AutoCodes – Buick – P0B59 Buick

P0B59 Buick Code - Hybrid/Electric Vehicle Battery 7 Circuit

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: P0B59 Buick indicates Hybrid/Electric Vehicle Battery 7 Circuit.
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 994

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B59 Buick 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 P0B59 Buick - Hybrid/Electric Vehicle Battery 7 Circuit - AutoCodes.com — P0B59 Buick Code - Hybrid/Electric Vehicle Battery 7 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B59 Buick?

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

How to Fix the DTC P0B59 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 P0B59 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.

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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 P0B59 Buick Code

1. What does the OBDII code P0B59 mean on a Buick?

P0B59 refers to a problem with the Hybrid/Electric Vehicle Battery 7 Circuit, indicating an issue with the voltage, wiring, or communication related to battery block 7.

2. What are the common symptoms of code P0B59 in a Buick?

Symptoms may include a check engine light, reduced fuel efficiency, limited hybrid system performance, or the vehicle entering limp mode.

3. What causes the P0B59 code to appear in a Buick?

Common causes include a faulty battery module, damaged wiring or connections, a defective battery control module, or internal battery cell imbalances.

4. Can I drive my Buick with a P0B59 code?

Driving with this code is not recommended as it can lead to reduced performance or damage to the hybrid battery system.

5. How is the P0B59 code diagnosed?

A technician will use a scan tool to check for related codes, inspect battery voltage readings, examine wiring and connectors, and test the battery control module.

6. What repairs are needed to fix code P0B59 on a Buick?

Repairs may include replacing the faulty battery module, repairing damaged wiring, cleaning or securing electrical connections, or reprogramming the battery control module.

7. How much does it cost to fix the P0B59 code in a Buick?

Repair costs vary depending on the issue, but replacing a battery module can range from $1,000 to $6,000, while wiring repairs or reprogramming are generally less expensive.

8. Can a low-voltage accessory battery cause the P0B59 code?

No, the P0B59 code specifically relates to the high-voltage hybrid battery system and not the 12V accessory battery.

9. Will clearing the code fix the P0B59 issue in my Buick?

Clearing the code without addressing the underlying problem will not fix the issue, and the code is likely to return.

10. How can I prevent the P0B59 code from occurring?

Regular maintenance, inspecting the hybrid battery system for damage, and promptly addressing any warning lights or irregularities can help prevent the code from occurring.