AutoCodes – Generic – P3023

P3023 Code - Battery Block 13 Becomes Weak

Quick Answer

If there is an abnormal internal resistance or electromotive voltage in the hybrid battery blocks, the hybrid battery Electronic Control Unit (ECU) determines that a malfunction has occurred. Common causes include Faulty HV battery assembly, Faulty Battery ECU. 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: P3023 indicates Battery Block 13 Becomes Weak.
Common causes: Common causes include Faulty HV battery assembly, Faulty Battery ECU.
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 10,201

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 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P3023 Description

If there is an abnormal internal resistance or electromotive voltage in the hybrid battery blocks, the hybrid battery Electronic Control Unit (ECU) determines that a malfunction has occurred. When the malfunction detection condition is satisfied, the battery ECU illuminates the MIL and sets a Diagnostic Trouble Code (DTC).

OBDII Code P3023 - Battery Block 13 Becomes Weak - AutoCodes.com — P3023 Code - Battery Block 13 Becomes Weak

What does this mean?

What are the Possible Causes of the DTC P3023?

Faulty HV battery assembly
Faulty Battery ECU

How to Fix the DTC P3023?

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 P3023 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.

Need more information about the P3023 code?

Need more information on how to fix the P3023 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P3023 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P3023 BMW — Upstream Oxygen Sensor Signal Controller Monitoring Communication Error Bank 2 Sensor 1
P3023 Lexus — Battery Block 13 Becomes Weak
P3023 MINI — Upstream Oxygen Sensor Signal Controller Monitoring Communication Error Bank 2 Sensor 1
P3023 Toyota — Battery Block 13 Becomes Weak

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 P3023 Code

1. What does the OBDII code P3023 mean?

The P3023 code indicates that Battery Block 13 in a hybrid vehicleâ€™s high-voltage battery pack is weaker than other blocks, typically due to reduced voltage performance.

2. What are the common symptoms of a P3023 code?

Symptoms include decreased fuel efficiency, reduced hybrid system performance, an illuminated check engine light, and possible warning messages related to the hybrid battery.

3. What causes the P3023 code to appear?

The most common cause is a degraded or faulty cell within Battery Block 13, but it can also result from corroded connections, wiring issues, or a malfunctioning battery management system.

4. Can I drive my vehicle with a P3023 code?

While the vehicle may still function, continued driving with this code can lead to further battery damage or reduced hybrid system performance. Immediate diagnosis and repair are recommended.

5. How is the P3023 code diagnosed?

A technician will use a scan tool to access battery block voltage data, inspect Battery Block 13 for irregularities, and check for damaged connections or wiring.

6. How do you fix a P3023 code?

Repairs may include replacing or reconditioning Battery Block 13, cleaning or repairing corroded connections, or recalibrating the battery management system.

7. Can the P3023 code be cleared without repairs?

Clearing the code without addressing the root cause is only a temporary solution, as the issue will likely return until the weak battery block is repaired or replaced.

8. What maintenance can help prevent a P3023 code?

Regularly inspecting the hybrid battery system, ensuring proper cooling of the battery pack, and keeping connections clean can help prevent weak battery blocks.

9. How much does it cost to fix a P3023 code?

The cost varies depending on whether the repair involves reconditioning the battery block, replacing it, or addressing other system issues. Repairs can range from $500 to $4,000 or more.

10. Can a weak Battery Block 13 damage other parts of the hybrid system?

Yes, a weak battery block can strain the battery management system and cause uneven loading on other blocks, potentially leading to further damage over time.