Hybrid Engine Controls - DTC p0aff to DTC p16f9 Cadillac Escalade GMT900

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.

Diagnostic Fault Information

Circuit/System Description

The accessory power module (APM) monitors its 14-volt circuit when it is enabled for charge or Jump Assist. It requires a minimum voltage on this circuit in order to begin operation. This DTC sets when the 14-volt circuit in the APM is below this minimum level at the time it is enabled. 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.

Conditions for Running the DTC

APM commanded to begin charging or Jump Assist.

Conditions for Setting the DTC

14-volt circuit at the APM is below 6.7 volts when attempting to begin charging or Jump Assist.

Action Taken When the DTC Sets

1. DTC P0AFF is a Type C DTC.
2. The APM will not allow 14-volt or 42-volt conversions to begin in this condition.

Conditions for Clearing the DTC

1. DTC P0AFF is a Type C DTC.
2. The 14-volt circuit at the APM is above 6.7 volts.

Diagnostic Aids

The APM is protected from reverse polarity connections by a 200-amp in-line mega-fuse. The output current of the APM is lower than the fuse rating.

Reference Information

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Drive Motor Generator Control Module 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

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Remove the B+ harness connector X3 at the APM.
2. Connect a test lamp between the 12-volt battery positive and the APM connector X3 at the module.
3. Ignition ON, observe the 12-volt parameter in the APM data list. The parameter should be within 0.5 volt of the actual 12-volt battery voltage. If the voltage is not within the specified range, replace the APM.
4. Ignition OFF, Remove the positive connection at the 12-volt battery.
5. Measure the resistance between the X3 connector and the battery positive connection. If the resistance is greater than 1.0 ohm, repair the high resistance condition in the 12-volt circuit. If the resistance is less than 1.0 ohm, replace the battery positive cable - control module to auxiliary BEC.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «200 Amp Mega Fuse and Auxiliary Electrical Center 12VDC Junction Block Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Battery Positive Cable Replacement (12V Battery to Auxiliary BEC)»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) or «Battery Positive Cable Replacement (Control Module to Auxiliary BEC)»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2)
3. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__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 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.

The control module runs the program to detect an internal fault when the Hybrid wake-up circuit is active.

The control module has detected an internal malfunction.

1. DTCs P0BE6, P0BE7, P0BE8, P0BEA, P0BEB, P0BEC, P0BEE, P0BEF, P0BF0, P0BF2, P0BF3, P0BF4, P0BF6, P0BF7, P0BF8, P0BFA, P0BFB and P0BFC are Type B DTCs.
2. The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P0BE6, P0BE7, P0BE8, P0BEA, P0BEB, P0BEC, P0BEE, P0BEF, P0BF0, P0BF2, P0BF3, P0BF4, P0BF6, P0BF7, P0BF8, P0BFA, P0BFB and P0BFC are Type B DTCs.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification

1. Clear the DTC information.
2. Ignition OFF for 1 minute.
3. Ignition ON.
4. Retest for DTCs P0BE6, P0BE7, P0BE8, P0BEA, P0BEB, P0BEC, P0BEE, P0BEF, P0BF0, P0BF2, P0BF3, P0BF4, P0BF6, P0BF7, P0BF8, P0BFA, P0BFB or P0BFC.

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 drive motor generator power inverter control module (PIM) contains two motor control modules (MCMs) and the hybrid powertrain control module (HPCM). Each MCM operates its respective drive motor generator based upon 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 drive motor generator operates utilizing 3-phase alternating current (ac) electricity. Each IGBT operates a single phase of the drive motor generator. Each phase is individually identified as U, V and W. Each MCM monitors the current of each phase in order to detect PIM overcurrent conditions.

Because all the motor generator phase circuits are electrically joined together, they should each flow about the same amount of current. The MCM performs a mathematical calculation to verify that the phase current sensors are accurate. If the U-V-W phase current sensors indicate about the same amount of phase current, the sum of the calculation should be near zero. If the U-V-W phase currents are not similar, this DTC will set.

1. The ignition is ON.
2. The High Voltage contactor relays are closed.

The sum of the 3 phase current sensors is greater than 75 A.

1. DTCs P0BFD and P0BFE are Type A DTCs.
2. The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P0BFD and P0BFE are Type A DTCs.

Schematic Reference

Hybrid Controls Schematics

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

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

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 less than infinite is measured, continue with Circuit/System Testing. If infinite resistance is measured, and prior to disabling the system the vehicle made no attempt to crank the engine, replace the PIM and retest for DTCs. If P0BFD or P0BFE still resets, replace the drive motor generator assembly that corresponds to the set DTC. If infinite resistance is measured, and prior to disabling the system the engine initially starts but later stalls, replace the drive motor generator assembly that corresponds to the set DTC and retest for DTCs. If P0BFD or P0BFE still resets, replace the PIM.
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 the shield ground Phase V terminal and the shield ground Phase W terminal and the shield 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.

