AutoCodes – Buick – P0B93 Buick

P0B93 Buick Code - Hybrid/Electric Vehicle Battery 18 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: P0B93 Buick indicates Hybrid/Electric Vehicle Battery 18 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 812

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B93 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 P0B93 Buick - Hybrid/Electric Vehicle Battery 18 Circuit High Voltage - AutoCodes.com — P0B93 Buick Code - Hybrid/Electric Vehicle Battery 18 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0B93 Buick?

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

How to Fix the DTC P0B93 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 P0B93 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 P0B93 Buick Code

1. What does the OBDII code P0B93 mean on a Buick?

The P0B93 code indicates a "Hybrid/Electric Vehicle Battery 18 Circuit High Voltage," meaning the vehicle's hybrid battery system has detected abnormally high voltage in circuit 18.

2. What are the common symptoms of code P0B93 in a Buick?

Symptoms may include the check engine light or hybrid warning light turning on, reduced fuel efficiency, limited electric motor performance, or the vehicle entering limp mode.

3. What causes the P0B93 code to appear?

Common causes include a faulty hybrid battery module, damaged or corroded wiring in circuit 18, a defective battery voltage sensor, or an issue with the battery control module.

4. Can I drive my Buick with the P0B93 code?

Driving with this code is not recommended as it may lead to further damage to the hybrid battery system or cause the vehicle to lose power unexpectedly.

5. How is the P0B93 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the wiring and connectors in circuit 18, check the hybrid battery voltage, and test the battery control module for faults.

6. What repairs are needed to fix the P0B93 code?

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

7. How much does it cost to fix the P0B93 code on a Buick?

Repair costs vary but can range from $200 for minor wiring repairs to several thousand dollars if the hybrid battery needs replacement.

8. Can a weak 12V battery trigger the P0B93 code?

While unlikely, a weak 12V battery can sometimes cause erratic behavior in the hybrid system and should be tested as part of the diagnostic process.

9. How can I prevent the P0B93 code from occurring?

Regular maintenance of the hybrid system, inspecting wiring for damage, and addressing warning lights promptly can help prevent this code from appearing.

10. Does the P0B93 code mean my hybrid battery is failing?

Not necessarily. While the code can indicate a failing hybrid battery, it may also result from wiring issues, sensor faults, or control module problems. Proper diagnosis is essential.