AutoCodes – Saturn – P1B4B Saturn

P1B4B Saturn Code - Hybrid/Electric Vehicle Battery 35 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: P1B4B Saturn indicates Hybrid/Electric Vehicle Battery 35 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 1,149

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B4B 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 P1B4B Saturn - Hybrid/Electric Vehicle Battery 35 Circuit Performance - AutoCodes.com — P1B4B Saturn Code - Hybrid/Electric Vehicle Battery 35 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B4B Saturn?

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

How to Fix the DTC P1B4B 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 P1B4B 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 P1B4B Saturn Code

1. What does the OBDII code P1B4B mean for a Saturn vehicle?

The P1B4B code indicates an issue with the Hybrid/Electric Vehicle Battery 35 Circuit Performance, meaning the vehicle's powertrain control module (PCM) has detected a problem in the performance or function of the battery circuit for cell 35.

2. What are the common symptoms of the P1B4B code?

Symptoms may include a check engine light, reduced hybrid/electric vehicle performance, decreased fuel efficiency, or limited electric-only driving range.

3. What causes the P1B4B code to appear?

Possible causes include a malfunctioning battery cell, poor wiring or connections in the battery circuit, a failing battery management system, or internal faults within the hybrid battery pack.

4. Can I drive my Saturn with the P1B4B code active?

While it may be possible to drive, continuing to do so could cause further damage to the hybrid battery system or result in reduced vehicle performance. It's best to address the issue promptly.

5. How is the P1B4B code diagnosed?

A technician will typically use a scan tool to inspect battery data, check wiring and connectors for damage or corrosion, and test the battery cells for irregularities.

6. What repairs can fix the P1B4B code?

Repairs may include replacing faulty battery cells, repairing damaged wiring or connectors, updating the battery management software, or replacing the hybrid battery pack if necessary.

7. How much does it cost to repair the P1B4B code?

Costs vary depending on the issue, ranging from a few hundred dollars for wiring repairs to several thousand for hybrid battery replacement.

8. Can the P1B4B code be caused by software issues?

Yes, outdated or corrupted battery management system software can sometimes trigger this code. A software update may resolve the problem in such cases.

9. How can I prevent the P1B4B code from recurring?

Regular maintenance of the vehicle, including inspecting the hybrid battery system and keeping electrical connections clean and secure, can help prevent this code from returning.

10. Is the P1B4B code unique to Saturn vehicles?

No, this code can appear in other hybrid or electric vehicles with similar battery systems, but the troubleshooting and repair steps may vary by make and model.