GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Captiva Sport 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 DTC P0A8F

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

DTC Descriptor

DTC P0A8F: 14 Volt Power Module System Performance

Circuit/System Description

When set with no accompanying DTCs, this diagnostic is an internal fault detection of the Accessory Power Module (APM) assembly. This fault is handled inside the APM assembly and no external circuits are involved.

Conditions for Running the DTC
    • Ignition voltage is 7-16 volts.
    • The APM runs a portion of the diagnostics for this DTC at Accessory/Ignition On.
    • The APM runs more diagnostics for DTC P0A8F at APM 14 volt enable active.

Conditions for Setting the DTC
    • An associated DTC has caused an internal APM malfunction or
    • The APM has detected an internal malfunction.

Action Taken When the DTC Sets
    • DTC P0A8E 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 ECM will not illuminate the malfunction indicator lamp (MIL).
    • The Hybrid Powertrain Control Module (HPCM) stores the DTC information in memory when the diagnostic runs and fails.
    • The APM will shutdown 14 volt conversions based on the associated DTC.

Conditions for Clearing the DTC
    • DTC P0A8E is a Type C DTC.
    • Ignition off, APM goes to sleep.

Reference Information

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Drive Motor Generator Control Module Description and Operation

Electrical Information Reference

    •  High Voltage Disabling
    •  High Voltage Enabling
    •  Circuit Testing
    •  Testing for Intermittent Conditions and Poor Connections

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Start the Engine.
  2. Check for any other DTCs.
    3. ⇒If other APM associated DTCs are set, diagnose those DTCs first.
  3. Retest for DTC P0A8F.

Circuit/System Testing

Reprogram the APM and recheck for DTCs.

⇒If the DTC resets with no accompanying DTCs, replace the APM.

Component Testing
  1. Turn the Ignition to ON.
  2. Connect a DMM to the 12 volt battery.
  3. Use the Device Control "APM 14 V Enable" to turn on the APM 14 volt system.
  4. Vary the voltage setpoint with the scan tool insuring that the DMM tracks the commanded voltage.
    5. ⇒If the 14 V Device Control fails, replace the APM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for APM replacement, setup, and programming.