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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 Instructionsprovides 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

Diagnostic Fault Information






Circuit/System Description

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred to as the hybrid battery.

The drive motor generator battery control module has several methods of monitoring the total voltage values of the hybrid batteries. The drive motor generator battery control module monitors the calculated battery voltage and the terminal voltage. The calculated voltage represents the sum of the voltages from the 20 individual battery measurements, and the terminal voltage represents the total DC bus voltage as measured on the output side of the high voltage contactor. The drive motor generator battery control module compares these two voltage readings and looks for a difference. The drive motor generator battery control module also monitors the terminal voltage for both over voltage and under voltage conditions.

Conditions for Running the DTC

* The ignition is ON.
* The 12 V battery voltage is 9-18 V.
* The high voltage contactors are closed.

Conditions for Setting the DTC

P0ABB

The drive motor generator battery control module detects a 50 V difference between the hybrid battery pack calculated voltage and the hybrid battery terminal voltage for 7 seconds.

P0ABC

The drive motor generator battery control module detects the terminal voltage is less than 50 V for 3 seconds.

P0ABD

The drive motor generator battery control module detects the terminal voltage is greater than 430 V for 3 seconds.

Action Taken When the DTC Sets

* DTCs P0ABB, P0ABC, and P0ABD are type A DTCs.
* The battery vent fan is commanded to high speed.

Conditions for Clearing the DTC

DTCs P0ABB, P0ABC, and P0ABD are type A DTCs.

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 Relearningfor scan tool information
Special Tools

* EL-48571 High Voltage Battery Pin Out Box
* EL-48900 HEV Safety Kit

Circuit/System Verification

1. Verify that DTCs P0A95, P0C77, and P1A20 is not set.

• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

2. Verify that DTC P0ABD is not set.

• If the DTC is set, replace the drive motor generator battery assembly. If the DTC resets, replace the drive motor generator battery control module.

3. Ignition ON, engine OFF, observe the scan tool Hybrid Battery Pack Calculated and Hybrid Battery Terminal parameters. The readings should be between 169 and 408 V and should be within 50 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.


Failure to follow the procedures exactly as written may result in serious injury or death.


1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling High Voltage Disabling.
2. Connect the 12 V battery.

Note: The following tests require wearing personal protection equipment (PPE) gloves.

3. Ignition ON, engine OFF, command the high voltage negative contactor closed with a scan tool. Test for less than 0.5 ohm between the high voltage negative contactor terminals X2 and X3.

• If greater than the specified range, replace the negative contactor relay.

4. Command the high voltage positive contactor closed with a scan tool. Test for less than 0.5 ohm between the high voltage positive contactor terminals X2 and X3.

• If greater than the specified range, replace the positive contactor relay.

5. Ignition OFF, test for less than 5 ohm between the high voltage negative contactor terminal X2 and the drive motor generator battery negative terminal.

• If greater than the specified range, replace the drive motor negative relay cable.

6. Test for less than 5 ohm between the high voltage positive contactor terminal X2 and drive motor generator battery positive terminal.

• If greater than the specified range, replace the drive motor positive relay cable.

7. Disconnect the X5 harness connector at the drive motor generator battery control module.
8. Test for less than 5 ohm between the high voltage negative contactor terminal X3 and the ground terminal 5 X5.

• If greater than the specified range, replace the drive motor battery positive and negative cable.

9. Test for less than 5 ohm between the high voltage positive contactor terminal X3 and drive motor generator battery control module terminal 1 X5.

• If greater than the specified range, replace the drive motor positive and negative cable.

10. Disconnect the X4 harness connector at the drive motor generator battery control module.
11. Connect the EL-48571 high voltage battery pin out box.
12. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
13. Each battery voltage reading should be between 10-19 V.

• If not within the specified range, replace the drive motor battery assembly.

14. Each battery voltage reading should be within 1.5 V of each other.

• If not within the specified range, replace the drive motor battery assembly.

15. If all circuits test normal, replace the drive motor generator battery control module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Drive Motor Battery Negative High Voltage Contactor Relay Replacement Drive Motor Battery Negative High Voltage Contactor Relay Replacement
* Drive Motor Battery Positive High Voltage Contactor Relay Replacement Drive Motor Battery Positive High Voltage Contactor Relay Replacement
* Drive Motor Battery Positive and Negative Cable Replacement Drive Motor Battery Positive and Negative Cable Replacement
* Drive Motor Battery Replacement and Shipping Preparation Procedures
* Control Module References Programming and Relearningfor drive motor generator battery control replacement, setup and programming

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