P0C76

DTC P0C76

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (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

Component Connector End Views (Connector Views)
Description and Operation

Drive Motor Battery System Description ()
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Special Tools

EL-48900 HEV Safety Kit

Circuit/System Verification

Verify that P0C76 is not set.

If DTC is set, refer to High Voltage Contactor/Relay Malfunction ().