AutoCodes – Chevrolet – P1B4B Chevrolet

P1B4B Chevrolet 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 Chevrolet 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.

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Code Popularity 942

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B4B Chevrolet 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 Chevrolet - Hybrid/Electric Vehicle Battery 35 Circuit Performance - AutoCodes.com — P1B4B Chevrolet Code - Hybrid/Electric Vehicle Battery 35 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B4B Chevrolet?

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

How to Fix the DTC P1B4B Chevrolet?

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 Chevrolet 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 P1B4B Chevrolet Code

1. What does the OBDII code P1B4B mean on a Chevrolet?

P1B4B indicates a performance issue with the Hybrid/Electric Vehicle Battery 35 Circuit, often related to the voltage or communication of a specific battery module.

2. What are the common symptoms of the P1B4B code?

Symptoms may include reduced hybrid or EV performance, an illuminated check engine light, limited acceleration, or decreased fuel efficiency.

3. What causes the P1B4B code to appear?

The code can be triggered by a faulty battery cell or module, poor electrical connections, damaged wiring, or a malfunctioning battery management system.

4. How can I diagnose the P1B4B code?

Diagnosis typically involves scanning the vehicle with an advanced OBDII tool, inspecting the battery pack for faults, and checking the wiring and connections for damage or corrosion.

5. Can I drive my Chevrolet with the P1B4B code active?

Driving with this code is possible but not recommended, as it can lead to reduced performance and may cause further damage to the hybrid or EV battery system.

6. How do I fix the P1B4B code?

Repairs may include replacing a defective battery module, repairing damaged wiring, cleaning corroded connections, or updating the battery control module software.

7. Is the P1B4B code specific to Chevrolet vehicles?

While the code is specific to Chevrolet hybrid and electric vehicles, it may also apply to other GM vehicles with similar hybrid or EV systems.

8. How much does it cost to repair the P1B4B code?

Repair costs can vary widely depending on the issue but may range from $200 for wiring repairs to over $1,000 for battery module replacement.

9. Can a weak 12-volt battery cause the P1B4B code?

A weak or failing 12-volt battery is unlikely to cause this specific code, but it can affect the overall performance of the hybrid system and should be checked.

10. Does the P1B4B code require reprogramming the battery management system?

In some cases, reprogramming or updating the battery management system software may be necessary to resolve the issue after repairs are completed.