AutoCodes – Generic – P1B99

P1B99 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 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 1,536

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

What does this mean?

What are the Possible Causes of the DTC P1B99?

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

How to Fix the DTC P1B99?

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 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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Information for Specific Makes

P1B99 Buick — Hybrid/Electric Vehicle Battery 61 Circuit Performance
P1B99 Cadillac — Hybrid/Electric Vehicle Battery 61 Circuit Performance
P1B99 Chevrolet — Hybrid/Electric Vehicle Battery 61 Circuit Performance
P1B99 GMC — Hybrid/Electric Vehicle Battery 61 Circuit Performance
P1B99 Saturn — Hybrid/Electric Vehicle Battery 61 Circuit Performance

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 Code

1. What are the common symptoms of OBDII code P1B99 related to Hybrid/Electric Vehicle Battery 61 Circuit Performance?

- Common symptoms include reduced electric vehicle range, difficulty starting the vehicle, and warning lights on the dashboard.

2. What are the possible causes of OBDII code P1B99 indicating Hybrid/Electric Vehicle Battery 61 Circuit Performance issues?

- Causes can include a faulty battery pack, damaged wiring or connectors, issues with the battery management system, or a malfunctioning hybrid control module.

3. How can I diagnose OBDII code P1B99 related to Hybrid/Electric Vehicle Battery 61 Circuit Performance?

- Diagnosis typically involves using a scan tool to read the code, checking the battery pack voltage levels, inspecting wiring and connectors for damage, and testing the hybrid control module.

4. What are the repair options for resolving OBDII code P1B99 issues with Hybrid/Electric Vehicle Battery 61 Circuit Performance?

- Repairs may involve replacing a faulty battery pack, repairing damaged wiring or connectors, reprogramming the hybrid control module, or recalibrating the battery management system.

5. Can OBDII code P1B99 be cleared/reset, or does it require immediate attention?

- The code can be cleared, but it is recommended to address the underlying issue promptly to prevent further damage to the hybrid/electric vehicle's battery system.

6. Are there any safety precautions to consider when working on Hybrid/Electric Vehicle Battery 61 Circuit Performance issues?

- It is important to follow manufacturer guidelines, ensure proper insulation when handling high-voltage components, and disconnect the vehicle's power source before performing any repairs.

7. How often should I perform maintenance checks on the hybrid/electric vehicle battery system to prevent OBDII code P1B99 from occurring?

- Regular maintenance checks, as recommended by the vehicle manufacturer, can help prevent issues with the battery system and potentially avoid triggering code P1B99.

8. Can extreme weather conditions affect the performance of the Hybrid/Electric Vehicle Battery 61 Circuit and trigger OBDII code P1B99?

- Yes, extreme temperatures can impact the efficiency and performance of the battery system, potentially leading to issues that trigger the code P1B99.

9. Is it possible to drive the vehicle with OBDII code P1B99 related to Hybrid/Electric Vehicle Battery 61 Circuit Performance?

- It is not recommended to drive the vehicle when this code is present, as it can lead to further damage to the battery system and potentially affect the vehicle's drivability.

10. How can I prevent OBDII code P1B99 issues with Hybrid/Electric Vehicle Battery 61 Circuit Performance in the future?

- Regularly maintaining the hybrid/electric vehicle's battery system, following recommended service intervals, and addressing any warning signs promptly can help prevent code P1B99 from recurring.