P15F2

DTC P15F2

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 P15F2
- Engine Torque Command Signal Message Counter Incorrect

Circuit/System Description

This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM). The hybrid powertrain control module (HPCM) sends an engine torque requested message to the ECM over GMLAN. The ECM monitors the data to verify that the indicated engine torque requested calculation is correct. The ECM processor monitors the data to verify that the engine torque command is correct.

Conditions for Running the DTC

* Ignition is ON.

* The system voltage is greater than 9.5 V.

* DTC U1817 is not set.

Conditions for Setting the DTC

The control module has detected an internal malfunction.

Action Taken When the DTC Sets

* DTC P15F2 is a Type A DTC.

* The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

Conditions for Clearing the DTC

DTC P15F2 is a Type A DTC.

Reference Information

Description and Operation

* Starter Generator Description and Operation

* Generator Control Module Description and Operation

* Hybrid Modes of Operation Description

DTC Type Reference

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

Circuit/System Testing

Note: Diagnose and repair any communication DTCs prior to performing this testing.

1. Ignition ON.

2. Verify DTC P15F2 is not set.

• If the DTC is set

1. Program the K20 Engine Control Module.

2. Verify the DTC does not set.

• If the DTC sets, replace the K20 Engine Control Module.

• If the DTC does not set

3. All OK

• If the DTC is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Control Module References for K20 ECM Module replacement, programming and setup