P0B79 Buick Code - Hybrid/Electric Vehicle Battery 13 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
- P0B79 Buick indicates Hybrid/Electric Vehicle Battery 13 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.
Code P0B79 Buick Description
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.
What are the Possible Causes of the DTC P0B79 Buick?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P0B79 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 P0B79 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.
Need more information about the P0B79 Buick code?
Need more information on how to fix the P0B79 Buick code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0B79 Buick code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0B79 Buick Code
1. What does the OBDII code P0B79 mean for a Buick?
The P0B79 code indicates a "Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage," meaning the voltage in battery circuit 13 is below the expected range.
2. What are the common symptoms of a P0B79 code in a Buick?
Symptoms may include the check engine light turning on, reduced fuel efficiency, limited electric drive performance, or the vehicle entering a limp mode.
3. What causes the P0B79 code to appear on a Buick?
Common causes include a faulty battery cell, damaged wiring or connectors in the battery circuit, a malfunctioning battery management system (BMS), or corroded electrical connections.
4. Can I drive my Buick with a P0B79 code?
It’s not recommended to drive your vehicle with this code, as it may cause further damage to the hybrid/electric system and impact vehicle performance or safety.
5. How do you diagnose a P0B79 code in a Buick?
Diagnosis typically involves using a scan tool to check for additional codes, inspecting the battery and associated wiring for damage or corrosion, and testing the voltage in battery circuit 13.
6. How can I fix the P0B79 code on my Buick?
Repairs may include replacing a faulty battery cell, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming/repairing the battery management system.
7. How much does it cost to fix a P0B79 code on a Buick?
Repair costs vary widely depending on the issue, ranging from $100–$300 for wiring repairs to over $1,000 if a battery pack or BMS needs replacement.
8. Can a weak 12V battery trigger a P0B79 code in a Buick?
While unlikely, a weak 12V battery can sometimes indirectly affect the hybrid system and trigger related codes. It’s best to check both the 12V and high-voltage systems during diagnosis.
9. Does the P0B79 code mean my hybrid battery is failing?
Not necessarily. While it could indicate a failing battery module, it could also result from wiring issues or a malfunction in the battery management system.
10. Do I need a professional to repair a P0B79 code in my Buick?
Due to the high voltage and complexity of hybrid/electric systems, it’s advisable to have a certified technician handle repairs for this code.
Discuss the causes and fixes for P0B79 Buick OBDII Code
Code P0B79 Buick comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
