AutoCodes – Chevrolet – P1B79 Chevrolet

P1B79 Chevrolet 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 Chevrolet 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 817

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

What does this mean?

What are the Possible Causes of the DTC P1B79 Chevrolet?

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

How to Fix the DTC P1B79 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 P1B79 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 P1B79 Chevrolet Code

What does the OBDII code P1B79 mean on a Chevrolet?

The P1B79 code indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 50 circuit, which is part of the high-voltage battery system.

What are the common symptoms of the P1B79 code?

Symptoms may include an illuminated check engine light, reduced vehicle performance, limited EV mode functionality, and potential battery-related warnings on the dashboard.

What causes the P1B79 code to appear?

This code can be caused by a weak or failing hybrid battery module, a damaged wiring harness, corroded electrical connections, or a malfunctioning battery management system.

Can the P1B79 code damage my vehicle if ignored?

Ignoring the P1B79 code can lead to further degradation of the hybrid battery system, reduced fuel efficiency, and potential safety risks due to compromised electrical performance.

How is the P1B79 code diagnosed?

A technician will use a scan tool to read the code, inspect the hybrid battery circuit for voltage abnormalities, check for damaged wiring or connectors, and test the battery modules.

Can I drive with the P1B79 code active?

It is not recommended to drive with this code active, as it can lead to reduced performance and potential failure of the hybrid system, especially under high load conditions.

How can the P1B79 code be fixed?

Repairs may involve replacing a faulty hybrid battery module, repairing damaged wiring or connectors, or reprogramming the battery management system if needed.

How much does it cost to fix the P1B79 code?

The repair cost can vary widely, ranging from $100 for wiring repairs to over $1,000 if the hybrid battery module needs replacement.

Can a low 12V battery cause the P1B79 code?

While a low 12V battery might cause other electrical issues, this code specifically relates to the high-voltage hybrid battery circuit and is unlikely to be caused by the 12V battery.

Does the P1B79 code always mean the hybrid battery needs replacement?

No, the code could also be triggered by wiring issues, poor connections, or a failing battery control module, so a thorough diagnosis is necessary before replacing the battery.