AutoCodes – Saturn – P0B4A Saturn

P0B4A Saturn Code - Hybrid/Electric Vehicle Battery 4 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: P0B4A Saturn indicates Hybrid/Electric Vehicle Battery 4 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 1,007

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 P0B4A 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 P0B4A Saturn - Hybrid/Electric Vehicle Battery 4 Circuit - AutoCodes.com — P0B4A Saturn Code - Hybrid/Electric Vehicle Battery 4 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B4A Saturn?

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

How to Fix the DTC P0B4A 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 P0B4A 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 P0B4A Saturn Code

1. What does the OBDII code P0B4A mean on a Saturn vehicle?

P0B4A indicates an issue with the Hybrid/Electric Vehicle Battery 4 Circuit, often related to a malfunction in the battery management system or a fault in the associated wiring or sensors.

2. What are the common symptoms of the P0B4A code?

Symptoms may include a check engine light or warning message, reduced fuel efficiency, decreased hybrid/electric performance, or the vehicle entering limp mode.

3. What causes the P0B4A code to appear?

Common causes include a faulty battery module, damaged wiring or connectors in the Battery 4 Circuit, a defective battery management system, or poor electrical connections.

4. Can I still drive my Saturn with the P0B4A code?

While it may be possible to drive, it is not recommended as the vehicle could experience reduced performance or further damage to the hybrid/electric system.

5. How is the P0B4A code diagnosed?

A technician will use a scan tool to confirm the code, inspect the battery circuit wiring and connections, test the battery module, and check the battery management system for faults.

6. What repairs can fix the P0B4A code?

Repairs may include replacing a faulty battery module, repairing damaged wiring or connectors, updating the battery management system software, or replacing the battery management system if necessary.

7. How much does it cost to fix the P0B4A code?

Repair costs can vary but may range from $200 to $2,000 depending on whether the issue involves wiring repairs, battery module replacement, or a more extensive battery system repair.

8. Can a low voltage battery cause the P0B4A code?

Yes, a low or failing battery can sometimes trigger this code if it affects the performance of the hybrid/electric battery system.

9. How can I prevent the P0B4A code from recurring?

Regular maintenance, monitoring the health of the hybrid battery, and addressing any electrical issues promptly can help prevent this code from recurring.

10. Is the P0B4A code specific to Saturn hybrid vehicles?

While it is common in Saturn hybrid models, the P0B4A code can also appear in other hybrid/electric vehicles with similar battery circuit configurations.