harness tests OK, replace the applicable drive motor generator.
  6. Disconnect DT-48493 from the transmission X176 24-way connector. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  7. Connect the DT-48493 to the transmission X176 24-way connector at the vehicle harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  8. Disconnect PIM X1 connector.
  9. Using the PIM to Transmission Terminal Reference table listed below, test the vehicle harness continuity between PIM X1 connector and transmission X176 connector. Also test these circuits for short to ground and to the shield circuit if the shield circuit is not presently grounded to the PIM assembly. If any of the circuits are not within the specified range, repair the wiring harness. If all circuits test normal, inspect transmission connector X176 for proper terminal contact. If transmission connector X176 tests OK, inspect the harness for an intermittent concern.

Intermittent Condition Testing

  1. If possible, determine which of the position sensor circuits have the intermittent condition by reviewing the Diagnostic Fault Information table. For example, DTCs P0C57 and P0C52 only set for a short to ground condition on either the S1 or S3 circuit.
  2. Using the Position Sensor Specification table listed below, monitor the position sensor circuits at PIM X1 connector while manipulating the applicable harness and connectors. If any of the circuits are not within specification, repair the harness or terminal as required. If a harness repair is indicated and external harness damage is not evident, the most likely location for internal wire damage is near the harness clamping locations.
  3. Disconnect transmission X176 connector and inspect for the following: Proper terminal contact Proper terminal retention in the connector Foreign material or moisture Repair, replace or clean the connector as appropriate.
  4. Reconnect all connectors and test drive the vehicle. If the DTC sets, replace the applicable drive motor generator and retest for DTCs. If the DTC sets, replace the PIM.
When Testing at PIM X1 56-way Connector/TerminalWhen Testing at Transmission X176 24-way Connector/TerminalMinimum ResistanceMaximum Resistance
Use the DT-48493 to test at X176. See Special Tools .
55-568-97.0 ohms9.0 ohms
53-5410-1123 ohms26 ohms
51-5212-1420 ohms23 ohms
52-568-12Over 1 M ohm
54-568-10Over 1 M ohm
52-5410-12Over 1 M ohm

Position Sensor Specification

PIM Connector X1/TerminalTransmission X176 24-Way Connector/TerminalMinimum ResistanceMaximum Resistance
Harness Continuity Test
568Less than 1 ohm
559Less than 1 ohm
5410Less than 1 ohm
5311Less than 1 ohm
5212Less than 1 ohm
5114Less than 1 ohm

PIM to Transmission Terminal Reference

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PIM replacement, setup and programming
  2. «Drive Motor with Generator Assembly Removal - 1st Position»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  3. «Transmission Control Wiring Harness Extension Harness Removal»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Drive Motor Generator 1 Position Sensor S1P0C52P0A3FP0C53, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S3P0C52P0A3FP0C53, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S2P0C5CP0A3FP0C5D, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S4P0C5CP0A3FP0C5D, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor Excitation PositiveP0A3FP0A3FP0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor Excitation NegativeP0A3FP0A3FP0A3FP1B03, P0A40

Drive Motor Generator 1

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Drive Motor Generator 2 Position Sensor S1P0A45, P0C57P0A45P0C58, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S3P0A45, P0C57P0A45P0C58, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S2P0A45, P0C61P0A45P0C62, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S4P0A45, P0C61P0A45P0C62, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor Excitation PositiveP0A45P0A45P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor Excitation NegativeP0A45P0A45P0A45P1B04, P0A46

Drive Motor Generator 2

The drive motor generator position sensor is monitored by the motor control module (MCM). The MCM monitors the angular position, speed and direction of the drive motor generator based upon the signals of the resolver-type position sensor. The position sensor, or resolver, contains a drive coil, two driven coils and an irregular shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the drive motor generator. At ignition ON, the MCM outputs a 7 volt ac, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular shaped rotor. The MCM then monitors the two driven coil circuits for a return signal. The position of the irregular shaped metallic rotor causes the magnetically-induced return signals of the driven coils to vary in size and shape. A comparison of the two driven coil signals allows the MCM to determine the exact position, speed and direction of the drive motor generator. The position sensor is a non-serviceable part of the drive motor generator.

The ignition is ON.

The MCM detects a degraded motor position sensor signal.

