P0ABB
DTC P0ABB, P0ABC, or P0ABD
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0ABB
-
Hybrid Battery Voltage Sensor Performance
DTC P0ABC
-
Hybrid Battery Voltage Sensor Circuit Low Voltage
DTC P0ABD
-
Hybrid Battery Voltage Sensor Circuit High Voltage
Circuit/System Description
The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 118 V DC. The battery cells are grouped together into two sections, each with 16 cell groups.
The battery energy control module monitors the voltage of the 32 battery cell groups. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery pack. The battery energy control module also monitors the hybrid battery pack voltage in it's entirety. The battery energy control module compares the voltage of the entire pack to that of the sum of the voltages measures at each cell.
Diagnostics and system status are communicated from the battery energy control module to hybrid powertrain control module through serial data.
Conditions for Running the DTC
P0ABB
None of the following DTCs are set: P0ABC, P0ABD, P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, P0B9C, P0BA1, P0BA6, P0BAB, P0BB0, P0BB5, P0BBA, P1B17, P1B1A, P1B1D, P1B20, P1B23, P1B26, P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, P0B9D, P0BA2, P0BA7, P0BAC, P0BB1, P0BB6, P0BBB, P1B18, P1B1B, P1B1E, P1B21, P1B24, P1B27, P0B3B, P0B40, P0B45, P0B4A, P0B4F, P0B54, P0B59, P0B5E, P0B63, P0B68, P0B6D, P0B72, P0B77, P0B7C, P0B81, P0B86, P0B8B, P0B90, P0B95, P0B9A, P0B9F, P0BA4, P0BA9, P0BAE, P0BB3, P0BB8, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D, P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0BA0, P0BA5, P0BAA, P0BAF, P0BB4, P0BB9, P1B16, P1B19, P1B1C, P1B1F, P1B22, P1B25.
P0ABC or P0ABD
* Battery voltage is greater than 9.6 V.
* Battery energy control module is awake and communicating.
Conditions for Setting the DTC
P0ABB
The calculated battery pack voltage based on the average cell voltage values is more than 5.49 V different than the actual measured battery pack voltage.
P0ABC
The battery pack voltage is less than 30 V.
P0ABD
The battery pack voltage is greater than 190 V.
Action Taken When the DTC Sets
* DTCs P0ABB, P0ABC, and P0ABD are type B DTCs.
* The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur.
Conditions for Clearing the DTC
DTCs P0ABB, P0ABC, and P0ABD are type B DTCs.
Diagnostic Aids
Opening the service disconnect without first disconnecting the 12 V battery or reconnecting the 12 V battery while the service disconnect is open may result in the setting of DTC P0ABB or P0ABC. Due to the nature of the hybrid battery pack design, the vehicle's 12 V electrical system will continue to discharge the high voltage battery, even though the service disconnect is open. This will eventually lower the voltage of the hybrid battery pack and set DTC P0ABB or P0ABC. If this occurs, close the service disconnect and operate the vehicle as normal. The hybrid battery pack will be charged and the voltage will return to normal.
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Drive Motor Battery System Description Drive Motor Battery System Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Special Tools
EL-48900 - HEV Safety Kit
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
Danger:
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
* Identify how to disable high voltage.
* Identify how to test for the presence of high voltage.
* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
* Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.
* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
- Visually and functionally inspect the gloves before use.
- Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.
Failure to follow the procedures exactly as written may result in serious injury or death.
Danger:
The eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information♦(SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
1. Ignition ON.
2. Verify the 12 V battery is not connected while the service disconnected is open.
• If the 12 V battery is connected and the service disconnect is open
It is normal to set DTC P0ABB or P0ABC when the service disconnect is open and the 12 V battery is connected. After service is complete, return the vehicle to it's normal state, close the service disconnect, connect the 12 V battery, and clear all DTCs.
• If the 12 V battery is connected and the service disconnect is closed
3. Verify DTC P0ABB, P0ABC, or P0ABD is not set.
• If any of the DTCs are set
Note:
In High Voltage Disabling High Voltage Disabling , perform the disabling procedure for servicing components within the A4 hybrid/EV battery pack. The C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2 will be disconnected as part of the disabling procedure.
1. Ignition OFF, disable high voltage at the A4 hybrid battery pack. Refer to High Voltage Disabling High Voltage Disabling.
2. Verify the battery energy control module high voltage measuring harness is not cut, chafed, or otherwise damaged.
• If the harness is damaged, replace the harness.
• If the harness is not damaged
3. Replace the K16 battery energy control module
• If none of the DTCs are set
4. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Battery Energy Control Module Wiring Harness Replacement (BDU,BECM and BPIM) Battery Energy Control Module Wiring Harness Replacement (BDU,BECM and BPIM)Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2) Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2)
* Control Module References Programming and Relearning for battery energy control module replacement, programming, and setup