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/EV Battery Voltage Sensor Circuit Performance
DTC P0ABC
- Hybrid/EV Battery Voltage Sensor Circuit Low Voltage
DTC P0ABD
- Hybrid/EV Battery Voltage Sensor Circuit High Voltage
Circuit/System Description
The drive motor battery contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the drive motor battery assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 volts, for a nominal system voltage of 355 volts direct current. The battery cells are also grouped together into three sections. The first 90 cells / 30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through 96. Battery section two is located behind section one. It is made up of 72 cells / 24 cell groups and contains batteries 43 through 66. The transverse battery section is section number three, it is made up of the remaining 126 cells / 42 cell groups and contains batteries 1 through 42. The three battery sections are individually serviceable components.
The hybrid powertrain control module 2 monitors individual cell voltage readings from the battery energy control module. The battery energy control module monitors the voltage of the 96 battery cell groups. Voltage sense lines are attached to each individual cell group, and these sense lines terminate at a connector located on the top surface of the battery section. A serviceable voltage sense harness joins this connector to a drive motor battery high voltage interface control module, also located on the top surface of the battery section. The drive motor battery high voltage interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one drive motor battery high voltage interface control module located on battery sections one and two, and two drive motor battery high voltage interface control modules associated with battery section three. The drive motor battery high voltage interface control module, voltage sense harnesses, battery control harness and battery energy control module are all considered serviceable components.
Conditions for Running the DTC
P0ABB
* The hybrid powertrain control module 2 and battery energy control module is awake and communicating.
* DTC U0111 or U185A is not set.
P0ABC and P0ABD
* The hybrid powertrain control module 2 and battery energy control module is awake and communicating.
* The system voltage is greater than or equal to 9 V.
* DTC P1A07 is not set.
Conditions for Setting the DTC
P0ABB
The hybrid powertrain control module detects difference of 10 V between the average cell group voltage multiplied by 96 and the voltage measured at battery side of the main contactors.
P0ABC
The battery energy control module detects the terminal voltage is less than 24 V on the battery side of the main contactors.
P0ABD
The battery energy control module detects the terminal voltage is greater than 456 V on the battery side of the main contactors.
Action Taken When the DTC Sets
DTCs P0ABB, P0ABC, and P0ABD are type B DTCs.
Conditions for Clearing the DTC
DTCs P0ABB, P0ABC, and P0ABD are type B DTCs.
Diagnostic Aids
The manual service disconnect is out, not installed correctly, or a blown manual service disconnect fuse will cause P0ABB and/or P0ABC to set.
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics Hybrid Energy Storage Schematics
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1 A4
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 Control Module References for scan tool information
Special Tools
EL-48900 - HEV Safety Kit
Circuit/System Verification
Ignition ON, engine OFF, observe the scan tool Hybrid Battery Pack Terminal 1 Voltage, Hybrid Battery Pack Terminal 2 Voltage, and Hybrid Battery Pack Voltage parameters. The readings should be between 288-393.6 V, and should be within 10 V of each other.
Circuit/System Testing
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 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 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 Volt Battery Pack will utilize an exchange program. Please consult the most recent revision of bulletin/PI #PIP4841, available in Service Information (SI), for a list of approved Volt Battery Pack service procedures. Components that may be removed and serviced without exchanging the complete battery pack are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
1. Ignition OFF, disable the high voltage. Refer to High Voltage Disabling High Voltage Disabling.
2. Disconnect X3 harness connector at the K16 battery energy control module.
3. Test for less than 10 ohm between the terminals listed below:
* Ground (300 V) N X16 at the A28 hybrid battery contactor assembly and the K16 battery energy control module terminal 4 X3
* B+ (300 V) P X16 at the A28 hybrid battery contactor assembly and the K16 battery energy control module terminal 1 X3
* The A28 hybrid battery contactor assembly terminal 2 X3 and K16 battery energy control module terminal 7 X3
* The A28 hybrid battery contactor assembly terminal 1 X3 and K16 battery energy control module terminal 10 X3
• If greater than the specified range, replace the A28 hybrid battery contactor assembly.
• If within the specified range, replace the K16battery energy control module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Drive Motor Battery Wire Junction Block Relay Replacement Drive Motor Battery Wire Junction Block Relay Replacement
* Control Module References Control Module References for battery energy control module replacement, programming and setup