  1. DTC P0A40 is a Type A DTC.
  2. The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P0A40 is a Type A DTC.

  1. The drive motor generator position sensor circuits operate at very low current. Extreme care must be taken when probing terminals and manipulating harnesses.
  2. The sensor circuit loops are twisted pair with each pair covered in a foil shield. The shield circuits outside of the transmission are grounded to a stud on the drive motor generator power inverter module (PIM) assembly.
  3. Ensure the drive motor generator position sensor harness shield circuits are properly grounded prior to testing.

Schematic Reference

Connector End View Reference

  1. «Component Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index-a)
  2. «Inline Harness Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Special Tools

DT-48493 Jumper Harness. See Special Tools .

  1. Ignition OFF, disconnect PIM X1 connector.
  2. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the PIM X1 circuits as indicated. Also test each circuit for a short to ground. If any of the circuits are not within specification, continue with testing. If all circuits test normal, inspect for proper terminal contact at PIM X1 connector. If PIM X1 terminal contact tests OK, perform the Intermittent Condition Testing below.
  3. Disconnect the transmission X176 24-way connector.
  4. Connect the DT-48493 to the X176 24-way connector at the transmission. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  5. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the transmission X176 circuits as indicated. Also test each circuit for a short to ground. If all circuits test normal, continue with testing. If any of the circuits are not within specification, test the internal transmission harness for the condition. If the internal transmission harness tests OK, replace the applicable drive motor generator.
  6. Disconnect DT-48493 from the transmission X176 24-way connector. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  7. Connect the DT-48493 to the transmission X176 24-way connector at the vehicle harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  8. Disconnect PIM X1 connector.
  9. Using the PIM to Transmission Terminal Reference table listed below, test the vehicle harness continuity between PIM X1 connector and transmission X176. Also test these circuits for short to ground and to the shield circuit if the shield circuit is not presently grounded to the PIM assembly. If any of the circuits are not within the specified range, repair or replace the wiring harness. If all circuits test normal, inspect transmission connector X176 for proper terminal contact. If transmission connector X176 tests OK, inspect the harness for an intermittent concern.
  1. If possible, determine which of the position sensor circuits have the intermittent condition by reviewing the Diagnostic Fault Information table. For example, DTCs P0C57 and P0C52 only set for a short to ground condition on either the S1 or S3 circuit.
  2. Using the Position Sensor Specification table listed below, monitor the position sensor circuits at PIM X1 connector while manipulating the applicable harness and connectors. If any of the circuits are not within specification, repair the harness or terminal as required. If a harness repair is indicated and external harness damage is not evident, the most likely location for internal wire damage is near the harness clamping locations.
  3. Disconnect transmission X176 connector and inspect for the following: Proper terminal contact Proper terminal retention in the connector Foreign material or moisture Repair, replace or clean the connector as appropriate.
  4. Reconnect all connectors and test drive the vehicle. If the DTC sets, replace the applicable drive motor generator and retest for DTCs. If the DTC sets, replace the PIM.
When Testing at PIM X1 56-way Connector/TerminalWhen Testing at Transmission X176 24-way Connector/TerminalMinimum ResistanceMaximum Resistance
Use the DT-48493 to test at X176. See Special Tools .
55-568-97.0 ohms9.0 ohms
53-5410-1123 ohms26 ohms
51-5212-1420 ohms23 ohms
52-568-12Over 1 M ohm
54-568-10Over 1 M ohm
52-5410-12Over 1 M ohm

Position Sensor Specification

PIM Connector X1 56-Way Connector/TerminalTransmission X176 24-Way /TerminalMinimum ResistanceMaximum Resistance
Harness Continuity Test
568Less than 1 ohm
559Less than 1 ohm
5410Less than 1 ohm
5311Less than 1 ohm
5212Less than 1 ohm
5114Less than 1 ohm

PIM to Transmission Terminal Reference

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PIM replacement, setup and programming
  2. «Drive Motor with Generator Assembly Removal - 1st Position»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  3. «Transmission Control Wiring Harness Extension Harness Removal»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Drive Motor Generator 1 Position Sensor S1P0C52P0A3FP0C53, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S3P0C52P0A3FP0C53, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S2P0C5CP0A3FP0C5D, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S4P0C5CP0A3FP0C5D, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor Excitation PositiveP0A3FP0A3FP0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor Excitation NegativeP0A3FP0A3FP0A3FP1B03, P0A40

