AutoCodes – Cadillac – P0AC2 Cadillac

P0AC2 Cadillac 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 Cadillac 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 1,157

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

What does this mean?

What are the Possible Causes of the DTC P0AC2 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

What does the OBDII code P0AC2 mean for a Cadillac?

The OBDII code P0AC2 indicates a problem with the hybrid/EV battery low resolution current sensor circuit, specifically that it is reporting high voltage.

What symptoms might indicate a P0AC2 code?

Common symptoms include warning lights on the dashboard, reduced power during acceleration, and potential issues with the hybrid battery's performance.

What could cause the P0AC2 code to trigger?

Causes may include a faulty current sensor, damaged wiring or connectors in the battery management system, or issues with the hybrid battery itself.

How can I diagnose a P0AC2 code?

Begin by using an OBDII scanner to confirm the code. Inspect the battery current sensor wiring and connectors for damage, and test the sensor for proper functionality.

What repairs can fix the P0AC2 code?

Repairs may involve replacing the faulty current sensor, repairing damaged wiring or connectors, or addressing any underlying issues with the hybrid battery.

Is it safe to drive a vehicle with a P0AC2 code?

While it may be drivable, it is not recommended, as the vehicle may experience reduced performance and could potentially lead to further issues if the problem is not addressed.

How much does it typically cost to fix a P0AC2 code?

Repair costs can vary widely depending on the underlying issue, but it may range from $100 to over $1,000, depending on whether a sensor or wiring needs replacement.

Can I clear the P0AC2 code without fixing the issue?

Yes, you can clear the code with an OBDII scanner, but it is advisable to fix the underlying problem to prevent the code from returning.

Will a P0AC2 code affect my vehicle's fuel efficiency?

Yes, a P0AC2 code can lead to reduced fuel efficiency, as the hybrid system may not operate optimally when there are issues with the battery management system.