AutoCodes – Chevrolet – P1BA8 Chevrolet

P1BA8 Chevrolet Code - Hybrid/Electric Vehicle Battery 66 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: P1BA8 Chevrolet indicates Hybrid/Electric Vehicle Battery 66 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 1,259

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 P1BA8 Chevrolet 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 P1BA8 Chevrolet - Hybrid/Electric Vehicle Battery 66 Circuit Performance - AutoCodes.com — P1BA8 Chevrolet Code - Hybrid/Electric Vehicle Battery 66 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1BA8 Chevrolet?

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

How to Fix the DTC P1BA8 Chevrolet?

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 P1BA8 Chevrolet 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 P1BA8 Chevrolet Code

1. What does OBDII code P1BA8 mean on a Chevrolet?

Code P1BA8 indicates a problem with the Hybrid/Electric Vehicle Battery 66 Circuit Performance, often related to the battery management system.

2. What are the common symptoms of code P1BA8 on a Chevrolet?

Symptoms include a check engine light, reduced hybrid or EV performance, warning messages on the dashboard, and possibly decreased fuel efficiency.

3. What causes code P1BA8 on a Chevrolet vehicle?

Common causes include battery cell imbalance, faulty battery sensor wiring, a defective battery control module, or issues in the battery pack itself.

4. Can I drive my Chevrolet with a P1BA8 code?

While the vehicle may still be drivable, continuing to drive with this code can lead to further damage or reduced hybrid/EV functionality. Itâ€™s best to address the issue promptly.

5. How is code P1BA8 diagnosed on a Chevrolet?

A technician will use a scan tool to read the code, inspect battery sensor wiring and connectors, and perform tests on the battery control module and individual battery cells.

6. What repairs fix code P1BA8 on a Chevrolet?

Repairs may include replacing faulty battery sensors, repairing damaged wiring, reprogramming or replacing the battery control module, or balancing/replacing battery cells.

7. Is the P1BA8 code specific to Chevrolet hybrid or electric vehicles?

Yes, this code typically appears on Chevrolet hybrid or EV models, as it relates to the high-voltage battery system.

8. How much does it cost to fix a P1BA8 code on a Chevrolet?

Repair costs vary depending on the cause; minor wiring repairs may cost less than $200, while battery module replacement or repairs could exceed $1,000.

9. Can a dead 12-volt battery cause the P1BA8 code on a Chevrolet?

A weak or dead 12-volt battery may indirectly contribute to this code, as it powers the battery management system. Itâ€™s worth checking the 12-volt battery first.

10. Do I need to take my Chevrolet to a dealer for a P1BA8 code?

While independent repair shops may handle this code, a dealership or hybrid/EV specialist is often better equipped to diagnose and repair high-voltage battery issues.