AutoCodes – GMC – P1BA8 GMC

P1BA8 GMC 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 GMC 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 809

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P1BA8 GMC?

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

How to Fix the DTC P1BA8 GMC?

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 GMC 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.

Need more information about the P1BA8 GMC code?

Need more information on how to fix the P1BA8 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1BA8 GMC code diagnosed by a professional: Find a repair shop in your area

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 GMC Code

What does OBDII code P1BA8 mean for a GMC vehicle?

The P1BA8 code indicates an issue with the Hybrid/Electric Vehicle Battery 66 Circuit Performance, typically related to the high-voltage battery or its associated circuitry.

What are common symptoms of code P1BA8 in a GMC?

Symptoms may include an illuminated check engine light, reduced hybrid or EV performance, limited driving range, or a warning message on the dashboard.

What causes the P1BA8 code to appear?

Common causes include a faulty battery module, poor electrical connections, damaged wiring in the high-voltage battery circuit, or a malfunctioning battery control module.

Can a loose connection cause the P1BA8 code?

Yes, loose or corroded electrical connections in the high-voltage battery circuit can trigger this code.

How is the P1BA8 code diagnosed?

Technicians use a scan tool to read the code, inspect the high-voltage battery and its connections, test the battery control module, and check for damaged or shorted wiring.

Can you drive with code P1BA8 active?

Driving with this code is not recommended, as it may lead to reduced performance, safety risks, or further damage to the hybrid or electric system.

How is the P1BA8 code typically fixed?

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

Is the P1BA8 code covered under the GMC warranty?

It may be covered under the hybrid or EV system warranty, but coverage depends on your vehicle's age, mileage, and warranty terms.

What tools are needed to fix the P1BA8 code?

A scan tool capable of reading hybrid/EV-specific codes, a multimeter for testing circuits, and specialized tools for handling high-voltage components are typically required.

How much does it cost to repair the P1BA8 code on a GMC?

Repair costs vary widely depending on the root cause, ranging from $100 for minor repairs to over $1,000 for high-voltage battery replacements.