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P0B7F





DTC P0B3B-P0BBB, P1B16-P1B2D, P1B3D, or P1B3E

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 P0B3B
- Hybrid/EV Battery 1 Circuit

DTC P0B3C
- Hybrid/EV Battery 1 Circuit Performance

DTC P0B3D
- Hybrid/EV Battery 1 Circuit Low Voltage

DTC P0B3E
- Hybrid/EV Battery 1 Circuit High Voltage

DTC P0B40
- Hybrid/EV Battery 2 Circuit

DTC P0B41
- Hybrid/EV Battery 2 Circuit Performance

DTC P0B42
- Hybrid/EV Battery 2 Circuit Low Voltage

DTC P0B43
- Hybrid/EV Battery 2 Circuit High Voltage

DTC P0B45
- Hybrid/EV Battery 3 Circuit

DTC P0B46
- Hybrid/EV Battery 3 Circuit Performance

DTC P0B47
- Hybrid/EV Battery 3 Circuit Low Voltage

DTC P0B48
- Hybrid/EV Battery 3 Circuit High Voltage

DTC P0B4A
- Hybrid/EV Battery 4 Circuit

DTC P0B4B
- Hybrid/EV Battery 4 Circuit Performance

DTC P0B4C
- Hybrid/EV Battery 4 Circuit Low Voltage

DTC P0B4D
- Hybrid/EV Battery 4 Circuit High Voltage

DTC P0B4F
- Hybrid/EV Battery 5 Circuit

DTC P0B50
- Hybrid/EV Battery 5 Circuit Performance

DTC P0B51
- Hybrid/EV Battery 5 Circuit Low Voltage

DTC P0B52
- Hybrid/EV Battery 5 Circuit High Voltage

DTC P0B54
- Hybrid/EV Battery 6 Circuit

DTC P0B55
- Hybrid/EV Battery 6 Circuit Performance

DTC P0B56
- Hybrid/EV Battery 6 Circuit Low Voltage

DTC P0B57
- Hybrid/EV Battery 6 Circuit High Voltage

DTC P0B59
- Hybrid/EV Battery 7 Circuit

DTC P0B5A
- Hybrid/EV Battery 7 Circuit Performance

DTC P0B5B
- Hybrid/EV Battery 7 Circuit Low Voltage

DTC P0B5C
- Hybrid/EV Battery 7 Circuit High Voltage

DTC P0B5E
- Hybrid/EV Battery 8 Circuit

DTC P0B5F
- Hybrid/EV Battery 8 Circuit Performance

DTC P0B60
- Hybrid/EV Battery 8 Circuit Low Voltage

DTC P0B61
- Hybrid/EV Battery 8 Circuit High Voltage

DTC P0B63
- Hybrid/EV Battery 9 Circuit

DTC P0B64
- Hybrid/EV Battery 9 Circuit Performance

DTC P0B65
- Hybrid/EV Battery 9 Circuit Low Voltage

DTC P0B66
- Hybrid/EV Battery 9 Circuit High Voltage

DTC P0B68
- Hybrid/EV Battery 10 Circuit

DTC P0B69
- Hybrid/EV Battery 10 Circuit Performance

DTC P0B6A
- Hybrid/EV Battery 10 Circuit Low Voltage

DTC P0B6B
- Hybrid/EV Battery 10 Circuit High Voltage

DTC P0B6D
- Hybrid/EV Battery 11 Circuit

DTC P0B6E
- Hybrid/EV Battery 11 Circuit Performance

DTC P0B6F
- Hybrid/EV Battery 11 Circuit Low Voltage

DTC P0B70
- Hybrid/EV Battery 11 Circuit High Voltage

DTC P0B72
- Hybrid/EV Battery 12 Circuit

DTC P0B73
- Hybrid/EV Battery 12 Circuit Performance

DTC P0B74
- Hybrid/EV Battery 12 Circuit Low Voltage

DTC P0B75
- Hybrid/EV Battery 12 Circuit High Voltage

DTC P0B77
- Hybrid/EV Battery 13 Circuit

DTC P0B78
- Hybrid/EV Battery 13 Circuit Performance

DTC P0B79
