AutoCodes – Generic – P1B49

P1B49 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 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 834

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 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 - Hybrid/Electric Vehicle Battery 34 Circuit Low Voltage - AutoCodes.com — P1B49 Code - Hybrid/Electric Vehicle Battery 34 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B49?

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

How to Fix the DTC P1B49?

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 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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Need Help with the Code?

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Information for Specific Makes

P1B49 Buick — Hybrid/Electric Vehicle Battery 34 Circuit Low Voltage
P1B49 Cadillac — Hybrid/Electric Vehicle Battery 34 Circuit Low Voltage
P1B49 Chevrolet — Hybrid/Electric Vehicle Battery 34 Circuit Low Voltage
P1B49 GMC — Hybrid/Electric Vehicle Battery 34 Circuit Low Voltage
P1B49 Saturn — Hybrid/Electric Vehicle Battery 34 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 P1B49 Code

1. What are the common symptoms of OBDII code P1B49 (Hybrid/Electric Vehicle Battery 34 Circuit Low Voltage)?

The common symptoms include poor fuel efficiency, decreased electric driving range, and potential issues with hybrid system performance.

2. What are the possible causes of OBDII code P1B49?

Possible causes of this code include a faulty battery pack, issues with the battery management system, damaged wiring or connectors, or a malfunctioning hybrid control module.

3. How can I diagnose the root cause of OBDII code P1B49?

Diagnosing the issue may require using a diagnostic scanner to retrieve the specific fault codes, performing voltage tests on the battery pack and related components, and inspecting the wiring and connectors for any signs of damage.

4. Can I continue driving my vehicle with OBDII code P1B49 present?

It is not recommended to continue driving the vehicle with this code active, as it can lead to further damage to the hybrid system and potentially leave you stranded if the battery voltage drops too low.

5. What are some repair tips for addressing OBDII code P1B49?

Repair tips may include checking and cleaning battery terminals, replacing damaged wiring or connectors, recalibrating the battery management system, or replacing the faulty battery pack if necessary.

6. Is it safe to attempt DIY repairs for OBDII code P1B49?

While some basic checks and maintenance tasks can be performed by DIY enthusiasts, diagnosing and repairing complex hybrid system issues should be left to experienced professionals due to the high voltage involved.

7. How much does it typically cost to repair OBDII code P1B49?

The cost of repair can vary significantly depending on the root cause of the issue, the extent of the damage, and whether any parts need to be replaced. It is advisable to obtain quotes from reputable automotive shops for an accurate estimate.

8. Can a low or dead 12-volt auxiliary battery cause OBDII code P1B49?

Yes, a low or dead 12-volt auxiliary battery can potentially trigger this code as it may affect the overall voltage levels in the hybrid/electric system.

9. Are there any preventative maintenance measures to avoid OBDII code P1B49?

Regularly inspecting and maintaining the hybrid/electric vehicle battery system, ensuring proper charging habits, and following the manufacturer's recommended service intervals can help prevent issues leading to this code.

10. Will resetting the OBDII code P1B49 clear the issue permanently?

Resetting the code may temporarily clear the issue, but if the root cause of the problem is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the underlying issue to resolve OBDII code P1B49 permanently.