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P0AC2





DTC P0AC1, P0AC2, P1A07, or P1EBA

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 Descriptor

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

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

DTC P1A07
- Battery Energy Control Module 5V Reference Circuit

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

Diagnostic Fault Information






Circuit/System Description

The Battery Energy Control Module uses a single battery current sensor to determine the current flow out of the Hybrid/EV Battery Pack. The Battery Energy Control Module applies 5 volts and provides a low reference to power the sensor. Current measurement is communicated to the Battery Energy Control Module via a signal circuit.

Conditions for Running the DTC

P0AC1, P0AC2

* 12 V battery voltage is greater than 8.8 V

* Battery energy control module is awake and communicating

* DTC P1A07 is not set.

P1A07

* 12 V battery voltage is greater than 8.8 V

* Battery energy control module is awake and communicating

P1EBA

* 12 V battery voltage is greater than 8.8 V

* Battery energy control module is awake and communicating

* Contactors are open

* DTC P1A07 is not set.

Conditions for Setting the DTC

P0AC1

Current sensor signal voltage is less than 0.2 V

P0AC2

Current sensor signal voltage is greater than 4.8 V

P1A07

* Current sensor 5 volt reference voltage is greater than 5.2 V

* Current sensor 5 volt reference voltage is less than 4.8 V

P1EBA

* Current sensor value is more than 2.43 V greater than sensor offset upper limit

* Current sensor value is more than 2.57 V less than sensor offset lower limit

Action Taken When the DTC Sets

DTC P0AC1, P0AC2, P1A07, and P1EBA are type B DTCs

Conditions for Clearing the DTC

DTC P0AC1, P0AC2, P1A07, and P1EBA are type B DTCs

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-48900 - HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification

1. Ignition ON.

2. Verify the scan tool Hybrid/EV Battery Pack Low Resolution Current Sensor parameter is between 85 A and -85 A and varies as the vehicle is driven.

• If not between 85 A and -85 A or does not vary
Refer to Circuit/System Testing.

• If between 85 A and -85 A and varies

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. Connect the 12 V battery.

3. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B30 Hybrid/EV Battery Pack Current Sensor. It may take up to 2 minutes for all vehicle systems to power down.

4. Test for less than 10 ohms between the low reference circuit terminal 3 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K16 Battery Energy Control Module.

2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K16 Battery Energy Control Module.

• If less than 10 ohms

5. Ignition ON.

6. Test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and ground.

• If less than 4.8 V

1. Ignition OFF, disconnect the harness connector at the K16 Battery Energy Control Module.

2. Test for infinite resistance between the 5 V reference circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the 5 V reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K16 Battery Energy Control Module.

• If greater than 5.2 V

1. Ignition OFF, disconnect the harness connector at the K16 Battery Energy Control Module, ignition ON.

2. Test for less than 1 V between the 5 V reference circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K16 Battery Energy Control Module.

• If between 4.8-5.2 V

7. Verify the scan tool Hybrid/EV Battery Pack Low Resolution Current Sensor parameter is greater than 25 A.

• If 25 A or less

1. Ignition OFF, disconnect the harness connector at the K16 Battery Energy Control Module.

2. Test for infinite resistance between the signal circuit terminal 4 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K16 Battery Energy Control Module.

• If greater than 50 A

8. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 3.

9. Verify the scan tool Hybrid/EV Battery Pack Low Resolution Current Sensor parameter is less than -25 A.

• If -25 A or greater

1. Ignition OFF, disconnect the harness connector at the K16 Battery Energy Control Module, ignition ON.

2. Test for less than 1 V between the signal circuit terminal 4 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

3. Ignition ON.

4. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K16 Battery Energy Control Module.

• If less than -25 A

10. Test or replace the B30 Hybrid/EV Battery Pack Current Sensor.

Repair Instructions

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

* 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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