Drive Motor Generator 1

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Drive Motor Generator 2 Position Sensor S1P0A45, P0C57P0A45P0C58, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S3P0A45, P0C57P0A45P0C58, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S2P0A45, P0C61P0A45P0C62, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S4P0A45, P0C61P0A45P0C62, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor Excitation PositiveP0A45P0A45P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor Excitation NegativeP0A45P0A45P0A45P1B04, P0A46

Drive Motor Generator 2

The drive motor generator position sensor is monitored by the motor control module (MCM). The MCM monitors the angular position, speed and direction of the drive motor generator based upon the signals of the resolver-type position sensor. The position sensor, or resolver, contains a drive coil, two driven coils and an irregular shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the drive motor generator. At ignition ON, the MCM outputs a 7 volt ac, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular shaped rotor. The MCM then monitors the two driven coil circuits for a return signal. The position of the irregular metallic rotor causes the magnetically-induced return signals of the driven coils to vary in size and shape. A comparison of the two driven coils signals allows the MCM to determine the exact position, speed and direction of the drive motor generator. The position sensor is a non-serviceable part of the drive motor generator.

The ignition is ON.

The MCM cannot determine the motor position based upon the sensor signals.

  1. DTC P0A45 is a Type A DTC.
  2. The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P0A45 is a Type A DTC.

  1. The drive motor generator position sensor circuits operate at very low current. Extreme care must be taken when probing terminals and manipulating harnesses.
  2. The sensor circuit loops are twisted pair with each pair covered in a foil shield. The shield circuits outside of the transmission are grounded to a stud on the drive motor generator power inverter module (PIM) assembly.
  3. Ensure the drive motor generator position sensor harness shield circuits are properly grounded prior to testing.

Schematic Reference

Connector End View Reference

  1. «Component Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index-a)
  2. «Inline Harness Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Special Tools

DT-48493 Jumper Harness. See Special Tools .

  1. Ignition OFF, disconnect PIM X1 connector.
  2. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the PIM X1 circuits as indicated. Also test each circuit for a short to ground. If any of the circuits are not within specification, continue with testing. If all circuits test normal, inspect for proper terminal contact at PIM X1 connector. If PIM X1 terminal contact tests OK, perform the Intermittent Condition Testing below.
  3. Disconnect the transmission X176 24-way connector.
  4. Connect the DT-48493 to the X176 24-way connector at the transmission. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  5. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the transmission X176 circuits as indicated. Also test each circuit for a short to ground. If all circuits test normal, continue with testing. If any of the circuits are not within specification, test the internal transmission harness for the condition. If the internal transmission harness tests OK, replace the applicable drive motor generator.
  6. Disconnect DT-48493 from the transmission X176 24-way connector. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  7. Connect the DT-48493 to the transmission X176 24-way connector at the vehicle harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  8. Disconnect PIM X1 connector.
  9. Using the PIM to Transmission Terminal Reference table listed below, test the vehicle harness continuity between PIM X1 connector and transmission X176 connector. Also test these circuits for short to ground and to the shield circuit if the shield circuit is not presently grounded to the PIM assembly. If any of the circuits are not within the specified range, repair or replace the wiring harness. If all circuits test normal, inspect transmission connector X176 for proper terminal contact. If transmission connector X176 tests OK, inspect the harness for an intermittent concern.
  1. If possible, determine which of the position sensor circuits have the intermittent condition by reviewing the Diagnostic Fault Information table. For example, DTCs P0C57 and P0C52 only set for a short to ground condition on either the S1 or S3 circuit.
  2. Using the Position Sensor Specification table listed below, monitor the position sensor circuits at PIM X1 connector while manipulating the applicable harness and connectors. If any of the circuits are not within specification, repair the harness or terminal as required. If a harness repair is indicated and external harness damage is not evident, the most likely location for internal wire damage is near the harness clamping locations.
  3. Disconnect transmission X176 connector and inspect for the following: Proper terminal contact Proper terminal retention in the connector Foreign material or moisture Repair, replace or clean the connector as appropriate.
  4. Reconnect all connectors and test drive the vehicle. If the DTC sets, replace the applicable drive motor generator and retest for DTCs. If the DTC sets, replace the PIM.
When Testing at PIM X1 56-way Connector/TerminalWhen Testing at Transmission X176 24-way Connector/TerminalMinimum ResistanceMaximum Resistance
Use the DT-48493 to test at X176. See Special Tools .
48-4915-167.0 ohms9.0 ohms
46-4717-1823 ohms26 ohms
44-4520-2120 ohms23 ohms
45-4915-20Over 1 M ohm
47-4915-17Over 1 M ohm
45-4717-20Over 1 M ohm

