AutoCodes – Buick – P1B59 Buick

P1B59 Buick Code - Hybrid/Electric Vehicle Battery 39 Circuit High 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: P1B59 Buick indicates Hybrid/Electric Vehicle Battery 39 Circuit High 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 973

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 P1B59 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 P1B59 Buick - Hybrid/Electric Vehicle Battery 39 Circuit High Voltage - AutoCodes.com — P1B59 Buick Code - Hybrid/Electric Vehicle Battery 39 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B59 Buick?

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

How to Fix the DTC P1B59 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 P1B59 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 P1B59 Buick Code

1. What does the OBDII code P1B59 mean on a Buick?

The code P1B59 indicates a "Hybrid/Electric Vehicle Battery 39 Circuit High Voltage," meaning the vehicle's hybrid battery or associated circuitry is detecting abnormally high voltage in a specific circuit.

2. What are the common symptoms of code P1B59 on a Buick?

Symptoms may include reduced hybrid performance, warning lights on the dashboard (such as the check engine light or hybrid system warning), and possibly limited vehicle drivability.

3. What causes the P1B59 code to appear on a Buick?

Common causes include a fault in the hybrid battery module, damaged or corroded wiring in the battery circuit, a malfunctioning voltage sensor, or an error in the powertrain control module (PCM).

4. Can I drive my Buick with the P1B59 code?

Driving with this code is not recommended as it can lead to further damage to the hybrid system or leave the vehicle inoperable. Seek professional diagnosis and repair as soon as possible.

5. How is the P1B59 code diagnosed in a Buick?

A technician will use a diagnostic scanner to read the code, inspect the hybrid battery and related circuits, check for damaged wiring or connectors, and test the voltage sensors for accuracy.

6. What repairs are needed to fix the P1B59 code on a Buick?

Repairs may involve replacing a faulty hybrid battery module, repairing damaged wiring, replacing a defective voltage sensor, or reprogramming the powertrain control module.

7. How much does it cost to fix the P1B59 code on a Buick?

Repair costs can vary widely depending on the exact issue, but replacing a hybrid battery module can cost several thousand dollars, while smaller fixes like wiring repairs may cost a few hundred dollars.

8. Can a dead 12V battery trigger the P1B59 code on a Buick?

While the 12V battery is not directly related to the hybrid battery circuit, issues with the 12V system can lead to diagnostic errors or other electrical issues that might indirectly affect hybrid system operation.

9. Is the P1B59 code specific to Buick hybrid vehicles?

Yes, this code is specific to hybrid or electric Buick vehicles with a high-voltage battery system and pertains to a specific circuit within the hybrid battery.

10. How can I prevent the P1B59 code from reoccurring on a Buick?

Regular maintenance, inspecting hybrid system components for wear or damage, and promptly addressing warning lights or unusual vehicle behavior can help prevent this code from recurring.