Sunday, June 7, 2020

2010 Cadillac Truck Escalade RWD V8-6.2L Page 1458

2010 Cadillac Truck Escalade RWD V8-6.2L Page 1458

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Control Module References (See: Testing and Inspection/Programming and Relearning) for PIM replacement, setup and programming

* Drive Motor with Generator Assembly Removal - 2nd Position (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/13. Drive Motor with Generator Assembly Removal

- 2nd Position)

* Transmission Control Wiring Harness Extension Harness Removal (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/5. Transmission Control Wiring Harness Extension

Harness Removal)

P0C76

DTC P0C76

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0C76

- Hybrid Battery System High Voltage Present

Circuit/System Description

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator

battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is

communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through the serial data. The

hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The drive motor generator power inverter module assembly (PIM) contains capacitors and a resistor circuit intended to discharge the electrical

energy stored within the capacitors. Whenever the high voltage contactors are opened, the hybrid powertrain control module connects an internal

resistor circuit across the high voltage positive and negative circuits. If high voltage is detected monitored by the hybrid powertrain control module

after the resistor circuit has been connected, the hybrid powertrain control module commands the motor control modules (MCMs) to connect the

motor phase circuits across the DC high voltage positive and negative circuits. If high voltage is monitored by the hybrid powertrain control module

after the motor phase circuits have been connected, indicating a stuck-closed contactor, this DTC will set.

Conditions for Running the DTC

* Ignition OFF, during high voltage shutdown.

* Ignition voltage is 9-18 V.

Conditions for Setting the DTC

High voltage has been detected by the hybrid powertrain control module after the contactors have been commanded to open.

Action Taken When the DTC Sets

DTC P0C76 is a Type C DTC.

Conditions for Clearing the DTC

* DTC P0C76 is a Type C DTC.

* To clear this DTC from the hybrid powertrain control module, you must use the scan tool Special Functions, under the HPCM special

functions Clear 300V Present DTC, only after the repair is complete.

Reference Information

Schematic Reference

Hybrid Energy Storage Schematics ()

Connector End View Reference