2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1212

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1212

Action Taken When the DTC Sets

* DTC P0A8D is a Type C DTC.

* The engine control module (ECM) will command the charge indicator and or warning message to be illuminated on the instrument panel

cluster (IPC) and the driver information center (DIC), if equipped.

* The APM will shutdown 14-volt conversions.

Conditions for Clearing the DTC

* DTC P0A8D is a Type C DTC.

* 14-volt circuit is above 10.2 volts.

Diagnostic Aids

* A charging system malfunction may cause variances in system voltage and set voltage related DTCs. Refer to DC Power Conversion Test (

).

* A poor ground connection between the APM chassis and vehicle ground may result in excess current passing through the 42-volt ground

circuit connector X2 terminal 2 from the electric power steering circuit resulting in DTC P0A8D.

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

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Perform DC Power Conversion Test () before performing Circuit/System Testing.

Circuit/System Testing

Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the 14-volt and 42-volt harness connectors at the APM.

2. Test for less than 1.0 ohm between the APM chassis and ground.

瀚慖f greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit connector X3 terminal 1 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. If all circuits test normal, replace the APM.

Repair Instructions

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

Control Module References (See: Testing and Inspection/Programming and Relearning) for APM replacement, setup, and programming