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Home >> Chevrolet >> 2012 >> Volt L4-1.4L Elect >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1EBA

P1EBA




DTC P0AC1, P0AC2, P0B10, P0B11, P0B13, P1EBA, or P1EBB

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 P0AC1
- Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage

DTC P0AC2
- Hybrid/EV Battery Low Resolution Current Sensor Circuit High Voltage

DTC P0B10
- Hybrid/EV Battery High Resolution Current Sensor Circuit Low Voltage

DTC P0B11
- Hybrid/EV Battery High Resolution Current Sensor Circuit High Voltage

DTC P0B13
- Hybrid/EV Battery Low Resolution Current Sensor High Resolution Current Sensor Not Plausible

DTC P1EBA
- Hybrid/EV Battery Low Resolution Current Sensor Exceeded Learning Limit

DTC P1EBB
- Hybrid/EV Battery High Resolution Current Sensor Exceeded Learning Limit

Circuit/System Description

The hybrid/EV battery current sensor is mounted inside the hybrid/EV battery pack. The positive high voltage cable that goes to the positive contactor relay passes through the hybrid/EV battery pack current sensor. The hybrid/EV battery pack current sensor detects the amperage that flows in and out of the hybrid/EV batteries. The battery energy control module supplies and monitors a 5 V reference signal to the hybrid/EV battery pack current sensor. The hybrid/EV battery pack current sensor returns a signal between 0 and 5 V to the battery energy control module. The hybrid/EV battery pack current sensor signal is in proportion to the amperage going in and out of the hybrid/EV battery pack. A signal voltage of the hybrid/EV battery pack current sensor greater than 2.5 V indicates that the hybrid/EV battery is being charged and a signal voltage less than 2.5 V indicates discharging. The hybrid/EV battery pack current sensor has 2 measurement ranges in order to maintain accuracy. The ranges are low resolution and high resolution. The measurement ranges of the hybrid/EV battery pack current sensor have some overlap with each other. The high resolution measures from -23 to +23 A. The low resolution measures from -470 to +280 A.

Conditions for Running the DTC

P0AC1, P0AC2, P0B10, and P0B11
* The 12 V battery voltage is greater than or equal to 9 V.
* The battery energy control module is awake and communicating.
* DTC P1A07 is not set.

P0B13
* The hybrid/EV battery low resolution current sensor or the hybrid/EV battery high resolution current sensor value is between -20 and +20 A.
* None of the following DTCs are set: P0AC1, P0AC2, P1EBA, P1A07, P0B10, P0B11, P1EBB.

P1EBA and P1EBB
* Runs during battery energy control module initialization.
* The 12 V battery voltage is greater than or equal to 9 V.
* The high voltage main and charger contactors are open (during wake-up).
* DTC P1A07 is not set.

Conditions for Setting the DTC

P0AC1

The battery energy control module detects that the hybrid/EV battery pack current sensor low resolution is less than -470 A.

P0AC2

The battery energy control module detects that the hybrid/EV battery pack current sensor low resolution is greater than +280 A.

P0B10

The battery energy control module detects that the hybrid/EV battery pack current sensor high resolution is less than -23 A.

P0B11

The battery energy control module detects that the hybrid/EV battery pack current sensor high resolution is greater than +23 A.

P0B13

The difference between the Hybrid/EV Battery's low resolution current sensor value and its high resolution current sensor value is greater than 10 A.

P1EBA

The battery energy control module detects that the Pack Current Low Resolution Offset is greater than the calibration Low Resolution Offset of 8 A.

P1EBB

The battery energy control module detects that the Pack Current High Resolution Offset is greater than the calibration High Resolution Offset of 2.5 A.

Action Taken When the DTC Sets

* DTC P0AC1, P0AC2, P0B10, P0B11, P1EBA and P1EBB are type A DTCs.
* The driver information center (DIC) displays the SERVICE HYBRID SYSTEM message.
* If any of these DTCs are set, the vehicle will operate in a reduced power mode and electric only engine ON.
* The contactors may open at any time.

Conditions for Clearing the DTC

DTC P0AC1, P0AC2, P0B10, P0B11, P1EBA and P1EBB are type A DTCs.

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
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
* EL-50211 - Low Voltage Jumper Harness Extension

For equivalent regional tools, refer to Special Tools Tools and Equipment.

Circuit/System Verification

Vehicle in Service Mode, observe the scan tool Hybrid/EV Battery Pack Low Resolution Current Sensor parameter. The reading should be between -470 and +280 A, and change with the amount of current draw on the hybrid/EV battery pack. Observe the scan tool Hybrid/EV Battery Pack High Resolution Current Sensor parameter. The reading should be between -23 and +23 A, and change with the amount of current draw on the hybrid/EV battery pack. Typical current sensor reading in a parked vehicle with the Vehicle in Service Mode and all accessories OFF, is between 1 and 10 A.

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 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 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. Vehicle OFF, disable the high voltage at the A4 hybrid/EV battery pack. Refer to High Voltage Disabling High Voltage Disabling.
2. Connect the EL-50211 - low voltage jumper harness extension.
3. Disconnect the harness connector at the B30 hybrid/EV battery pack current sensor.
4. Test for less than 10 ohm between the low reference circuit terminal C and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K16 battery energy control module.

5. Connect the 12 V battery.
6. Vehicle in Service Mode, test for 4.8-5.5 V between the 5 V reference circuit terminal B and ground.

• If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K16 battery energy control module.
• If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K16 battery energy control module.

7. Verify the scan tool Hybrid/EV Battery Pack High Resolution Current Sensor parameter is less than -0.5 A.

• If greater than the specified range, test the signal circuit terminals D for a short to voltage. If the circuit tests normal, replace the K16 battery energy control module.

8. Install a 3 A fused jumper wire between the signal circuit terminal D and the 5 V reference circuit terminal B. Verify the scan tool Hybrid/EV Battery Pack High Resolution Current Sensor parameter is greater than 0.5 A.

• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K16 battery energy control module.

9. Verify the scan tool Hybrid/EV Battery Pack Low Resolution Current Sensor parameter is less than 100 A.

• If greater than the specified range, test the signal circuit terminal A for a short to voltage. If the circuit tests normal, replace the K16 battery energy control module.

10. Install a 3 A fused jumper wire between the signal circuit terminal A and the 5 V reference circuit terminal B. Verify the scan tool Hybrid/EV Battery Pack Low Resolution Current Sensor parameter is greater than 100 A.

• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K16 battery energy control module.

11. If all circuits test normal, replace the B30 hybrid/EV battery pack current sensor.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Drive Motor Battery Current Sensor Replacement Drive Motor Battery Current Sensor Replacement
* Battery Energy Control Module Wiring Harness Replacement Battery Energy Control Module Wiring Harness Replacement
* Control Module References Programming and Relearning for battery energy control module replacement, programming and setup

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