AutoCodes – GMC – P1B49 GMC

P1B49 GMC 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 GMC 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 1,090

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

What does this mean?

What are the Possible Causes of the DTC P1B49 GMC?

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

How to Fix the DTC P1B49 GMC?

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 GMC 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 GMC Code

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

- Common symptoms include poor vehicle performance, reduced fuel efficiency, and potential issues with the hybrid/electric system.

2. What are the typical causes of OBDII code P1B49 GMC?

- The code P1B49 GMC is often triggered by low voltage in the hybrid/electric vehicle battery 34 circuit, which can be caused by a faulty battery cell, wiring issues, or a problem with the battery management system.

3. How can I diagnose the OBDII code P1B49 GMC at home?

- You can diagnose the code by checking the hybrid/electric system's battery voltage using a multimeter, inspecting the battery connections for any corrosion or damage, and scanning for any additional fault codes related to the hybrid/electric system.

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

- Repair tips include checking and replacing any faulty battery cells, repairing damaged wiring in the battery 34 circuit, and resetting the fault codes after performing repairs.

5. Can driving with the OBDII code P1B49 GMC present any risks?

- Driving with this code may lead to further damage to the hybrid/electric system components and potentially reduce the vehicle's overall performance and fuel efficiency.

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

- The cost of repairing this code can vary depending on the extent of the issue, but it may involve replacing a faulty battery cell, repairing wiring, or addressing issues with the battery management system, which can range from a few hundred to over a thousand dollars.

7. Is it safe to continue driving my vehicle with the OBDII code P1B49 GMC present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric system and potentially cause safety hazards.

8. How urgent is it to address the OBDII code P1B49 GMC?

- It is advisable to address this code as soon as possible to prevent further damage to the hybrid/electric system and ensure the vehicle's optimal performance and efficiency.

9. Can a DIY enthusiast repair OBDII code P1B49 GMC, or is professional help required?

- While some basic diagnostics and repairs can be done by a DIY enthusiast, addressing complex issues related to the hybrid/electric system may require professional help from a qualified technician with expertise in hybrid/electric vehicles.

10. Are there any preventive maintenance steps to avoid encountering OBDII code P1B49 GMC?

- Regularly inspecting and maintaining the hybrid/electric vehicle battery, ensuring proper charging habits, and promptly addressing any warning signs related to the hybrid/electric system can help prevent the occurrence of code P1B49 GMC.