AutoCodes – Saturn – P1B99 Saturn

P1B99 Saturn 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 Saturn 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 769

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

What does this mean?

What are the Possible Causes of the DTC P1B99 Saturn?

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

How to Fix the DTC P1B99 Saturn?

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 Saturn 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 P1B99 Saturn Code

1. What does the OBDII code P1B99 mean on a Saturn?

P1B99 indicates an issue with the "Hybrid/Electric Vehicle Battery 61 Circuit Performance," which typically relates to a performance or communication fault within the hybrid battery system.

2. What are the common symptoms of the P1B99 code on a Saturn?

Symptoms may include the check engine light or hybrid system warning light, reduced fuel efficiency, limited hybrid functionality, or the vehicle operating in reduced power or limp mode.

3. What causes the P1B99 code to appear?

The most common causes are faulty wiring or connectors in the hybrid battery circuit, a failing hybrid battery module, or a malfunctioning battery management system.

4. Can I drive my Saturn with the P1B99 code active?

While it may still be drivable, the vehicle could experience reduced performance or efficiency, and prolonged use without repairs may cause further damage to the hybrid system.

5. How is the P1B99 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the hybrid battery wiring and connectors for damage, and test the battery modules and control system components for faults.

6. What repairs are needed to fix the P1B99 code?

Repairs may include replacing damaged wiring or connectors, repairing or replacing the affected hybrid battery module, or addressing issues in the battery management system.

7. How much does it cost to fix the P1B99 code on a Saturn?

Repair costs vary depending on the issue but may range from $150 for wiring repairs to $1,000 or more if the hybrid battery or control module needs replacement.

8. Will resetting the code fix the P1B99 issue?

Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return as the fault persists.

9. Can a weak 12V battery cause the P1B99 code?

While unlikely, a weak 12V battery can sometimes trigger hybrid system faults. Testing the 12V battery is a good starting point during diagnostics.

10. What preventative maintenance can help avoid the P1B99 code?

Regularly inspect and maintain the hybrid battery system, check for corroded or loose connectors, and ensure the vehicle's cooling system for the battery operates correctly.