- Hybrid/EV Battery 13 Circuit Low Voltage

DTC P0B7A
- Hybrid/EV Battery 13 Circuit High Voltage

DTC P0B7C
- Hybrid/EV Battery 14 Circuit

DTC P0B7D
- Hybrid/EV Battery 14 Circuit Performance

DTC P0B7E
- Hybrid/EV Battery 14 Circuit Low Voltage

DTC P0B7F
- Hybrid/EV Battery 14 Circuit High Voltage

DTC P0B81
- Hybrid/EV Battery 15 Circuit

DTC P0B82
- Hybrid/EV Battery 15 Circuit Performance

DTC P0B83
- Hybrid/EV Battery 15 Circuit Low Voltage

DTC P0B84
- Hybrid/EV Battery 15 Circuit High Voltage

DTC P0B86
- Hybrid/EV Battery 16 Circuit

DTC P0B87
- Hybrid/EV Battery 16 Circuit Performance

DTC P0B88
- Hybrid/EV Battery 16 Circuit Low Voltage

DTC P0B89
- Hybrid/EV Battery 16 Circuit High Voltage

DTC P0B8B
- Hybrid/EV Battery 17 Circuit

DTC P0B8C
- Hybrid/EV Battery 17 Circuit Performance

DTC P0B8D
- Hybrid/EV Battery 17 Circuit Low Voltage

DTC P0B8E
- Hybrid/EV Battery 17 Circuit High Voltage

DTC P0B90
- Hybrid/EV Battery 18 Circuit

DTC P0B91
- Hybrid/EV Battery 18 Circuit Performance

DTC P0B92
- Hybrid/EV Battery 18 Circuit Low Voltage

DTC P0B93
- Hybrid/EV Battery 18 Circuit High Voltage

DTC P0B95
- Hybrid/EV Battery 19 Circuit

DTC P0B96
- Hybrid/EV Battery 19 Circuit Performance

DTC P0B97
- Hybrid/EV Battery 19 Circuit Low Voltage

DTC P0B98
- Hybrid/EV Battery 19 Circuit High Voltage

DTC P0B9A
- Hybrid/EV Battery 20 Circuit

DTC P0B9B
- Hybrid/EV Battery 20 Circuit Performance

DTC P0B9C
- Hybrid/EV Battery 20 Circuit Low Voltage

DTC P0B9D
- Hybrid/EV Battery 20 Circuit High Voltage

DTC P0B9F
- Hybrid/EV Battery 21 Circuit

DTC P0BA0
- Hybrid/EV Battery 21 Circuit Performance

DTC P0BA1
- Hybrid/EV Battery 21 Circuit Low Voltage

DTC P0BA2
- Hybrid/EV Battery 21 Circuit High Voltage

DTC P0BA4
- Hybrid/EV Battery 22 Circuit

DTC P0BA5
- Hybrid/EV Battery 22 Circuit Performance

DTC P0BA6
- Hybrid/EV Battery 22 Circuit Low Voltage

DTC P0BA7
- Hybrid/EV Battery 22 Circuit High Voltage

DTC P0BA9
- Hybrid/EV Battery 23 Circuit

DTC P0BAA
- Hybrid/EV Battery 23 Circuit Performance

DTC P0BAB
- Hybrid/EV Battery 23 Circuit Low Voltage

DTC P0BAC
- Hybrid/EV Battery 23 Circuit High Voltage

DTC P0BAE
- Hybrid/EV Battery 24 Circuit

DTC P0BAF
- Hybrid/EV Battery 24 Circuit Performance

DTC P0BB0
- Hybrid/EV Battery 24 Circuit Low Voltage

DTC P0BB1
- Hybrid/EV Battery 24 Circuit High Voltage

DTC P0BB3
- Hybrid/EV Battery 25 Circuit

DTC P0BB4
- Hybrid/EV Battery 25 Circuit Performance

DTC P0BB5
- Hybrid/EV Battery 25 Circuit Low Voltage

DTC P0BB6
- Hybrid/EV Battery 25 Circuit High Voltage

DTC P0BB8
- Hybrid/EV Battery 26 Circuit

DTC P0BB9
- Hybrid/EV Battery 26 Circuit Performance

DTC P0BBA
- Hybrid/EV Battery 26 Circuit Low Voltage