The drive motor generator power inverter control module (PIM) contains two motor control modules (MCMs) and the hybrid powertrain control module (HPCM). Each MCM operates its respective drive motor generator based upon 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 drive motor generator operates utilizing 3-phase alternating current (ac) electricity. Each IGBT operates a single phase of the drive motor generator. Each phase is individually identified as U, V and W. Each MCM monitors the current of each phase in order to detect PIM overcurrent conditions.

The Hybrid Wakeup circuit is active.

One or more phase currents are greater than 680 A.

1. DTCs P0C01 and P0C04 are Type A DTCs.
2. The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P0C01 and P0C04 are Type A DTCs.

Schematic Reference

Hybrid Controls Schematics

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

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 less than infinite is measured, continue with Circuit/System Testing. If infinite resistance is measured, replace the drive motor generator assembly that corresponds to the set DTC and retest for DTCs. If DTC P0C01 or P0C04 still resets, replace the PIM.
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 the shield ground Phase V terminal and the shield ground Phase W terminal and the shield 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.

Each drive motor generator is controlled by a motor control module (MCM). The drive motor generators utilize 3 phase alternating current (ac) electricity. The drive motor generator stator coil is comprised of three phase circuits. The phase circuits are identified as phase U, phase V and phase W. The U-V-W phase circuits are connected in a wye configuration. This means each phase is connected at a single, central point. The MCM monitors a current sensor connected to each drive motor generator phase.

1. The Hybrid Wakeup circuit is active.
2. The MCM has applied current to the drive motor generator.

The MCM detects at least one U-V-W phase current sensor is less than 9 amps.

1. DTC P0C05 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 P0C05 is a Type A DTC.

Schematic Reference

Hybrid Controls Schematics

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

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Attempt to start the engine.
4. Retest for DTC P0C05.

1. Disable the high voltage for servicing at the drive motor generator control module assembly cable connections. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
2. Inspect for damaged 3 phase cables between the drive motor generator power inverter control module (PIM) and the transmission. If damage is observed, replace the 3 phase cables.
3. 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) .
4. Test the resistance of each phase by measuring between the following circuits with a DMM. Phase U and phase V Phase U and phase W If you meaure 0.5 ohms or less replace the drive motor generator assembly and retest for the DTC. If the DTC resets, replace the PIM. If you measure greater than 0.5 ohms continue with diagnosis.
5. Remove the 3 phase cable assembly cover from the transmission and inspect the 3 phase cable terminal fasteners for the proper torque and for arc-flash damage. Refer to «Generator Control Module 3-Phase Cable Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-repair-instructions) . If any fasteners were loose and no arc-flash damage is present, torque the fasteners and re-assembly the vehicle. Retest for the DTC. If any fasteners were loose and arc-flash damage is present, replace the drive motor generator assembly and the 3 phase cable assembly.
6. Disconnect the 3 phase cable assembly from the transmission.
7. Test each cable for continuity from the PIM connection terminal to the transmission connection terminal. If you measure greater than 0.5 ohms, replace the 3 phase cable assembly. If you measure 0.5 ohms or less replace the drive motor generator 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) .

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.

Each drive motor generator is controlled by a motor control module (MCM). The drive motor generators utilize 3 phase alternating current (ac) electricity. The drive motor generator stator coil is comprised of three phase circuits. The phase circuits are identified as phase U, phase V and phase W. The U-V-W phase circuits are connected in a wye configuration. This means each phase is connected at a single, central point. The MCM monitors a current sensor connected to each drive motor generator phase.

1. The Hybrid Wakeup circuit is active.
2. The MCM has applied current to the drive motor generator.

The MCM detects at least one U-V-W phase current sensor is less than 9 amps.

1. DTC P0C08 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 P0C08 is a Type A DTC.

Schematic Reference

Hybrid Controls Schematics

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

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Attempt to drive the vehicle.
4. Retest for DTC P0C08.

1. Disable the high voltage for servicing at the Drive Motor Generator Control Module Assembly cable connections. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
2. Inspect for damaged 3 phase cables between the drive motor generator power inverter control module (PIM) and the transmission. If damage is observed, replace the 3 phase cables.
3. 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) .
4. Test the resistance of each phase by measuring between the following circuits with a DMM. Phase U and phase V Phase U and phase W If you meaure 0.5 ohms or less replace the drive motor generator assembly and retest for the DTC. If the DTC resets, replace the PIM. If you measure greater than 0.5 ohms continue with diagnosis.
5. Remove the 3 phase cable assembly cover from the transmission and inspect the 3 phase cable terminal fasteners for the proper torque and for arc-flash damage. Refer to «Generator Control Module 3-Phase Cable Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-repair-instructions) . If any fasteners were loose and no arc-flash damage is present, torque the fasteners and re-assembly the vehicle. Retest for the DTC. If any fasteners were loose and arc-flash damage is present, replace the drive motor generator assembly and the 3 phase cable assembly.
6. Disconnect the 3 phase cable assembly from the transmission.
7. Test each cable for continuity from the PIM connection terminal to the transmission connection terminal. If you measure greater than 0.5 ohms, replace the 3 phase cable assembly. If you measure 0.5 ohms or less replace the drive motor generator 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 - 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.