Position Sensor Specification

PIM Connector X1 56-Way Connector/TerminalTransmission X176 24-Way /TerminalMinimum ResistanceMaximum Resistance
Harness Continuity Test
4915Less than 1 ohm
4816Less than 1 ohm
4717Less than 1 ohm
4618Less than 1 ohm
4520Less than 1 ohm
4421Less than 1 ohm

PIM to Transmission Terminal Reference

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PIM replacement, setup and programming
  2. «Drive Motor with Generator Assembly Removal - 2nd Position»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  3. «Transmission Control Wiring Harness Extension Harness Removal»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Drive Motor Generator 1 Position Sensor S1P0C52P0A3FP0C53, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S3P0C52P0A3FP0C53, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S2P0C5CP0A3FP0C5D, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor S4P0C5CP0A3FP0C5D, P0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor Excitation PositiveP0A3FP0A3FP0A3FP1B03, P0A40
Drive Motor Generator 1 Position Sensor Excitation NegativeP0A3FP0A3FP0A3FP1B03, P0A40

Drive Motor Generator 1

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Drive Motor Generator 2 Position Sensor S1P0A45, P0C57P0A45P0C58, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S3P0A45, P0C57P0A45P0C58, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S2P0A45, P0C61P0A45P0C62, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor S4P0A45, P0C61P0A45P0C62, P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor Excitation PositiveP0A45P0A45P0A45P1B04, P0A46
Drive Motor Generator 2 Position Sensor Excitation NegativeP0A45P0A45P0A45P1B04, P0A46

Drive Motor Generator 2

The drive motor generator position sensor is monitored by the motor control module (MCM). The MCM monitors the angular position, speed and direction of the drive motor generator based upon the signals of the resolver-type position sensor. The position sensor, or resolver, contains a drive coil, two driven coils and an irregular shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the drive motor generator. At ignition ON, the MCM outputs a 7 volt ac, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular shaped rotor. The MCM then monitors the two driven coil circuits for a return signal. The position of the irregular metallic rotor causes the magnetically-induced return signals of the driven coils to vary in size and shape. A comparison of the two driven coil signals allows the MCM to determine the exact position, speed and direction of the drive motor generator. The position sensor is a non-serviceable part of the drive motor generator.

The ignition is ON.

The MCM detects a degraded motor position sensor signal.

  1. DTC P0A46 is a Type A DTC.
  2. The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P0A46 is a Type A DTC.

  1. The drive motor generator position sensor circuits operate at very low current. Extreme care must be taken when probing terminals and manipulating harnesses.
  2. The sensor circuit loops are twisted pair with each pair covered in a foil shield. The shield circuits outside of the transmission are grounded to a stud on the drive motor generator power inverter module (PIM) assembly.
  3. Ensure the drive motor generator position sensor harness shield circuits are properly grounded prior to testing.

Schematic Reference

Connector End View Reference

  1. «Component Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index-a)
  2. «Inline Harness Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Special Tools

DT-48493 Jumper Harness. See Special Tools .

