Hybrid/EV Controls

DTC P2537

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 P2537

-
Ignition Switch Accessory Position Circuit Low

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The generator control module also called the starter generator control module is comprised of the following three control modules; the hybrid powertrain control module, 14 volt power module and the drive motor control module. These three control modules are non serviceable and are part of the generator control module.

The hybrid powertrain control module monitors the system voltage on the accessory voltage circuit.

Conditions for Running the DTC

* The Ignition is ON.

* The generator control module is communicating on the serial data circuits.

Conditions for Setting the DTC

The generator control module detects less than 2 volts on the ignition voltage circuit at the generator control module for greater than 10 seconds.

Action Taken When the DTC Sets

P2537 is a Type C DTC.

Conditions for Clearing the DTC

P2537 is a Type C DTC.

Diagnostic Aids

Verify the charging system is functioning correctly.

Reference Information

Schematic Reference

Hybrid Energy Storage Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Connector End Views By Name

Description and Operation

* Starter Generator Description and Operation Starter Generator Description and Operation

* Generator Control Module Description and Operation Generator Control Module Description and Operation

* Hybrid Modes of Operation Description Hybrid Modes of Operation 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

* Wiring Repairs Wiring Repairs

DTC Type Reference

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

Circuit/System Testing

1. Ignition OFF, disconnect K59 starter generator control module X2 connector.

2. Ignition ON, test for 8-18V between the K59 starter generator control module X2 connector accessory voltage circuit terminal 8 and ground.

• If not within the specified range, test the accessory voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the K59 starter generator control module.

Repair Instructions

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

Control Module References Programming and Relearning for Starter Generator Control Module, also called the Starter Generator Control Module, replacement, programming and setup.