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/EV Battery System High Voltage Present

Circuit/System Description

The hybrid powertrain control module monitors system high voltage via the battery energy control module. The battery energy control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the battery energy control module to the hybrid powertrain control module 2 through serial data. The hybrid powertrain control module 2 is the host controller for diagnostic trouble code (DTC) information.

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

Conditions for Running the DTC

* Vehicle is ON.

* The system voltage is at least 10 V.

Conditions for Setting the DTC

The high voltage bus voltage is greater than 200 V 3.5 seconds after the contactors have been commanded open.

Action Taken When the DTC Sets

DTC P0C76 is a Type A DTC.

Conditions for Clearing the DTC

DTC P0C76 is a Type A DTC.

Reference Information

DTC Type Reference

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

Circuit/System Verification

Refer to Hybrid\EV Battery Voltage Present Hybrid/EV Battery Voltage Present. If the contactors test normal, replace the T6 power inverter module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Programming and Relearning for Drive Motor Generator Power Inverter Module, also called the power inverter module, replacement, programming, and setup.