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.

The inverter self test is complete.

The control module does not detect voltage at the isolated gate bi-polar transistor (IGBT) bias supply.

1. DTCs P0C0B and P0C0E are Type A DTCs.
2. The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTCs P0C0B and P0C0E are Type A DTCs.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Ignition OFF for 1 minute.
3. Ignition ON.
4. Retest for DTCs P0C0B or P0C0E.

Ignition ON, retest for DTC P0C0B or P0C0E.

1. 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.

The drive motor generator power inverter control module (PIM) contains two motor control modules (MCMs) and the hybrid powertrain control module (HPCM). Each MCM operates its respective drive motor generator based upon 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 drive motor generator operates utilizing 3 phase alternating current (ac) electricity. Each IGBT operates a single phase of the drive motor generator. Each phase is individually identified as U, V and W. Each MCM monitors the temperature of each phase in order to detect PIM overtemperature conditions.

P0C11-P0C16

The Hybrid Wakeup circuit is active

P0C11

P0AEE, P0AEF, and P0AF0 are not set.

P0C12

P0BD2, P0BD3, and P0BD4 are not set.

P0C13

P0BDC, P0BDD and P0BDE are not set.

P0C14

P0AF3, P0AF4, and P0AF5 are not set.

P0C15

P0BD7, P0BD8, and P0BD9 are not set.

P0C16

P0BE1, P0BE2, and P0BE3 are not set.

1. The phase temperature has exceeded 91°C (196°F) and has not fallen below 85°C (185°F).
2. The above condition is present for 5 seconds.

1. DTCs P0C11, P0C12, P0C13, P0C14, P0C15 and P0C16 are Type B DTCs.
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.

DTCs P0C11, P0C12, P0C13, P0C14, P0C15 and P0C16 are Type B DTCs.

Description and Operation

1. «Drive Motor Generator Control Module Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-description-and-operation)
2. «Drive Motor Generator Control Module Cooling System Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-cooling-system)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

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 MCM phase circuit temperature with the scan tool.
3. If the phase temperature is greater than 91°C (196°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. Refer to «Hybrid Cooling System Overheating (Electrical)»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-cooling-system) . 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 drive motor generator power inverter module (PIM) cooling surface 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 PIM cooling surface or replace the PIM as necessary.

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 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 assembly.

Offset is the relationship between the position sensor and the drive motor generator output shaft. Whenever the ignition is cycled to OFF, the MCM attempts to learn the offset of the drive motor position sensor. The MCM will attempt to learn the position at hybrid wake-up (ignition ON) only if no valid offset value has ever been learned. This condition would normally occur only after an MCM reprogramming event.

Condition 1, 2, 3 and 4

1. Hybrid wake-up signal is active.
2. The MCM has not previously learned a valid drive motor position sensor offset value.

Condition 2

Motor speed is less than 20 RPM.

Condition 1

Position sensor offset value not learned because drive motor speed is greater than 50 RPM.

Position sensor offset value not learned because hybrid battery voltage is less than 192V.

Condition 3

Position sensor offset value not learned because drive motor phase to phase current difference is less than 15 A.

Condition 4

Position sensor offset value not learned because offset learn value is greater than 25 degrees.

P0C17 and P0C18 are Type B DTCs.

P0C17 and P0C18 are Type B DTCs.

Schematic Reference

Hybrid Controls Schematics

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, wait 2 minutes.
2. Ignition ON, wait 2 minutes and then turn ignition OFF.
3. Ignition ON, monitor DTC Status. DTC P0C17 and P0C18 should have passed last test. If the DTC has passed, clear DTC Information. No further diagnosis is necessary.

1. Inspect for DTCs P0A40, P0A45, P0A46, P0A78, P0A79, P0A3F, P0C05, P0C08, P0C0B, P0C0E, P0C4E, P0C4F, P0C52, P0C53, P0C57, P0C58, P0C61, P0C62, P0C5C, P0C5D, P1B03, P1B04 or P1B0D. If any of the above DTCs are set, diagnose and repair them prior to performing this diagnostic.
2. Ignition ON, engine OFF. Observe the HPCM 300V Circuit parameter. The hybrid battery voltage should be greater than 192V. If the hybrid battery voltage is less than 192V perform the Jump Assist procedure and attempt to successfully charge the hybrid battery. Re-test for this DTC after the Jump Assist procedure is complete. Refer to «Jump Assist»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
3. Turn the ignition OFF and wait 2 minutes.
4. Turn the ignition ON without cranking the engine. Monitor DTC Status. DTC P0C17 and P0C18 should have passed last test. If DTC P0C4E or P0C4F sets, proceed to that diagnostic procedure. If DTC P0C17 and P0C18 have passed, clear DTC Information. No further diagnosis is necessary. If DTC P0C17 or P0C18 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 drive motor generator assembly.

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. «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.

Each drive motor generator is controlled by a motor control module (MCM). The MCM constantly monitors the requested torque and the delivered torque of its respective drive motor generator.