DTC P0BBB
- Hybrid/EV Battery 26 Circuit High Voltage

DTC P1B16
- Hybrid/EV Battery 27 Circuit Performance

DTC P1B17
- Hybrid/EV Battery 27 Circuit Low Voltage

DTC P1B18
- Hybrid/EV Battery 27 Circuit High Voltage

DTC P1B19
- Hybrid/EV Battery 28 Circuit Performance

DTC P1B1A
- Hybrid/EV Battery 28 Circuit Low Voltage

DTC P1B1B
- Hybrid/EV Battery 28 Circuit High Voltage

DTC P1B1C
- Hybrid/EV Battery 29 Circuit Performance

DTC P1B1D
- Hybrid/EV Battery 29 Circuit Low Voltage

DTC P1B1E
- Hybrid/EV Battery 29 Circuit High Voltage

DTC P1B1F
- Hybrid/EV Battery 30 Circuit Performance

DTC P1B20
- Hybrid/EV Battery 30 Circuit Low Voltage

DTC P1B21
- Hybrid/EV Battery 30 Circuit High Voltage

DTC P1B22
- Hybrid/EV Battery 31 Circuit Performance

DTC P1B23
- Hybrid/EV Battery 31 Circuit Low Voltage

DTC P1B24
- Hybrid/EV Battery 31 Circuit High Voltage

DTC P1B25
- Hybrid/EV Battery 32 Circuit Performance

DTC P1B26
- Hybrid/EV Battery 32 Circuit Low Voltage

DTC P1B27
- Hybrid/EV Battery 32 Circuit High Voltage

DTC P1B28
- Hybrid/EV Battery 27 Circuit

DTC P1B29
- Hybrid/EV Battery 28 Circuit

DTC P1B2A
- Hybrid/EV Battery 29 Circuit

DTC P1B2B
- Hybrid/EV Battery 30 Circuit

DTC P1B2C
- Hybrid/EV Battery 31 Circuit

DTC P1B2D
- Hybrid/EV Battery 32 Circuit

DTC P1B3D
- Hybrid/EV Battery Voltage Sense Low Reference 1 Circuit

DTC P1B3E
- Hybrid/EV Battery Voltage Sense Low Reference 2 Circuit

Circuit/System Description

The hybrid/EV 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/EV battery pack.

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

DTC P0B3B, P0B40, P0B45, P0B4A, P0B4F, P0B54, P0B59, P0B5E, P0B63, P0B68, P0B6D, P0B72, P0B77, P0B7C, P0B81, P0B86, P0B88, P0B90, P0B95, P0B9A, P0B9F, P0BA4, P0BA9, P0BAE, P0BB3, P0BB8, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D

* 12 V battery voltage is greater than 9 V.

* None of the following DTCs are set: 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, P1B33, P1B34, P1B35, P1B36, P1B37, P1B38, P1B39

DTC 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

All of the following conditions exist:

* Average cell voltage movement is greater than 0.045 V.

* DTC U182A is not set.

DTC P0B3D, P0B3E, P0B42, P0B43, P0B47, P0B48, P0B4C, P0B4D, P0B51, P0B52, P0B56, P0B57, P0B5B, P0B5C, P0B60, P0B61, P0B65, P0B66, P0B6A, P0B6B, P0B6F, P0B70, P0B74, P0B75, P0B79, P0B7A, P0B7E, P0B7F, P0B83, P0B84, P0B88, P0B89, P0B8D, P0B8E, P0B92, P0B93, P0B97, P0B98, P0B9C, P0B9D, P0BA1, P0BA2, P0BA6, P0BA7, P0BAB, P0BAC, P0BB0, P0BB1, P0BB5, P0BB6, P0BBA, P0BBB, P1B17, P1B18, P1B1A, P1A1B, P1B1D, P1B1E, P1B20, P1B21, P1B23, P1B24, P1B26, P1B27

* 12 V battery voltage is greater than 9 V.

