AutoCodes – Generic – P1B23

P1B23 Code - Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage

Quick Answer

The Hybrid/Electric Vehicle battery pack contains 288 cells. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module. 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: P1B23 indicates Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage.
Common causes: Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,190

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 Mar 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1B23 Description

The Hybrid/Electric Vehicle battery pack contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in-series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cells are also grouped together into three sections. The first 90 cells/30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through to 96. Battery section two is located behind section one. It is made up of 72 cells/24 cell groups and contains batteries 43 through to 66. The transverse battery section is section number three, it is made up of the remaining 126 cells/42 cell groups and contains batteries 1 through to 42. The three battery sections are individually serviceable components.
The battery energy control module monitors the voltage of the 96 battery cell groups through the four hybrid/EV battery interface control modules. Voltage sense circuits are attached to each individual cell group, and these sense circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring harness, and battery energy control module are all considered serviceable components.
The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P1B23 - Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage - AutoCodes.com — P1B23 Code - Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B23?

Faulty Hybrid/Electric Vehicle Battery Pack
Faulty Hybrid/Electric Vehicle Battery Interface Control Module

How to Fix the DTC P1B23?

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 P1B23 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 P1B23 code?

Need more information on how to fix the P1B23 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B23 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B23 Buick — Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage
P1B23 Cadillac — Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage
P1B23 Chevrolet — Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage
P1B23 GMC — Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage
P1B23 Saturn — Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage

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 P1B23 Code

1. What are common symptoms of OBDII code P1B23 (Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage)?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential inability to start the vehicle.

2. What are the possible causes of OBDII code P1B23?

- Causes may include a faulty hybrid/electric vehicle battery, issues with the battery management system, damaged wiring, or a malfunctioning battery control module.

3. How can I diagnose the OBDII code P1B23?

- Diagnostic steps may involve using a scan tool to retrieve the code, checking the hybrid/electric vehicle battery for voltage levels, inspecting wiring for damage, and testing the battery control module.

4. Can driving with OBDII code P1B23 cause further damage to the vehicle?

- Continuing to drive with this code may lead to further strain on the hybrid system components and potentially cause damage to the battery or related systems.

5. How can I repair OBDII code P1B23 (Hybrid/Electric Vehicle Battery 31 Circuit Low Voltage)?

- Repair options may include replacing the hybrid/electric vehicle battery, repairing damaged wiring, resetting the battery control module, or addressing any issues with the battery management system.

6. Is it safe to drive my vehicle with OBDII code P1B23?

- It is not recommended to drive the vehicle with this code present, as it may lead to further complications and potential safety hazards.

7. Can a DIY enthusiast fix OBDII code P1B23 at home?

- While some basic diagnostic steps can be performed at home, repairing OBDII code P1B23 often requires specialized tools and knowledge, so it is advisable to seek professional help.

8. How often does OBDII code P1B23 occur in hybrid/electric vehicles?

- OBDII code P1B23 can occur in hybrid/electric vehicles when there are issues with the battery circuit, though the frequency can vary depending on the vehicle's age and maintenance.

9. Will resetting the OBDII code P1B23 make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing P1B23 is not addressed, the code is likely to reappear.

10. How much does it cost to repair OBDII code P1B23?

- The cost of repairing OBDII code P1B23 can vary depending on the extent of the issue, the parts needed, and whether professional labor is required, so it is recommended to get a diagnostic assessment first.