1. Ignition voltage is 8-18 volts.
2. Drive motor generator is commanded to develop torque.

The MCM has detected that drive motor generator torque is not being delivered as expected.

1. DTC P0C19 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 P0C19 is a Type A DTC.

Because the engine and drive motor 1 are joined mechanically through a planetary gear set, an engine condition that requires drive motor 1 to consume excessive current while trying to rotate the engine may cause this DTC to set.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Inspect for DTCs P0A3F, P0A40, P0A78, P0BFD, P0C01, P0C05, P0C0B, P0C17, P0C4E, P0C52, P0C53, P0C5C, P0C5D, P1AF8, P1B03, or P1B0F. 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. Clear the DTC information.
3. Turn the ignition OFF for 1 minute.
4. Attempt to start the engine.
5. Retest for DTC P0C19.

1. Inspect for DTCs P0A3F, P0A40, P0A78, P0BFD, P0C01, P0C05, P0C0B, P0C17, P0C4E, P0C52, P0C53, P0C5C, P0C5D, P1AF8, P1B03, or P1B0F. 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. Inspect for the following conditions: IMPORTANT: If a seized condition is observed, internal transmission damage may have occurred. Seized or binding engine Seized or binding accessory drive belt If a seized or binding condition is observed, repair as required.
3. Attempt to drive the vehicle and retest for DTC P0C19. If the DTC resets and the vehicle makes no attempt to crank the engine, 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. If the engine initially starts but the vehicle later stalls, replace the drive motor generator assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Drive Motor with Generator Assembly Removal - 1st Position

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.

Each drive motor generator is controlled by a motor control module (MCM). The MCM constantly monitors the requested torque and the delivered torque of its respective drive motor generator.

1. Ignition voltage is 8-18 volts.
2. Drive motor generator is commanded to develop torque.

The MCM has detected that drive motor generator torque is not being delivered as expected.

1. DTC P0C1A 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 P0C1A is a Type A DTC.

Because the drive axle and drive motor 2 are joined mechanically through a planetary gear set, a drive axle condition that requires drive motor generator 2 to utilize excessive current while trying to rotate the drive axle may cause this DTC to set.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Inspect for DTCs P0A45, P0A46, P0A79, P0BFE, P0C04, P0C08, P0C0E, P0C18, P0C4F, P0C57, P0C58, P0C61, P0C62, P1AFE, P1B04, or P1B10. 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. Clear the DTC information.
3. Turn the ignition OFF for 1 minute.
4. Attempt to start the engine.
5. Retest for DTC P0C1A.

1. Inspect for DTCs P0A45, P0A46, P0A79, P0BFE, P0C04, P0C08, P0C0E, P0C18, P0C4F, P0C57, P0C58, P0C61, P0C62, P1AFE, P1B04, or P1B10. 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. Repair the following conditions if observed: IMPORTANT: If a seized or binding drive axle is observed, internal transmission damage may have occurred. Seized or binding drive axle Seized or binding transfer case (4 wheel drive option) Seized or binding braking system
3. Attempt to drive the vehicle and retest for DTC P0C1A. If the DTC resets and the vehicle makes no attempt to crank the engine, 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. If the engine initially starts but the vehicle later stalls, replace the drive motor generator assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Drive Motor with Generator Assembly Removal - 2nd Position

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.

Typical Scan Tool Data

Aux. Trans. Fluid Pump Fault Status 1

Aux. Trans. Fluid Pump Fault Status 2

The auxiliary transmission fluid pump (ATFP) system supplies the transmission with hydraulic pressure when the vehicle is operating in the internal combustion engine (ICE) Autostop hybrid mode. The ATFP system consists of a ATFP control module that operates an electric, 12V 3 phase alternating current (ac), motor-driven pump. Two pulse width modulated (PWM) status circuits connect the ATFP control module to the hybrid powertrain control module (HPCM). The transmission auxiliary oil pump (TAOP) control circuit delivers the HPCM commanded pump speed to the ATFP control module. The transmission auxiliary oil pump (TAOP) diagnostic circuit supplies the HPCM with the actual pump speed and also with the operating status of the ATFP control module. The HPCM monitors these circuits for fault conditions.

The ATFP control module inverts 12 v direct current (dc) into 12 v, 3 phase ac current to operate the pump motor.

The ATFP control module monitors the status of the ATFP pump as well as its own internal circuitry. The ATFP control module does not store its own diagnostic status. Current ignition cycle diagnostic status is reported to the HPCM on the TAOP diagnostic circuit. The diagnostic status within the ATFP control module is reset at every ignition-off cycle.

1. The ignition switch is in the RUN position.
2. Ignition voltage is 8-18 volts.

The control module has not detected the ATFP diagnostic signal for 1.5 seconds.

1. DTC P0C2B is a Type B DTC.
2. The HPCM disables the Autostop hybrid mode.

DTC P0C2B is a Type B DTC.

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

Component Connector End Views

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

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 38522: Variable Signal Generator

For equivalent regional tools, refer to Special Tools .

