AutoCodes – Buick – P0AC2 Buick

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

Quick Answer

The hybrid/EV battery current sensor is mounted inside the hybrid/EV battery pack. Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0AC2 Buick indicates Hybrid/EV Battery Low Resolution Current Sensor Circuit High Voltage.
Common causes: Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 856

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0AC2 Buick 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.

OBDII Code P0AC2 Buick - Hybrid/EV Battery Low Resolution Current Sensor Circuit High Voltage - AutoCodes.com — P0AC2 Buick Code - Hybrid/EV Battery Low Resolution Current Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0AC2 Buick?

Faulty Battery Energy Control Module
Battery Energy Control Module harness is open or shorted
Battery Energy Control Module circuit poor electrical connection

How to Fix the DTC P0AC2 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0AC2 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0AC2 Buick Code

1. What are the common symptoms of OBDII code P0AC2 in a Buick Hybrid/EV?

- Common symptoms include reduced hybrid/EV system performance, illuminated warning lights (such as the check engine light), and potential issues with battery charging.

2. What could be causing the Hybrid/EV Battery Low Resolution Current Sensor Circuit High Voltage code in a Buick?

- Possible causes may include a faulty current sensor, damaged wiring or connectors in the sensor circuit, or issues with the hybrid/EV battery system.

3. How serious is the P0AC2 code in a Buick Hybrid/EV?

- This code should be addressed promptly to prevent potential damage to the hybrid/EV battery system and ensure the vehicle operates at optimal performance.

4. Can I continue driving my Buick with the P0AC2 code present?

- It is not recommended to continue driving the vehicle with this code active, as it can lead to further complications and potential safety hazards.

5. How can I diagnose and repair the Hybrid/EV Battery Low Resolution Current Sensor Circuit High Voltage issue in my Buick?

- Diagnosis typically involves using a scan tool to read the code and inspecting the current sensor circuit, connectors, and battery components. Repair may involve replacing the current sensor or repairing damaged wiring.

6. Will resetting the OBDII code P0AC2 in my Buick make the problem go away?

- Resetting the code without addressing the underlying issue will not fix the problem. It is crucial to diagnose and repair the root cause of the code to prevent it from reoccurring.

7. Are there any DIY tips for troubleshooting the P0AC2 code in a Buick Hybrid/EV?

- DIYers can start by checking for loose connections, inspecting the sensor circuit for visible damage, and ensuring the hybrid/EV battery system is functioning properly. However, professional diagnosis may be required for accurate repair.

8. How much can I expect to pay for repairs related to the OBDII code P0AC2 in a Buick Hybrid/EV?

- Repair costs can vary depending on the extent of the issue and the specific components that need to be replaced. It is advisable to consult with a qualified mechanic for an accurate estimate.

9. Can extreme weather conditions affect the occurrence of the P0AC2 code in a Buick Hybrid/EV?

- Extreme temperatures or weather conditions can potentially impact the performance of the hybrid/EV battery system and trigger issues related to the current sensor circuit, leading to the P0AC2 code.

10. Is it necessary to take my Buick to a dealership for repairs related to the Hybrid/EV Battery Low Resolution Current Sensor Circuit High Voltage code?

- While a dealership may have specialized knowledge and tools for hybrid/EV systems, independent auto repair shops with experience in hybrid vehicles can often diagnose and repair the issue effectively.