GM Service Manual Online
For 1990-2009 cars only

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 Descriptors

DTC P0ABC: Hybrid Battery Voltage Sensor Circuit Low Voltage

DTC P0ABD: Hybrid Battery Voltage Sensor Circuit High Voltage

Circuit/System Description

The generator battery disconnect control module monitors the hybrid battery pack voltage sensor for circuit 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

The hybrid system is disabled.

Conditions for Clearing the DTC

The hybrid battery pack voltage operates inside the calibrated threshold range.

Reference Information

Schematic Reference

Hybrid Energy Storage Schematics

Connector End View Reference

Hybrid Energy Storage Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Scan Tool Data List

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: In order to avoid damaging the generator battery disconnect control module C1 and C2 connector terminals, the proper test probes should be used. The proper test probes are as follows:

    • 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 C1 from the generator battery disconnect control module. Refer to Hybrid Battery Service Disconnect/Connect.
  3. Test for less than 6.5 volts between C1 terminal 1 and terminal 12.
  4. If greater than the specified range, replace the generator battery disconnect control module.
  5. Test for 1.3-1.7 kohms between C1 terminal 1 and Generator Battery 1- C1.
  6. If not within the specified range, replace the harness assembly.
  7. Test for 1.3-1.7 kohms between C1 terminal 12 and Generator Battery 3- C2.
  8. If not within the specified range, replace the harness assembly.

P0ABD

  1. Verify DTC P0ABD is set as current.
  2. Disconnect harness connector C1 from the generator battery disconnect control module. Refer to Hybrid Battery Service Disconnect/Connect.
  3. Test for less than 58.5 volts between C1 terminal 1 and terminal 12.
  4. If less than the specified range, replace the generator battery disconnect control module.
  5. Test for 1.3-1.7 kohms between C1 terminal 1 and Generator Battery 1- C1.
  6. If not within the specified range, replace the harness assembly.
  7. Test for 1.3-1.7 kohms between C1 terminal 12 and Generator Battery 3- C2.
  8. If not within the specified range, replace the harness assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Generator Battery Temperature Sensor Wiring Harness Replacement
    •  Control Module References for generator battery disconnect control module replacement, setup, and programming