1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Turn the ignition ON.
4. Retest for DTC P0C2B.

1. Inspect for DTC B1433. If DTC B1433 is set, diagnose and repair it prior to performing this diagnostic.
2. Ignition OFF, disconnect ATFP control module X1 connector.
3. Ignition ON, test for battery voltage on the ATFP battery circuit, from ATFP vehicle harness side X1 connector terminal 4 and chassis ground. If less than battery voltage, test the ATFP battery circuit for an open/high resistance. If the circuit tests normal, continue with diagnosis.
4. Test for battery voltage on the ATFP battery circuit from ATFP vehicle harness side X1 connector terminal 4 and the ATFP control module ground circuit connector X1 terminal 5. If less than the specified range, test the ATFP ground circuit for an open/high resistance. If the circuit tests normal, continue with diagnosis.
5. Test for battery voltage on the ATFP control module ignition circuit from ATFP vehicle harness side X1 connector terminal 2 and the ATFP control module ground circuit connector X1 terminal 5. If less than the specified range, test the ATFP vehicle harness side ignition circuit for an open/high resistance or a short to ground. If the circuit tests normal, continue with diagnosis.
6. Test for 4.8-5.2 volts on the Trans. Aux. Oil Pump Diagnostic circuit, from the ATFP control module X1 connector terminal 1 and ground. If less than the specified range, test the Trans. Aux. Oil Pump Diagnostic circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the PIM. If more than the specified range, test the Trans. Aux. Oil Pump Diagnostic circuit for a short to voltage. If the circuit tests normal, replace the PIM.
7. Connect the J 38522: variable signal generator red terminal to the Trans. Aux. Oil Pump Diagnostic circuit, ATFP control module X1 connector terminal 1, vehicle harness side. Connect the J 38522: variable signal generator black terminal to chassis ground.
8. Adjust the signal generator to 50 percent duty cycle @ 250 Hz and observe the Trans. Aux. Pump Actual speed parameter with the scan tool. The scan tool should display 100 percent. If less than 100 percent, test the Trans. Aux. Oil Pump Diagnostic circuit for a short to 5V. If the circuit tests normal, replace the PIM. If 100 percent is displayed, replace the ATFP control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM or ATFP control 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.

The drive motor generator power inverter module (PIM) contains two motor control modules (MCM). Each MCM controls and monitors its respective drive motor generator based upon commands from the hybrid powertrain control module (HPCM). In order for the HPCM to monitor the internal combustion engine speed, MCM 1 is electrically connected to the crankshaft position sensor (CKP) signal and reference circuits. The MCM 1 engine speed information is broadcast to the HPCM over an internal PIM communication circuit. Additionally, the HPCM receives a GM LAN engine speed that is broadcast by the engine control module (ECM) and is based upon the ECM connection to the CKP sensor.

A drive motor generator position sensor is monitored by each motor control module (MCM). Each MCM monitors the angular position, speed and direction of its respective drive motor generator based upon the signals of the resolver-type position sensor.

The HPCM mathematically calculates what engine speed should be based upon the current transmission ratio and the drive motor generator speeds indicated by the drive motor generator position sensors.

The HPCM compares this mathematically calculated engine speed to the sensor-derived GM LAN ECM engine speed signal and MCM CKP signal engine speed. If the drive motor generator position sensor speeds are correct, the mathematical equation should accurately calculate engine speed. If the mathematical calculation for engine speed does not match the sensor-derived engine speed, a drive motor position speed sensor error is assumed and this DTC will set.

Condition 1

1. The ignition is ON.
2. Ignition voltage is greater than 6 volts.
3. GM LAN ECM or MCM 1 CKP engine speed is less than 1500 RPM.

Condition 2

1. The ignition is ON.
2. Ignition voltage is greater than 6 volts.
3. GM LAN ECM or MCM 1 CKP engine speed is greater than 1500 RPM.

The difference between GM LAN ECM or MCM 1 CKP engine speed and HPCM calculated engine speed is greater than 1499 RPM for 1 second.

The difference between GM LAN ECM or MCM 1 CKP engine speed and HPCM calculated engine speed is greater than 249 RPM for 1 second.

1. DTC P0C2F is a Type A DTC.
2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

1. DTC P0C2F is a Type A DTC.
2. GM LAN ECM or MCM 1 CKP engine speed is greater than 500 RPM and the difference from HPCM calculated engine speed is less than 151 RPM.

Any condition that allows the engine or drive motor speed sensors to indicate their actual speed incorrectly may cause this DTC to set.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Attempt to start the engine.
4. Retest for DTC P0C2F.

1. Repair the following conditions if observed: ECM CKP sensor DTCs IMPORTANT: If mechanical binding of the engine is observed, internal transmission damage may have resulted when drive motor 1 attempted to crank the seized engine. Mechanical condition which would cause drive motor 1 to rotate without a corresponding rotation of the engine.
2. Ignition ON, retest for DTC P02CF. If the DTC resets, test each drive motor generator position sensor for proper operation. Refer to «DTC P1B03 or P1B04»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-dtc-p181c-to-dtc-p2792) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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 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.

