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DTC P15F9

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for a overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P15F9: Hybrid System Engine Speed Control Intervention Request Type Signal Message Counter Incorrect

Circuit/System Description

The hybrid powertrain control module is constantly sending serial data messages to the ECM regarding the operating state of the powertrain propulsion system. These messages are sent in a continuously repeating series of rolling counts with associated password protect samples and each count/sample is assigned a value. The ECM uses the values, during a propulsion system mode shift, to determine when and at what RPM to idle the internal combustion engine. When the ECM determines that too many of the counts/samples contain an error value, the ECM sets DTC P15F9.

Conditions for Running the DTC
    • DTC U1817 is not set.
    • The engine run time is greater than 0.5 s.
    • No other CAN errors are present.
    • DTC P15F9 runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that 10 of 16 counts/samples contain an error value.

Action Taken When the DTC Sets

DTC P15F9 is a Type B DTC

Conditions for Clearing the DTC

DTC P15F9 is a Type B DTC.

Diagnostic Aids

An intermittent fault in the CAN circuits will cause the ECM to set DTC P15F9.

Reference Information

Description and Operation

Hybrid Modes of Operation Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

    Note: Correct any engine control DTCs before diagnosing hybrid powertrain control module DTCs.

  1. DTC P15F9 is an informational DTC. If there are no other engine control DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for diagnosis of hybrid powertrain control module DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

   


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