  1. Ignition OFF, disconnect PIM X1 connector.
  2. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the PIM X1 circuits as indicated. Also test each circuit for a short to ground. If any of the circuits are not within specification, continue with testing. If all circuits test normal, inspect for proper terminal contact at PIM X1 connector. If PIM X1 terminal contact tests OK, perform the Intermittent Condition Testing below.
  3. Disconnect the transmission X176 24-way connector.
  4. Connect the DT-48493 to the X176 24-way connector at the transmission. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  5. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the transmission X176 circuits as indicated. Also test each circuit for a short to ground. If all circuits test normal, continue with testing. If any of the circuits are not within specification, test the internal transmission harness for the condition. If the internal transmission harness tests OK, replace the applicable drive motor generator.
  6. Disconnect DT-48493 from the transmission X176 24-way connector. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  7. Connect the DT-48493 to the transmission X176 24-way connector at the vehicle harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
  8. Disconnect PIM X1 connector.
  9. Using the PIM to Transmission Terminal Reference table listed below, test the vehicle harness continuity between PIM X1 connector and transmission X176. Also test these circuits for short to ground and to the shield circuit if the shield circuit is not presently grounded to the PIM assembly. If any of the circuits are not within the specified range, repair or replace the wiring harness. If all circuits test normal, inspect transmission connector X176 for proper terminal contact. If transmission connector X176 tests OK, inspect the harness for an intermittent concern.
  1. If possible, determine which of the position sensor circuits have the intermittent condition by reviewing the Diagnostic Fault Information table. For example, DTCs P0C57 and P0C52 only set for a short to ground condition on either the S1 or S3 circuit.
  2. Using the Position Sensor Specification table listed below, monitor the position sensor circuits at PIM X1 connector while manipulating the applicable harness and connectors. If any of the circuits are not within specification, repair the harness or terminal as required. If a harness repair is indicated and external harness damage is not evident, the most likely location for internal wire damage is near the harness clamping locations.
  3. Disconnect transmission X176 connector and inspect for the following: Proper terminal contact Proper terminal retention in the connector Foreign material or moisture Repair, replace or clean the connector as appropriate.
  4. Reconnect all connectors and test drive the vehicle. If the DTC sets, replace the applicable drive motor generator and retest for DTCs. If the DTC sets, replace the PIM.
When Testing at PIM X1 56-way Connector/TerminalWhen Testing at Transmission X176 24-way Connector/TerminalMinimum ResistanceMaximum Resistance
Use the DT-48493 to test at X176. See Special Tools .
48-4915-167.0 ohms9.0 ohms
46-4717-1823 ohms26 ohms
44-4520-2120 ohms23 ohms
45-4915-20Over 1 M ohm
47-4915-17Over 1 M ohm
45-4717-20Over 1 M ohm

Position Sensor Specification

PIM Connector X1 56-Way Connector/TerminalTransmission X176 24-Way Connector/TerminalMinimum ResistanceMaximum Resistance
Harness Continuity Test
4915Less than 1 ohm
4816Less than 1 ohm
4717Less than 1 ohm
4618Less than 1 ohm
4520Less than 1 ohm
4421Less than 1 ohm

PIM to Transmission Terminal Reference

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PIM replacement, setup and programming
  2. «Drive Motor with Generator Assembly Removal - 2nd Position»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  3. «Transmission Control Wiring Harness Extension Harness Removal»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator power inverter control module (PIM) contains two motor control modules (MCMs). Each MCM operates its respective drive motor generator based upon hybrid powertrain control module (HPCM) commands. Each MCM controls the speed, direction and output torque of its respective drive motor generator through the sequencing actuation of high current switching transistors called insulated gate bipolar transistors (IGBTs). Each IGBT assembly is monitored for fault conditions.

  1. The high voltage contactor relays are closed.
  2. Ignition voltage is 8-18 volts.

The MCM detects excessive current flow through the switched portion of the IGBT.

  1. DTCs P0A78 and P0A79 are Type A DTCs.
  2. The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P0A78 and P0A79 are Type A DTCs.

