2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1213

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1213

P0A8E

DTC P0A8E

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0A8E

- 14 Volt Power Module System Voltage High

Circuit/System Description

The Accessory Power Module (APM) continuously monitors its 14 volt circuit during charge or Jump Assist. This DTC sets when the 14 volt

circuit in the APM rises above a set level. APM functions will run only when an APM enable message from the Hybrid Powertrain Control Module

(HPCM) is active on the high speed hybrid GMLAN communication circuit.

Conditions for Running the DTC

APM is charging or in Jump Assist.

Conditions for Setting the DTC

* 14 volt circuit is above 16.5 volts while charging.

* 14 volt circuit is above 16.0 volts in Jump-Assist.

Action Taken When the DTC Sets

* DTC P0A8E is a Type C DTC.

* The APM will shutdown charging or Jump Assist.

Conditions for Clearing the DTC

* 14 volt circuit is below 16.3 volts while charging.

* 14 volt circuit is below 15.8 volts in Jump-Assist.

Diagnostic Aids

* A possible cause of this DTC could be overcharging with a battery charger or jump starting.

* A high voltage value in multiple modules indicates a concern in the charging system.

Reference Information

Schematic Reference

Hybrid Controls Schematics ()

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Drive Motor Generator Control Module Description and Operation ()

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code