P0ABD

DTC P0ABC or P0ABD

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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 pack voltage circuit for faults.

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.

Special Tools

J 35616 GM Approved Terminal Test Kit

Circuit/System Testing

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.

Important: 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.
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.
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 after completing the diagnostic procedure. Verification Tests

* Generator Battery Temperature Sensor Wiring Harness Replacement