* The battery energy control module is awake and communicating.

* None of the following DTCs are set: P1B34, P1B35, P1B36, P1B37, P1B38, P1B39

P1B3D, P1B3E

* 12 V battery voltage is greater than 8.8 V.

* None of the following DTCs are running: P1EAA, P1EAC.

* None of the following DTCs are set: P1B34, P1B35, P1B36, P1B37, P1B38, P1B39

Conditions for Setting the DTC

DTC P0B3B, P0B40, P0B45, P0B4A, P0B4F, P0B54, P0B59, P0B5E, P0B63, P0B68, P0B6D, P0B72, P0B77, P0B7C, P0B81, P0B86, P0B88, P0B90, P0B95, P0B9A, P0B9F, P0BA4, P0BA9, P0BAE, P0BB3, P0BB8, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D

The appropriate battery voltage sense circuit is open.

DTC 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

Measured individual battery cell voltage movement is not in the same direction as the average battery cell voltage movement.

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

Measured individual battery cell voltage is less than 1.4 V.

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

Measured individual battery cell voltage is greater than 4.65 V.

P1B3D

Cell sense voltage is less than 1.4 V.

AND

Battery 16 cell voltage change is greater than 0.5 V over a 200ms sample time.

P1B3E

Cell sense voltage is less than 1.4 V.

AND

Battery 32 cell voltage change is greater than 0.5 V over a 200ms sample time.

Action Taken When the DTC Sets

* DTC P0B3B-P0BBB, P1B16-1B2D, P1B3D, and P1B3E 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

DTC P0B3B-P0BBB, P1B16-1B2D, P1B3D, and P1B3E are type B DTCs.

Diagnostic Aids

The following two tables should be used to determine the switch setting when using the EL-48571-30 - High Voltage Battery Pin Out Box.










Reference Information

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

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-48571-30 - High Voltage Battery Pin Out Box

* EL-48900 - HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification

1. Ignition ON.

2. Verify that each of the scan tool Hybrid Battery Cell Voltage 1-32 parameters are between 3.0-4.1 V and all parameters are within 0.1 V of each other.

• If any parameter is not between 3.0-4.1 V or is not within 0.1 V of the others
Refer to Circuit/System Testing.

• If all parameter are between 3.0-4.1 V and are within 0.1 V of each other

3. All OK.

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 includes the following steps:


* 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 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.


Note: In 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/EV Battery Pack. Refer to High Voltage Disabling .

2. Disconnect the X4 and X5 harness connectors K16 Battery Energy Control Module.

3. Connect the EL-48571-30 - High Voltage Battery Pin Out Box to the appropriate K16 Battery Energy Control Module harness connector.

4. Insert the DMM probes into the EL-48571-30 test cavities.

Note:

* The DMM must be set to the DC voltage setting.

* Not all 24 switch positions of the EL-48571-30 will be used.

5. Measure and record the voltage of each of the cells by cycling the EL-48571-30 through each of the 16 switch positions.

6. Verify that each cell voltage reading is 3.0-4.1 V and all cell voltage readings are within 0.1 V of each other.

• If any parameter is not between 3.0-4.1 V or is not within 0.1 V of the others

1. Inspect the appropriate voltage signal circuit and low reference circuit for a short to ground or an open/high resistance.

• If a short to ground or an open/high resistance is found, replace the appropriate K16 Battery Energy Control Module high voltage measuring harness.

• If a short to ground or an open/high resistance is not found

2. Replace the C4A Hybrid/EV Battery Section 1 and C4B Hybrid/EV Battery Section 2.

• If all parameter are between 3.0-4.1 V and are within 0.1 V of each other

7. Replace the K16 Battery Energy Control Module.

Repair Instructions

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

* Generator Battery Replacement

* Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2) Battery Energy Control Module Wiring Harness Replacement (BDU,BECM and BPIM)

* Control Module References Control Module References for battery energy control module replacement, programming, and setup.

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