AutoCodes – Cadillac – P0AC1 Cadillac

P0AC1 Cadillac Code - Hybrid/EV Battery Low Resolution Current Sensor Circuit Low 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: P0AC1 Cadillac indicates Hybrid/EV Battery Low Resolution Current Sensor Circuit Low 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 862

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 P0AC1 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 P0AC1 Cadillac - Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage - AutoCodes.com — P0AC1 Cadillac Code - Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0AC1 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 P0AC1 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 P0AC1 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 P0AC1 Cadillac Code

1. What are the common symptoms of OBDII code P0AC1 in a Cadillac Hybrid/EV?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and illuminated check engine light.

2. What does the OBDII code P0AC1 indicate in a Cadillac Hybrid/EV?

- The code P0AC1 indicates a low voltage condition in the current sensor circuit of the hybrid/EV battery.

3. What are the possible causes of OBDII code P0AC1 in a Cadillac Hybrid/EV?

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

4. How can I diagnose the OBDII code P0AC1 in my Cadillac Hybrid/EV?

- Diagnosing the code typically involves using a scan tool to read the code, checking the voltage levels in the current sensor circuit, inspecting wiring and connectors, and testing the hybrid/EV battery.

5. Can I continue driving my Cadillac with OBDII code P0AC1 present?

- It is not recommended to drive the vehicle with the code present, as it can lead to further damage to the hybrid/EV system and may affect vehicle performance.

6. How can I repair OBDII code P0AC1 in my Cadillac Hybrid/EV?

- Repairing the code may involve replacing the faulty current sensor, repairing damaged wiring or connectors, addressing battery voltage issues, or seeking professional assistance for hybrid/EV battery repairs.

7. Are there any DIY tips for troubleshooting OBDII code P0AC1 in a Cadillac Hybrid/EV?

- DIY tips may include checking for loose or damaged wiring, ensuring proper battery connections, and performing a visual inspection of the current sensor circuit components.

8. Can a low-resolution current sensor circuit low voltage issue be related to other hybrid/EV system problems?

- Yes, a low voltage condition in the current sensor circuit can impact the overall performance and efficiency of the hybrid/EV system, potentially causing related issues with battery management and power delivery.

9. How long does it usually take to repair OBDII code P0AC1 in a Cadillac Hybrid/EV?

- The repair time can vary depending on the specific cause of the code and the complexity of the repair needed. It is recommended to consult a professional for a more accurate estimate.

10. Is it necessary to reset the OBDII system after repairing code P0AC1 in a Cadillac Hybrid/EV?

- Yes, it is recommended to clear the OBDII system after repairing the code to ensure the check engine light is reset and to monitor if the issue reoccurs.