Offset is the relationship between the position sensor and the drive motor generator output shaft. When the ignition turned OFF, the MCM attempts to learn the offset of the drive motor position sensor.

1. The ignition is cycled OFF.
2. Drive motor generator speed is less than 20 RPM.

The position sensor offset exceeds 25 degrees during the learning process.

1. DTCs P0C4E and P0C4F are Type C DTCs.
2. The MCM uses the last learned valid position sensor offset.

DTCs P0C4E and P0C4F are Type C DTCs.

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

Hybrid Controls Schematics

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. Use the specifications for the drive motor generator that set the DTC. 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, replace the applicable drive motor generator assembly.
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. Use the specifications for the drive motor generator that set the DTC. 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 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.

Drive Motor 1 Position Sensor Specification

Drive Motor Position Sensor 1 PIM to Transmission Terminal Reference

Drive Motor 2 Position Sensor Specification

Drive Motor 2 Position Sensor PIM to Transmission Terminal Reference

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. «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.

Drive Motor Generator 1

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 ignition is ON.

P0C52, P0C5D

Circuit voltage less than 0.5 volts.

P0C53, P0C5C

Circuit voltage greater than 3.0 volts.

1. DTCs P0C52, P0C53, P0C5C and P0C5D 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 P0C52, P0C53, P0C5C and P0C5D are Type A DTCs.

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

Hybrid Controls Schematics

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 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.

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.

Position Sensor Specification

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.

Drive Motor Generator 1

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 ignition is ON.

P0C57 or P0C61

Circuit voltage less than 0.5 volts.

P0C58 or P0C62

Circuit voltage greater than 3.0 volts.

1. DTCs P0C57, P0C58, P0C61 and P0C62 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 P0C57, P0C58, P0C61 and P0C62 are Type A DTCs.

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

Hybrid Controls Schematics

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 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 connector X1.
9. Using the PIM to Transmission Terminal Reference table listed below, test the vehicle harness continuity between PIM X1 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.

Position Sensor Specification

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.

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 engine torque delivered calculation is correct.

1. The control module runs the program to detect an internal fault when the key is ON for 5 seconds.
2. Ignition voltage is 8-18V.

The control module has detected an internal malfunction.

1. DTC P15F0 is a Type A DTC.
2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P15F0 is a Type A DTC.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Ignition OFF for 1 minute.
3. Ignition ON.
4. Retest for DTCs P15F0.

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.

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 axle torque requested calculation is correct.

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. DTC P15F1 is a Type A DTC.
2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P15F1 is a Type A DTC.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Ignition OFF for 1 minute.
3. Ignition ON.
4. Retest for DTC P15F1.

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.

This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM). The hybrid powertrain control module (HPCM) sends an engine torque requested message to the ECM over GMLAN. The ECM monitors the data to verify that the indicated engine torque requested calculation is correct. The ECM processor monitors the data to verify that the engine torque command is correct.

1. The control module runs the program to detect an internal fault when the key is ON.
2. Ignition voltage is 8-18V.
3. DTC U1817 is not set.

The control module has detected an internal malfunction.

1. DTC P15F2 is a Type A DTC.
2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P15F2 is a Type A DTC.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Ignition OFF for 1 minute.
3. Ignition ON.
4. Retest for DTC P15F2.

Program the engine control module (ECM) with the latest software version and recheck for DTCs.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM 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.

Internal Mode Switch (IMS)

The internal mode switch (IMS) assembly is a sliding contact switch attached to the control valve body within the transmission. The nine outputs from the switch indicate which position is selected by the transmission manual shaft. Four outputs (A, B, C, P), are range selection inputs to the transmission control module (TCM). Five outputs (R1, R2, D1, D2, S) are direction selection inputs to the hybrid powertrain control module (HPCM). The input voltage at the module is high when the switch is open and low when the switch is closed to ground.

The HPCM compares the requested direction to other data to verify that the indicated direction range switch calculation is correct.

1. The ignition is ON.
2. Ignition voltage is 8-18 volts.

1. No IMS direction switch DTCs are set.
2. A valid IMS direction indicated by the IMS switch does not match the direction indicated by the HPCM software.

1. No IMS direction switch DTCs are set.
2. Two valid IMS directions are indicated at the same time.

1. One IMS direction switch circuit has failed.
2. The HPCM calculates a transmission direction based upon the remaining IMS circuits but it does not match the direction indicated by the HPCM software.

1. One IMS direction switch circuit has failed.
2. Based upon the remaining IMS circuits the HPCM calculated two directions at the same time.

Condition 5

More than one IMS direction circuit has failed and the HPCM cannot calculate a transmission direction.

1. DTC P16F2 is a Type A DTC.
2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P16F2 is a Type A DTC.

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

Component Connector End Views

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

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. DT-47825-10 Jumper Harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
2. DT-48493 Jumper Harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .

