AutoCodes – Buick – P0BA5 Buick

P0BA5 Buick Code - Hybrid/Electric Vehicle Battery 22 Circuit Performance

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: P0BA5 Buick indicates Hybrid/Electric Vehicle Battery 22 Circuit Performance.
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 870

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 P0BA5 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 P0BA5 Buick - Hybrid/Electric Vehicle Battery 22 Circuit Performance - AutoCodes.com — P0BA5 Buick Code - Hybrid/Electric Vehicle Battery 22 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0BA5 Buick?

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

How to Fix the DTC P0BA5 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 P0BA5 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 P0BA5 Buick Code

What does the OBDII code P0BA5 mean on a Buick?

The P0BA5 code indicates an issue with the performance of the Hybrid/Electric Vehicle Battery 22 Circuit, which typically relates to one of the battery cells or its associated circuitry.

What are the common symptoms of code P0BA5?

Symptoms may include a check engine light, reduced fuel efficiency, limited electric vehicle performance, or warning messages related to the hybrid system on the dashboard.

What causes the P0BA5 code to appear?

Common causes include a faulty battery cell, wiring issues in the Battery 22 Circuit, a malfunctioning battery management system, or corrosion on electrical connections.

Can I drive my Buick with the P0BA5 code active?

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

How is the P0BA5 code diagnosed?

A technician will use an OBDII scanner to confirm the code, inspect the battery pack and its circuitry, and test for voltage irregularities or damaged components in Battery 22 Circuit.

What repairs are needed to fix the P0BA5 code?

Repairs may include replacing the faulty battery module, repairing damaged wiring, cleaning corroded connections, or updating the battery management system software.

How much does it cost to fix the P0BA5 code on a Buick?

Repair costs vary but can range from $200 for minor wiring repairs to over $1,000 if a battery module or multiple components need replacement.

Can a weak 12-volt battery cause the P0BA5 code?

While unlikely, a weak 12-volt battery can sometimes trigger hybrid system errors, so it should be tested as part of the diagnostic process.

Is the P0BA5 code covered under warranty?

Hybrid system components like the battery pack may be covered under the vehicle's hybrid-specific warranty, depending on the age and mileage of the vehicle.

How can I prevent the P0BA5 code from recurring?

Regular maintenance, avoiding extreme temperature exposure, and promptly addressing any hybrid system warnings can help prevent this code from reappearing.