P0AC4

DTC P0AC4

Diagnostic Instructions

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

DTC Descriptor
DTC P0AC4
- Hybrid Powertrain Control Module Requested MIL Illumination

Circuit/System Description

The hybrid powertrain control module uses the serial data network to signal the engine control module (ECM) that the hybrid system is requesting malfunction indicator lamp (MIL) illumination. A DTC is set in the hybrid powertrain control module and the request for MIL illumination is sent when the hybrid powertrain control module has determined that a failure that affects emissions has occurred in the hybrid control system. When the ECM receives the message from the hybrid powertrain control module, DTC P0AC4 will set in the ECM.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The hybrid powertrain control module is requesting MIL illumination.

Action Taken When the DTC Sets

* DTC P0AC4 is a Type A DTC.
* DTC P0AC4 will continue to be current or active as long as the hybrid powertrain control module is requesting MIL illumination.

Conditions for Clearing the MIL/DTC

DTC P0AC4 is a Type A DTC.

Reference Information
DTC Type Reference

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

Repair Instructions

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

Refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions) to repair the DTCs set in the hybrid powertrain control module.