AutoCodes – Generic – P1B4B

P1B4B Code - Hybrid/Electric Vehicle Battery 35 Circuit Performance

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: P1B4B indicates Hybrid/Electric Vehicle Battery 35 Circuit Performance.
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 1,111

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 P1B4B 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 P1B4B - Hybrid/Electric Vehicle Battery 35 Circuit Performance - AutoCodes.com — P1B4B Code - Hybrid/Electric Vehicle Battery 35 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B4B?

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

How to Fix the DTC P1B4B?

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 P1B4B 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 P1B4B code?

Need more information on how to fix the P1B4B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B4B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B4B Buick — Hybrid/Electric Vehicle Battery 35 Circuit Performance
P1B4B Cadillac — Hybrid/Electric Vehicle Battery 35 Circuit Performance
P1B4B Chevrolet — Hybrid/Electric Vehicle Battery 35 Circuit Performance
P1B4B GMC — Hybrid/Electric Vehicle Battery 35 Circuit Performance
P1B4B Saturn — Hybrid/Electric Vehicle Battery 35 Circuit Performance

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 P1B4B Code

1. What are the common symptoms of OBDII code P1B4B (Hybrid/Electric Vehicle Battery 35 Circuit Performance)?

- Common symptoms include reduced hybrid/electric vehicle performance, decreased fuel efficiency, and potential drivability issues.

2. What are some possible causes of OBDII code P1B4B?

- Possible causes can include a faulty hybrid/electric vehicle battery, damaged wiring or connectors in circuit 35, or issues with the battery management system.

3. How can I diagnose the source of OBDII code P1B4B?

- Diagnosing the issue may require using a scan tool to read the code, inspecting the hybrid/electric vehicle battery and related components, and testing the circuit 35 for continuity and proper voltage.

4. What should I do if I encounter code P1B4B on my hybrid/electric vehicle?

- It is recommended to have the vehicle inspected by a qualified technician to determine the exact cause of the code and perform any necessary repairs or replacements.

5. Can I continue driving my hybrid/electric vehicle with OBDII code P1B4B?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage and potentially unsafe driving conditions.

6. Are there any repair tips for fixing OBDII code P1B4B?

- Repair tips may include checking and cleaning the battery connections, inspecting the wiring for damage, and resetting the fault code to see if it reoccurs.

7. How much does it typically cost to repair OBDII code P1B4B?

- The cost of repairs can vary depending on the exact cause of the code, but it may involve replacing the hybrid/electric vehicle battery, repairing wiring issues, or recalibrating the battery management system.

8. Can OBDII code P1B4B be triggered by a simple battery issue?

- Yes, a simple battery issue such as low voltage or a weak cell can trigger this code, so it's important to have the battery thoroughly tested as part of the diagnosis.

9. Is OBDII code P1B4B specific to certain hybrid or electric vehicle models?

- This code is specific to hybrid and electric vehicles that use OBDII systems, so it may vary in its application across different makes and models.

10. How can I prevent OBDII code P1B4B from reoccurring in the future?

- Regular maintenance of the hybrid/electric vehicle battery, monitoring the battery's performance, and addressing any warning signs promptly can help prevent the recurrence of this code.