AutoCodes – Buick – P1B49 Buick

P1B49 Buick Code - Hybrid/Electric Vehicle Battery 34 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: P1B49 Buick indicates Hybrid/Electric Vehicle Battery 34 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.

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Code Popularity 780

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B49 Buick 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 P1B49 Buick - Hybrid/Electric Vehicle Battery 34 Circuit Low Voltage - AutoCodes.com — P1B49 Buick Code - Hybrid/Electric Vehicle Battery 34 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B49 Buick?

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

How to Fix the DTC P1B49 Buick?

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 P1B49 Buick 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 P1B49 Buick Code

1. What does the OBDII code P1B49 mean on a Buick?

The P1B49 code indicates a "Hybrid/Electric Vehicle Battery 34 Circuit Low Voltage," meaning thereâ€™s an issue with the voltage level in one of the hybrid battery circuits.

2. What are the symptoms of the P1B49 code on a Buick?

Common symptoms include a check engine light, reduced fuel efficiency, limited hybrid/electric performance, or the vehicle entering limp mode.

3. What causes the P1B49 code on a Buick?

This code can be triggered by a faulty battery cell, loose or corroded connections, damaged wiring, or a problem with the battery management system.

4. Can I drive my Buick with the P1B49 code?

Itâ€™s not recommended to drive with this code for extended periods, as it may lead to reduced performance or further damage to the hybrid/electric system.

5. How is the P1B49 code diagnosed?

A technician will use a scan tool to read the code, inspect the battery pack, check for wiring issues, and test the voltage levels of the affected circuit.

6. How do you fix the P1B49 code on a Buick?

Repairs may include replacing faulty battery cells, repairing damaged wiring, cleaning corroded connectors, or reprogramming the battery management system.

7. Does the P1B49 code mean the hybrid battery needs to be replaced?

Not necessarily. The issue could be with the circuit, wiring, or connectors rather than the entire battery pack, so further diagnosis is needed.

8. How much does it cost to fix the P1B49 code on a Buick?

Repair costs can vary widely, ranging from $100 for minor wiring repairs to over $1,000 if a battery module replacement is required.

9. Can a low-voltage hybrid battery circuit damage the vehicle?

If left unresolved, a low-voltage circuit can impair the hybrid system, reduce performance, and potentially cause long-term damage to other components.

10. Is the P1B49 code common in Buick hybrid vehicles?

While not extremely common, this code can occur in aging hybrid systems or vehicles with poor battery maintenance. Regular inspections can help prevent it.