Schematic Reference

Connector End View Reference

DTC Type Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
  1. Clear the DTC information.
  2. Turn the ignition OFF for 2 minutes.
  3. Turn the ignition ON.
  4. Operate the vehicle within the conditions for running and setting.
  5. Retest for the DTC.
  1. Perform the «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) procedure for servicing at the drive motor generator control module cable connections.
  2. Remove the 3-phase cable assembly from the PIM distribution box. Refer to «Generator Control Module 3-Phase Cable Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-repair-instructions) .
  3. Test the resistance to ground for each phase of the applicable drive motor generator by measuring between the following points with a DMM. Phase U terminal and chassis ground Phase V terminal and chassis ground Phase W terminal and chassis ground If infinite resistance is measured, replace the PIM and retest for DTCs. If DTC P0A78 or P0A79 still resets, replace the 3-phase cable assembly and the drive motor generator assembly that corresponds to the set DTC. If less than infinite is measured, continue with Circuit/System Testing.
  4. Remove the 3-phase cable assembly from the transmission. Refer to «Generator Control Module 3-Phase Cable Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-repair-instructions) . Ensure the terminals are not contacting chassis ground.
  5. Retest the resistance to ground for each phase of the 3-phase cable. Measure between the following points with a DMM. Phase U terminal and chassis ground Phase V terminal and chassis ground Phase W terminal and chassis ground If infinite resistance is measured, replace the applicable drive motor generator. If less than infinite is measured, replace the generator control module 3-phase cable assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PIM replacement, setup, and programming.
  2. «Generator Control Module 3-Phase Cable Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-repair-instructions)
  3. «Drive Motor with Generator Assembly Removal - 1st Position»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  4. «Drive Motor with Generator Assembly Removal - 2nd Position»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-off-vehicle)
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Battery Positive VoltageP0A8D*P0AFF**
* DTC while APM is charging. **DTC with APM prior to charging.

The Accessory Power Module (APM) continuously monitors its 14-volt circuit during charge or Jump Assist. This DTC sets when the 14-volt circuit in the APM drops below a set level. APM functions will run only when an APM enable message from the Hybrid powertrain control module (HPCM) is active on the high speed hybrid GMLAN communication circuit.

APM is charging or in Jump Assist.

14-volt circuit is below 10.0 volts during charge or Jump Assist.

  1. DTC P0A8D is a Type C DTC.
  2. The engine control module (ECM) will command the charge indicator and or warning message to be illuminated on the instrument panel cluster (IPC) and the driver information center (DIC), if equipped.
  3. The APM will shutdown 14-volt conversions.
  1. DTC P0A8D is a Type C DTC.
  2. 14-volt circuit is above 10.2 volts.
  1. A charging system malfunction may cause variances in system voltage and set voltage related DTCs. Refer to «DC Power Conversion Test»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-symptom-troubleshooting-diagnosis) .
  2. A poor ground connection between the APM chassis and vehicle ground may result in excess current passing through the 42-volt ground circuit connector X2 terminal 2 from the electric power steering circuit resulting in DTC P0A8D.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Perform DC Power Conversion Test before performing Circuit/System Testing.

  1. Ignition OFF, disconnect the 14-volt and 42-volt harness connectors at the APM.
  2. Test for less than 1.0 ohm between the APM chassis and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit connector X3 terminal 1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. If all circuits test normal, replace the APM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for APM replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Accessory Power Module (APM) continuously monitors its 14 volt circuit during charge or Jump Assist. This DTC sets when the 14 volt circuit in the APM rises above a set level. APM functions will run only when an APM enable message from the Hybrid Powertrain Control Module (HPCM) is active on the high speed hybrid GMLAN communication circuit.

APM is charging or in Jump Assist.

  1. 14 volt circuit is above 16.5 volts while charging.
  2. 14 volt circuit is above 16.0 volts in Jump-Assist.
  1. DTC P0A8E is a Type C DTC.
  2. The APM will shutdown charging or Jump Assist.
  1. 14 volt circuit is below 16.3 volts while charging.
  2. 14 volt circuit is below 15.8 volts in Jump-Assist.
  1. A possible cause of this DTC could be overcharging with a battery charger or jump starting.
  2. A high voltage value in multiple modules indicates a concern in the charging system.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Verify with the scan tool that the BCM is reading the voltage correctly.

  1. Turn the Ignition to ON.
  2. Connect a DMM to the 14 volt battery.
  3. Use the APM Low Voltage Control to turn on the APM 14 volt system. Vary the voltage setpoint with the scan tool ensuring that the DMM tracks the commanded voltage. If the Low Voltage Control fails, replace the APM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for APM replacement, setup, and programming.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

This vehicle does not use a 12V starter motor to crank the internal combustion engine. A much more powerful 300V drive motor generator located within the transmission is utilized to crank the engine. The 300V drive motor generator can rotate the engine to operating speed (800 RPM) within just a few hundred milliseconds. The HPCM can detect a condition where the engine is cranking but does not start or has stalled.

