AutoCodes – Chevrolet – P1B99 Chevrolet

P1B99 Chevrolet Code - Hybrid/Electric Vehicle Battery 61 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: P1B99 Chevrolet indicates Hybrid/Electric Vehicle Battery 61 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 840

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 P1B99 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 P1B99 Chevrolet - Hybrid/Electric Vehicle Battery 61 Circuit Performance - AutoCodes.com — P1B99 Chevrolet Code - Hybrid/Electric Vehicle Battery 61 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B99 Chevrolet?

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

How to Fix the DTC P1B99 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 P1B99 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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Need Help with the Code?

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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 P1B99 Chevrolet Code

What does the OBDII code P1B99 mean on a Chevrolet?

The P1B99 code indicates an issue with the Hybrid/Electric Vehicle Battery 61 Circuit Performance, typically involving a fault in the battery module or its related circuitry.

What are the common symptoms of the P1B99 code?

Symptoms may include a check engine light, reduced vehicle performance, warning messages about the hybrid or electric system, and potential charging issues.

What causes the P1B99 code on a Chevrolet?

Common causes include a faulty battery module, damaged wiring or connectors in the battery circuit, or issues with the battery control module.

Can I continue driving with a P1B99 code?

It is not recommended to drive for long periods with this code, as it can lead to reduced performance or potential damage to the hybrid/electric system.

How is the P1B99 code diagnosed?

A technician will typically use a scan tool to confirm the code, inspect the battery circuit for damage, and test the battery module and related components for proper performance.

What repairs can fix the P1B99 code?

Repairs may involve replacing the faulty battery module, repairing damaged wiring or connectors, or reprogramming or replacing the battery control module.

How much does it cost to fix the P1B99 code?

Repair costs vary depending on the exact issue but can range from $200 for minor wiring repairs to over $1,000 for battery module replacement.

Can a dead 12-volt battery trigger a P1B99 code?

While unlikely, a weak or dead 12-volt battery could cause related errors and should be tested as part of the diagnostic process.

Is the P1B99 code covered under warranty?

Battery-related issues in hybrid or electric vehicles may be covered under manufacturer warranties, depending on the vehicle's age and mileage.

What tools are needed to troubleshoot the P1B99 code?

A professional scan tool, a multimeter for testing circuits, and access to the vehicleâ€™s service manual are typically required for proper diagnostics.