1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Turn the ignition ON.
4. Test for correct operation of the Direction IMS in every range selection. Hold the selector in each gear position for at lease 2 seconds. Refer to Typical Scan Tool Data. If the Direction IMS operation does not match the logic table proceed with Circuit/System Testing.
5. Retest for DTC P16F2. 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.

1. Disconnect the transmission X176 24-way connector. Ignition ON. The scan tool IMS Status parameter should display HI for the R1, R2, D1, D2 and S signal circuit displays. If a signal displays LOW, disconnect the PIM connector X1 and test the circuit for a short to ground. If the circuit tests normal, replace the PIM.
2. Install DT-48493 to the vehicle harness connector X176. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . Verify that a test lamp illuminates between the Direction IMS switch ground circuit and battery positive. If the test lamp does not illuminate, disconnect PIM connector X1 and test the ground circuit for an open, high resistance or short to voltage condition. If the circuit tests normal, replace the PIM.
3. Connect a 3-amp fused jumper wire between each Direction IMS signal circuit at DT-48493 and the ground circuit terminal. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . The scan tool parameter should display LOW for each signal circuit when grounded. If a scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition. If the circuit tests normal, replace the PIM.
4. Disconnect the transmission 16-way X175 connector. Install DT-47825-10 to the vehicle harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . Connect a 3-amp fused jumper wire between the Starter signal circuit terminal and ground. The scan tool parameter should display LOW when the signal circuit is grounded. If the scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition. If the circuit tests normal, replace the PIM.
5. Disconnect the IMS connector at the switch. IMPORTANT: Connect one end of the DT-48493 to the transmission connector. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . Use the other end as the terminal testing point. Test the direction signal circuits and the ground circuit between the IMS and the transmission 24-way X176 connector for a short to ground, open, high resistance or short to voltage condition. IMPORTANT: Connect one end of the DT-47825-10 to the transmission connector. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . Use the other end as the terminal testing point. Test the Starter signal circuit between the IMS and the transmission 16-way X175 connector for a short to ground, open, high resistance or short to voltage condition. The TCM is a pass-through of the Starter signal circuit and should be tested as a typical circuit path. If the circuit, including the TCM, tests normal, replace the IMS switch.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PIM or TCM replacement, setup, and programming.
2. «Manual Shift Shaft Position Switch Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-on-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.

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 stores identical data in two locations and compares the data to verify that the stored data is correct.

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 that identical stored data is not the same when retrieved.

1. DTC P16F3 is a Type A DTC.
2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P16F3 is a Type A DTC.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Inspect for DTC P1AC6, P0335, or 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. Clear the DTC information.
3. Ignition OFF for 1 minute.
4. Ignition ON.
5. Retest for DTC P16F3.

1. Inspect for DTC P1AC6, P0335, or any 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. 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.

Internal Mode Switch (IMS)

The internal mode switch (IMS) assembly is a sliding contact switch attached to the control valve body within the transmission. The nine outputs from the switch indicate which position is selected by the transmission manual shaft. Four outputs (A, B, C, P), are range selection inputs to the transmission control module (TCM). Five outputs (R1, R2, D1, D2, S) are direction selection inputs to the hybrid powertrain control module (HPCM). The input voltage at the module is high when the switch is open and low when the switch is closed to ground.

The HPCM compares the IMS range position to the IMS direction position to verify the transmission direction is correct.

1. The ignition is ON.
2. Ignition voltage is 8-18 volts.

The transmission direction, indicated by both the IMS range and direction switch circuits, are valid but do not match.

1. One IMS direction switch circuit has failed.
2. The HPCM calculates a transmission direction base upon the remaining IMS direction circuits.
3. The calculated HPCM transmission direction does not match the direction indicated by the IMS range switch circuits.

1. One IMS direction switch circuit has failed.
2. The HPCM calculates a transmission direction based upon the remaining IMS direction circuits.
3. The IMS range switch indicated a transitional position.

1. One IMS direction switch circuit has failed.
2. The HPCM calculates a transmission direction based upon the remaining IMS direction circuits.
3. The TCM has indicated at least one IMS range switch circuit has failed.

1. More than one IMS direction circuit has failed and the HPCM cannot calculate a transmission direction.
2. The IMS range switch indicates a transitional position.

Condition 6

1. More than one IMS direction circuit has failed and the HPCM cannot calculate a transmission direction.
2. The TCM has indicated at least one IMS range switch circuit has failed.

1. DTC P16F4 is a Type A DTC.
2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P16F4 is a Type A DTC.

If IMS circuit DTCs P181C-P181F, P183A-P183F, P184A or P184B are set, perform those diagnostics first.

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

Component Connector End Views

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

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. DT-47825-10 Jumper Harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .
2. DT-48493 Jumper Harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) .

1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Turn the ignition ON.
4. Test for correct operation of the direction and range IMS switch circuits in every gear selection. Hold the selector in each gear position for at least 2 seconds. Refer to Typical Scan Tool Data. If the Direction IMS operation does not match the logic table proceed with Circuit/System Testing. If the IMS A/B/C/P operation does not match the logic table proceed to «DTC P1824, P182A-P182F, P1838, or P1839»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-dtc-p0969-to-dtc-p02730p279d) .
5. Retest for DTC P16F4. 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.