Drive motor generator 1 is cranking the engine.

The HPCM detects that CKP engine speed has not risen above the commanded cranking speed indicating the engine has failed to start, or the HPCM detects CKP engine speed has fallen below a specific minimum speed indicating the engine has stalled.

DTC P0AB9 is a Type A DTC.

Cranks But Does Not Start

When the ignition is turned to Crank, the HPCM will command drive motor generator 1 to rotate the engine. The drive motor will continue to rotate the engine at a specific RPM until the engine starts and causes increased engine RPM. The HPCM will cease engine rotation if an increase in engine RPM is not observed after several seconds. This function may have the appearance of a start/stall condition.

Engine Stall

If a stall occurs after a successful engine start, the HPCM will recognize the drop in engine RPM and command drive motor generator 1 to maintain engine RPM in an attempt to restart the engine. Drive motor generator 1 will continue to rotate the engine until the HPCM commands it to stop. The engine may be rotated for many minutes after the actual engine stall condition occurred and is typically stopped only after the hybrid battery state of charge (SOC) gets too low. This function may have the appearance of a running engine.

DTC P0AB9 is a Type A DTC.

Any condition that causes the engine to stall and/or not start may set this DTC. Possible conditions include

  1. Fuel conditions such as low level, low pressure, or contamination.
  2. Engine conditions such as low compression.
  3. Restricted exhaust or air intake systems.

Always inspect for DTCs that would cause an engine stall and/or no start condition. Because the hybrid system can rotate the engine at high RPM, stall and cranks-but-does-not-start conditions act differently than a non-hybrid vehicle. Refer to Action Taken When the DTC Sets .

Turn the ignition to Crank. The engine should start and run.

  1. If the engine fails to start, diagnose the engine system. Refer to «Engine Cranks But Does Not Run»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-troubleshooting-diagnosis) .
  2. If the engine starts and runs the condition is intermittent.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

This is an internal fault detection of the drive motor generator power inverter module (PIM) assembly. This fault is handled inside the PIM and no external circuits are involved.

P0AEE, P0AF3, P0BD2, P0BD7, P0BDC, and P0BE1

  1. Ignition ON after the ignition has been OFF for 6 hours.
  2. Temperature average of the inverter phase temperature sensors is greater than 12°C (10°F).
  3. Motor temperature sensor is greater than -40°C (-40°F).
  4. DTCs P0AEF, P0AF0, P0BD3, P0BD4, P0BDD, P0BDE, P0A2C, and P0A2D are not set.

P0AEF, P0AF4, P0BD3, P0BD8, P0BDD, and P0BE2

Ignition ON.

P0AF0, P0AF5, P0BD4, P0BD9, P0BDE, and P0BE3

  1. Ignition ON.
  2. Motor temperature is greater than -40°C (-40°F). If motor temperature is less than -40°C (-40°F) at Ignition ON, the drive motor must operate at greater than 20 N.m (14.75 lb ft) for a cumulative time of 1.5 minutes before the DTC will run.
  1. A 15°C ( 27°F) difference is observed between the individual inverter phase temperature sensor and the average of all the inverter phase temperatures.
  2. The above condition is present for 4 seconds.

The inverter phase temperature sensor is greater than 125°C (275°F) for 3 seconds.

The inverter phase temperature sensor is less than -40°C (-40°F) for 3 seconds.

  1. DTCs P0AEE, P0AEF, P0AF0, P0AF3, P0AF4, P0AF5, P0BD2, P0BD3, P0BD4, P0BD7, P0BD8, P0BD9, P0BDC, P0BDD, P0BDE, P0BE1, P0BE2 AND P0BE3 are Type B DTCs.
  2. The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P0AEE, P0AEF, P0AF0, P0AF3, P0AF4, P0AF5, P0BD2, P0BD3, P0BD4, P0BD7, P0BD8, P0BD9, P0BDC, P0BDD, P0BDE, P0BE1, P0BE2 AND P0BE3 are Type B DTCs.

DTC Type Reference

  1. Clear the DTC information.
  2. Ignition OFF for 1 minute.
  3. Operate the vehicle under the Conditions for Running the DTC.
  4. Retest for DTCs P0AEE, P0AEF, P0AF0, P0AF3, P0AF4, P0AF5, P0BD2, P0BD3, P0BD4, P0BD7, P0BD8, P0BD9, P0BDC, P0BDD, P0BDE, P0BE1, P0BE2 AND P0BE3.

