P0ABC

DTC P0ABC or P0ABD

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.

DTC Descriptors
DTC P0ABC
- Hybrid Battery Voltage Sensor Circuit Low Voltage

DTC P0ABD
- Hybrid Battery Voltage Sensor Circuit High Voltage

Circuit/System Description

The battery energy control module (BECM) monitors the hybrid system voltage using the internal voltage sensor, this DTC sets when the sensor voltage is not within the calibrated range.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

P0ABC

Pack Voltage raw A/D less than 0.5 volt

P0ABD

Pack Voltage raw A/D greater than 4.5 volts

Action Taken When the DTC Sets

Hybrid system is inactive.

Conditions for Clearing the DTC

Pack voltage operates inside the threshold range.

Reference Information
Schematic Reference

Hybrid Energy Storage Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Generator Battery Carrier Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information
Special Tools

J 35616 GM Approved Terminal Test Kit

Circuit/System Testing

Warning

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.

Warning

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.

Note: Use the following list to identify the appropriate terminals to test:

* J-35616-65B for female terminals
* J-35616-64B for male terminals

P0ABC
1. Verify DTC P0ABC is set as current.
2. Disconnect harness connector X1 from the BECM. Refer to Hybrid Battery Service Disconnect/Connect (Procedures).
3. Test for less than 6.5 volts between X1 terminal 1 and terminal 12.

• If greater than the specified range, replace the BECM.

4. Test for 1.3-1.7k ohms between X1 terminal 1 and Generator Battery 1- X1.

• If not within the specified range, replace the harness assembly.

5. Test for 1.3-1.7k ohms between X1 terminal 12 and Generator Battery 3- X2.

• If not within the specified range, replace the harness assembly.

P0ABD
1. Verify DTC P0ABD is set as current.
2. Disconnect harness connector X1 from the BECM. Refer to Hybrid Battery Service Disconnect/Connect (Procedures).
3. Test for less than 58.5 volts between terminal 1 and terminal 12.

• If greater than the specified range, replace the BECM.

4. Test for 1.3-1.7k ohms between X1 terminal 1 and Generator Battery 1- X1.

• If not within the specified range, replace the harness assembly.

5. Test for 1.3-1.7k ohms between X1 terminal 12 and Generator Battery 3- X2.

• If not within the specified range, replace the harness assembly.

Repair Instructions

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

* Generator Battery Temperature Sensor Wiring Harness Replacement (Generator Battery Temperature Sensor Wiring Harness Replacement)
* Control Module References (Programming and Relearning)for BECM replacement, setup, and programming