AutoCodes – Buick – P0B65 Buick

P0B65 Buick Code - Hybrid/Electric Vehicle Battery 9 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: P0B65 Buick indicates Hybrid/Electric Vehicle Battery 9 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 900

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 P0B65 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 P0B65 Buick - Hybrid/Electric Vehicle Battery 9 Circuit Low Voltage - AutoCodes.com — P0B65 Buick Code - Hybrid/Electric Vehicle Battery 9 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B65 Buick?

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

How to Fix the DTC P0B65 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 P0B65 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 P0B65 Buick Code

1. What does the OBDII code P0B65 mean for a Buick?

The P0B65 code indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 9 circuit, which is part of the high-voltage battery system.

2. What are common symptoms of the P0B65 code in a Buick?

Symptoms may include a check engine light, reduced fuel efficiency, limited hybrid system performance, or the vehicle failing to operate in electric mode.

3. What causes the P0B65 code to appear?

Common causes include a faulty battery cell or module, damaged wiring in the Battery 9 circuit, a malfunctioning battery control module, or poor electrical connections.

4. Can I drive my Buick with the P0B65 code?

Driving with the P0B65 code is not recommended, as it can lead to further damage to the hybrid battery system and reduced vehicle performance.

5. How is the P0B65 code diagnosed?

A technician will use a scan tool to read the code and check related data, inspect the battery and wiring, and perform voltage and continuity tests on the Battery 9 circuit.

6. How is the P0B65 code repaired?

Repairs may involve replacing a faulty battery module, repairing damaged wiring, cleaning or reconnecting electrical connections, or reprogramming the battery control module.

7. How much does it cost to fix the P0B65 code on a Buick?

Repair costs vary depending on the issue, ranging from $100 for wiring repairs to over $1,000 for battery module replacement or control module reprogramming.

8. Can the P0B65 code be caused by a software issue?

Yes, sometimes outdated or corrupted software in the battery control module can trigger this code, requiring a software update or reprogramming.

9. How can I prevent the P0B65 code from recurring?

Regular maintenance, avoiding excessive heat exposure to the hybrid battery, and promptly addressing warning lights can help prevent this code from recurring.

10. Does the P0B65 code always mean the battery is failing?

No, the issue could be related to wiring, connections, or the control module rather than the battery itself. A proper diagnosis is essential.