Program the PIM with the latest software version and recheck for DTCs.

  1. If the DTC resets after programming or if the PIM already contains the latest software version, replace the PIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM replacement, setup, and programming.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Accessory Power Module (APM) controls the energy flowing between the high voltage, 300-volt, direct current (DC) and low voltage, 14-volt, DC to support the vehicles accessories and charge the 12-volt battery. The APM receives a 14-volt enable command from the Hybrid Powertrain Control Module (HPCM) over the high speed hybrid GMLAN communication circuit. APM functions will run only when the APM Enable is active on the high speed hybrid GMLAN communication circuit.

Ignition/Accessory On.

APM heat plate temperature is greater than 105°C (221°F).

  1. DTC P0AF7 is a Type C DTC.
  2. The ECM will disable engine operation or command the TAC system to operate in a reduced engine power mode.
  3. The ECM commands the reduced engine power indicator ON.
  1. DTC P0AF7 is a Type C DTC.
  2. APM heat plate temperature is less than 95°C (203°F).

This DTC could be caused by a possible power electronics cooling system failure due to the following

  1. Restricted radiator air flow or coolant fans inoperative.
  2. Restricted power electronics coolant flow or contaminated coolant.
  3. Inoperative power electronics cooling system water pump.

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Review the Failure Records when the DTC set. If the engine coolant temperature (ECT) was above 125°C (257°F) when the DTC set, go to «Symptoms - Engine Cooling»(/cadillac/escalade/gmt900-2006-2014/remont/cooling-system-mechanical/#engine-cooling-system) and correct that concern first.
  2. Operate the vehicle while monitoring the APM heat plate temperature with the scan tool.
  3. If the APM heat plate temperature is more than 100°C (212°F) proceed with Circuit/System Testing.
  1. Inspect for proper coolant level in the hybrid cooling system reservoir. If coolant level is low refer to «Generator Control Module Cooling System Draining and Filling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-cooling-system__generator-control-module-cooling-system-draining) .
  2. Inspect the hybrid cooling system radiator for debris or obstruction, or restricted or mis-routed coolant hoses. If a concern is found, repair or replace the restricted or damaged components as necessary.
  3. Inspect for proper operation of all hybrid system coolant pumps. If a concern is found, repair or replace the coolant pumps as necessary.
  4. Command the cooling fans through all operating speeds. If the cooling fans do not operate in all speeds, refer to «Cooling Fan Inoperative (without HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling Fan Inoperative (with HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
  5. If the above inspections do not identify a concern, disassemble the drive motor generator control module assembly and inspect the APM and PIM cooling surfaces for excessive corrosion or contamination restriction. Refer to «Drive Motor Generator Power Inverter Module Removal and Installation»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-repair-instructions__drive-motor-generator-power-inverter-module) . If a concern is found, clean the APM and/or PIM cooling surfaces or replace the APM as necessary.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for APM replacement, setup, and programming

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Diagnostic Repair Verification
• Control Module References
• Data Communication Schematics
• Component Connector End Views
• Drive Motor Generator Control Module Description and Operation
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• High Voltage Circuit Impact Detection Sensor Replacement
• Hybrid Controls Schematics
• DC Power Conversion Test
• Drive Motor Generator Battery Replacement and Shipping Preparation
• Diagnostic Trouble Code (DTC) List - Vehicle
• Battery Negative Cable Disconnection and Connection
• Special Tools
• Temperature Versus Resistance
• Transmission Control Wiring Harness Extension Harness Removal
• Symptoms - Engine Cooling
• Transmission Fluid Cooler Flushing and Flow Test (J 45096)
• Line Pressure Check
• Fluid Leak Diagnosis
• Transmission Fluid Level and Condition Check
• Inline Harness Connector End Views
• High Voltage Disabling
• Engine Cranks But Does Not Run
• Generator Control Module Cooling System Draining and Filling
• Drive Motor Generator Power Inverter Module Removal and Installation
• Circuit/System Testing
• Action Taken When the DTC Sets

More articles — Engine