The starter generator control module (SGCM) monitors the hybrid battery voltage to verify that the output voltage (36 volts) Is within normal operating value (above 22 volts). If the output voltage is not within this value, this DTC will set.

The engine is running.

36 volt output voltage is less than 22 volts for 2 seconds.

36-volt output voltage increases to greater than 22 volts.

Schematic Reference

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the scan tool Hybrid System Voltage parameter in the SGCM data list. The voltage should be greater than 22 volts. If the parameter displays less than the specified value, refer to SGCM 36-volt Output Terminal Circuit Low.
2. Ignition ON, observe the scan tool Hybrid System Voltage parameter in the BECM data list. The voltage should be greater than 22 volts. If the parameter displays less than the specified value, refer to Battery Pack Voltage Low.

Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.

Caution: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.

SGCM 36-Volt Output Terminal Circuit Low

1. If DTC is history, refer to Testing for Intermittent Conditions and Poor Connections .
2. Ignition ON, test for greater than 22 volts at the SGCM battery positive 36-volt output voltage stud.

⇒	If less than the specified value, test the 36-volt cable for an open/high resistance or short to ground.

⇒	If greater than the specified value, replace the SGCM.

Hybrid Battery Pack Voltage Low

1. If DTC is history, refer to Testing for Intermittent Conditions and Poor Connections .
2. Gain access to the hybrid battery pack. Refer to Hybrid Battery Service Disconnect/Connect .
3. Ignition OFF, test battery pack voltage for greater than 22 volts.

⇒	If less than the specified value, replace the battery pack.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.