AutoCodes – Saturn – P0B4F Saturn

P0B4F Saturn Code - Hybrid/Electric Vehicle Battery 5 Circuit

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: P0B4F Saturn indicates Hybrid/Electric Vehicle Battery 5 Circuit.
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 1,084

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B4F 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 P0B4F Saturn - Hybrid/Electric Vehicle Battery 5 Circuit - AutoCodes.com — P0B4F Saturn Code - Hybrid/Electric Vehicle Battery 5 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B4F Saturn?

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

How to Fix the DTC P0B4F 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 P0B4F 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 P0B4F Saturn Code

1. What does the OBDII code P0B4F mean on a Saturn vehicle?

The P0B4F code indicates an issue with the Hybrid/Electric Vehicle Battery 5 Circuit, specifically a problem with the electrical circuit or performance of the battery cell group labeled as "5."

2. What are the common symptoms of the P0B4F code?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, diminished electric range, warning messages on the dashboard, or the vehicle entering limp mode.

3. What causes the P0B4F code to appear?

Common causes include a faulty battery module, damaged wiring or connectors in the battery circuit, a malfunctioning battery management system, or internal short circuits within the battery pack.

4. Can I drive my Saturn with the P0B4F code?

While it may be possible to drive the vehicle, it's risky as it can lead to reduced performance, potential safety issues, or further damage to the hybrid/electric battery system.

5. How is the P0B4F code diagnosed?

A technician will typically use a scan tool to retrieve the code, inspect the battery circuit for wiring or connector issues, check the battery voltage levels, and test the battery management system.

6. What repairs can fix the P0B4F code?

Repairs may involve replacing a faulty battery cell or module, repairing or replacing damaged wiring or connectors, or updating the vehicle's battery management system software.

7. How much does it cost to fix the P0B4F code on a Saturn?

Repair costs can vary widely depending on the issue. Replacing a single battery module might cost a few hundred dollars, while replacing the entire battery pack could cost several thousand dollars.

8. Can a dead 12V battery cause the P0B4F code?

No, the P0B4F code is specifically related to the high-voltage hybrid/electric battery system, not the 12V battery.

9. Does the P0B4F code mean I need to replace the entire battery pack?

Not necessarily. In some cases, only a single battery cell or module needs replacement, though a full pack replacement might be required if extensive damage is found.

10. How can I prevent the P0B4F code from recurring?

Regular maintenance, avoiding extreme temperature exposure, and promptly addressing any hybrid system warnings can help prevent recurrence of the P0B4F code.