AutoCodes – Saturn – P1B4A Saturn

P1B4A Saturn Code - Hybrid/Electric Vehicle Battery 34 Circuit High Voltage

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: P1B4A Saturn indicates Hybrid/Electric Vehicle Battery 34 Circuit High Voltage.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 787

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1B4A 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 P1B4A Saturn - Hybrid/Electric Vehicle Battery 34 Circuit High Voltage - AutoCodes.com — P1B4A Saturn Code - Hybrid/Electric Vehicle Battery 34 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B4A Saturn?

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

How to Fix the DTC P1B4A 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 P1B4A 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.

Need more information about the P1B4A Saturn code?

Need more information on how to fix the P1B4A Saturn code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B4A Saturn code diagnosed by a professional: Find a repair shop in your area

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 P1B4A Saturn Code

1. What does the OBDII code P1B4A mean on a Saturn?

The P1B4A code indicates a "Hybrid/Electric Vehicle Battery 34 Circuit High Voltage" issue, meaning the voltage in the circuit for battery module 34 is higher than expected.

2. What are the common symptoms of a P1B4A code on a Saturn?

Symptoms may include an illuminated check engine light, reduced hybrid or EV performance, warning messages on the dashboard, and possible difficulty starting the vehicle.

3. What causes the P1B4A code on a Saturn?

Common causes include a faulty battery module, damaged wiring or connectors in the circuit, a malfunctioning battery management system, or a degraded high-voltage battery.

4. Can the P1B4A code damage my vehicle if left unaddressed?

Yes, ignoring this code can lead to further damage to the hybrid battery or electrical components and may result in reduced fuel efficiency or drivability.

5. How can I diagnose the P1B4A code on my Saturn?

Diagnose the code using an advanced OBDII scanner capable of reading hybrid/EV systems, inspect the wiring and connectors for damage, and test the affected battery module.

6. How do I fix the P1B4A code on a Saturn?

Repairs may involve replacing the faulty battery module, repairing or replacing damaged wiring, or reprogramming the battery management system.

7. Is it safe to drive with a P1B4A code?

Itâ€™s not recommended to drive with this code as it may reduce vehicle performance and could lead to further damage to the hybrid system.

8. What tools are needed to address the P1B4A code?

You'll need an OBDII scanner with hybrid diagnostics, a multimeter for testing voltage, and appropriate safety gear for handling high-voltage systems.

9. Can a P1B4A code be caused by software issues?

Yes, in some cases, outdated or corrupted software in the battery management system could trigger this code.

10. Should I take my Saturn to a professional for a P1B4A code?

Yes, due to the complexity and high-voltage risks associated with hybrid/EV systems, itâ€™s best to have a certified technician perform the diagnosis and repairs.