1. Disconnect the transmission X176 24-way connector. Ignition ON. The scan tool IMS Status parameter should display HI for the R1, R2, D1, D2 and S signal circuit displays. If a signal displays LOW, disconnect the PIM connector X1 and test the circuit for a short to ground. If the circuit tests normal, replace the PIM.
2. Install DT-48493 to the vehicle harness connector X176. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . Verify that a test lamp illuminates between the Direction IMS switch ground circuit and battery positive. If the test lamp does not illuminate, disconnect PIM connector X1 and test the ground circuit for an open, high resistance or short to voltage condition. If the circuit tests normal, replace the PIM.
3. Connect a 3-amp fused jumper wire between each Direction IMS signal circuit at DT-48493 and the ground circuit terminal. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . The scan tool parameter should display LOW for each signal circuit when grounded. If a scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition. If the circuit tests normal, replace the PIM.
4. Disconnect the transmission 16-way X175 connector. Install DT-47825-10 to the vehicle harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . Connect a 3-amp fused jumper wire between the Starter signal circuit terminal and ground. The scan tool parameter should display LOW when the signal circuit is grounded. If the scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition. If the circuit tests normal, replace the PIM.
5. Disconnect the IMS connector at the switch. IMPORTANT: Connect one end of the DT-48493 to the transmission connector. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . Use the other end as the terminal testing point. Test the direction signal circuits and the ground circuit between the IMS and the transmission 24-way X176 connector for a short to ground, open, high resistance or short to voltage condition. IMPORTANT: Connect one end of the DT-47825-10 to the transmission connector. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-special-tools-equipment) . Use the other end as the terminal testing point. Test the Starter signal circuit between the IMS and the transmission 16-way X175 connector for a short to ground, open, high resistance or short to voltage condition. The TCM is a pass-through of the Starter signal circuit and should be tested as a typical circuit path. If the circuit, including the TCM, tests normal, replace the IMS switch.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PIM or TCM replacement, setup, and programming.
2. «Manual Shift Shaft Position Switch Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-repair-instructions-on-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.

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. The HPCM monitors the ability of the PLD to perform these functions.

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 PLD malfunction.

1. DTC P16F5 is a Type A DTC.
2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P16F5 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

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Turn the ignition ON.
4. Retest for DTC P16F5.

1. 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) .
2. Wait 2 minutes.
3. 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) .
4. Ignition ON, retest for DTC P16F5. 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 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 commanded range state calculation is correct.

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 the commanded transmission range state is not correct based upon internal calculations or by a comparison to input or output torque conditions.

1. DTC P16F6 is a Type A DTC.
2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P16F6 is a Type A DTC.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Ignition OFF for 1 minute.
3. Ignition ON.
4. Retest for DTC P16F6.

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.

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. The HPCM monitors the ability of the PLD to perform these functions.

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 the internal PLD has not turned ON or OFF correctly.

1. DTC P16F9 is a Type A DTC.
2. The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

DTC P16F9 is a Type A DTC.

A low 12V battery condition, an intermittent loss of power, or loss of communication to the drive motor generator power inverter module assembly (PIM) may set this DTC.

Connector End View Reference

Component Connector End Views

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Inspect for DTC P0562 or any communication U-code DTCs. If the specified DTCs have 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. Clear the DTC information.
3. Ignition OFF for 1 minute.
4. Ignition ON.
5. Retest for DTC P16F9.

1. Inspect for DTC P0562 or any communication DTCs. If the specified DTCs have 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.
3. Wait 2 minutes.
4. Disconnect PIM connector X1.
5. Wait 2 minutes.
6. Reconnect PIM connector X1.
7. Ignition ON, retest for DTC P16F9. 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.

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Hybrid Controls Schematics
• Component Connector End Views
• Drive Motor Generator Control Module Description and Operation
• Circuit Testing
• Testing for Intermittent Conditions and Poor Connections
• Control Module References
• Diagnostic Repair Verification
• 200 Amp Mega Fuse and Auxiliary Electrical Center 12VDC Junction Block Replacement
• Battery Positive Cable Replacement (12V Battery to Auxiliary BEC)
• Connector Repairs
• Wiring Repairs
• High Voltage Disabling
• Generator Control Module 3-Phase Cable Assembly Replacement
• Drive Motor with Generator Assembly Removal - 1st Position
• Drive Motor Generator Control Module Cooling System Description and Operation
• Symptoms - Engine Cooling
• Generator Control Module Cooling System Draining and Filling
• Drive Motor Generator Power Inverter Module Removal and Installation
• Jump Assist
• Diagnostic Trouble Code (DTC) List - Vehicle
• Special Tools
• DTC P1B03 or P1B04
• Inline Harness Connector End Views
• Manual Shift Shaft Position Switch Replacement
• DTC P1824, P182A-P182F, P1838, or P1839