AutoCodes – Generic – P1B79

P1B79 Code - Hybrid/Electric Vehicle Battery 50 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: P1B79 indicates Hybrid/Electric Vehicle Battery 50 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 1,744

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 P1B79 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 P1B79 - Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage - AutoCodes.com — P1B79 Code - Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B79?

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

How to Fix the DTC P1B79?

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 P1B79 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

P1B79 Buick — Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage
P1B79 Cadillac — Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage
P1B79 Chevrolet — Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage
P1B79 GMC — Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage
P1B79 Saturn — Hybrid/Electric Vehicle Battery 50 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 P1B79 Code

1. What are common symptoms of OBDII code P1B79 (Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage)?

- Common symptoms include reduced power, poor fuel efficiency, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code P1B79?

- The code P1B79 can be triggered by a faulty hybrid/electric vehicle battery, issues with the battery management system, or a problem with the battery control module.

3. How can I diagnose the OBDII code P1B79?

- Diagnosing the code P1B79 typically involves using a scan tool to access the vehicle's onboard diagnostic system and check for any related fault codes.

4. What are some repair tips for addressing OBDII code P1B79?

- Repair tips may include inspecting the hybrid/electric vehicle battery for damage, checking the battery connections, and ensuring proper functioning of the battery control module.

5. Can I still drive my vehicle with OBDII code P1B79 present?

- It is not recommended to drive the vehicle with OBDII code P1B79 present, as it can lead to further damage to the hybrid/electric vehicle system.

6. How serious is OBDII code P1B79 (Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage)?

- OBDII code P1B79 should be taken seriously as it indicates a potential issue with the hybrid/electric vehicle battery, which can affect the vehicle's performance and reliability.

7. What should I do if I encounter OBDII code P1B79 while driving?

- If you encounter OBDII code P1B79 while driving, it is recommended to pull over safely, turn off the vehicle, and have the issue diagnosed and repaired by a qualified technician.

8. Can I reset OBDII code P1B79 on my own?

- While you may be able to clear the code temporarily using a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. How much does it typically cost to repair OBDII code P1B79?

- The cost of repair for OBDII code P1B79 can vary depending on the extent of the issue and the specific components that need to be repaired or replaced.

10. Is OBDII code P1B79 covered by warranty for hybrid/electric vehicles?

- In many cases, OBDII code P1B79 may be covered under the warranty for hybrid/electric vehicle components. It is recommended to check with the vehicle manufacturer or dealership for more information.