The accessory power module (APM) monitors its 14-volt circuit when it is enabled for charge or Jump Assist. It requires a minimum voltage on this circuit in order to begin operation. This DTC sets when the 14-volt circuit in the APM is below this minimum level at the time it is enabled. 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.

APM commanded to begin charging or Jump Assist.

14-volt circuit at the APM is below 6.7 volts when attempting to begin charging or Jump Assist.

The APM is protected from reverse polarity connections by a 200-amp in-line mega-fuse. The output current of the APM is lower than the fuse rating.

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

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Remove the B+ harness connector X3 at the APM.
2. Connect a test lamp between the 12-volt battery positive and the APM connector X3 at the module.
3. Ignition ON, observe the 12-volt parameter in the APM data list. The parameter should be within 0.5 volt of the actual 12-volt battery voltage.

⇒	If the voltage is not within the specified range, replace the APM.

4. Ignition OFF, Remove the positive connection at the 12-volt battery.
5. Measure the resistance between the X3 connector and the battery positive connection.

⇒	If the resistance is greater than 1.0 ohm, repair the high resistance condition in the 12-volt circuit.

⇒	If the resistance is less than 1.0 ohm, replace the battery positive cable - control module to auxiliary BEC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.