AutoCodes – Saturn – P0B51 Saturn

P0B51 Saturn Code - Hybrid/Electric Vehicle Battery 5 Circuit Low 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: P0B51 Saturn indicates Hybrid/Electric Vehicle Battery 5 Circuit Low 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 825

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
Add Comment

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

Code P0B51 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 P0B51 Saturn - Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage - AutoCodes.com — P0B51 Saturn Code - Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B51 Saturn?

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

How to Fix the DTC P0B51 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 P0B51 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 P0B51 Saturn code?

Need more information on how to fix the P0B51 Saturn code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0B51 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 P0B51 Saturn Code

1. What are the common symptoms of OBDII code P0B51 in a Saturn Hybrid/Electric Vehicle?

- Common symptoms include poor fuel efficiency, reduced power, and a check engine light illuminated on the dashboard.

2. What does the OBDII code P0B51 Saturn indicate regarding the Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage?

- This code indicates that there is a low voltage condition detected in the Hybrid/Electric Vehicle Battery 5 circuit.

3. What are the possible causes of OBDII code P0B51 in a Saturn Hybrid/Electric Vehicle?

- Possible causes include a faulty battery cell, corroded battery terminals, a damaged battery pack, or issues with the battery management system.

4. How can I diagnose the OBDII code P0B51 in my Saturn Hybrid/Electric Vehicle?

- Diagnosis usually involves using a scan tool to retrieve the code, inspecting the battery connections, checking the battery voltage, and performing a load test on the battery.

5. What are some repair tips for addressing OBDII code P0B51 in a Saturn Hybrid/Electric Vehicle?

- Repair tips may include cleaning the battery terminals, replacing damaged battery cells, performing a battery pack reset, or recalibrating the battery management system.

6. Can driving with OBDII code P0B51 in a Saturn Hybrid/Electric Vehicle cause further damage?

- Continuing to drive with this code may lead to further battery degradation, reduced performance, and potential safety hazards. It is recommended to address the issue promptly.

7. Is it safe to attempt DIY repairs for OBDII code P0B51 in a Saturn Hybrid/Electric Vehicle?

- While some simple tasks like checking battery connections can be done by DIY enthusiasts, more complex repairs related to the battery pack or management system should be handled by professionals.

8. How much can I expect to pay for repairs related to OBDII code P0B51 in a Saturn Hybrid/Electric Vehicle?

- The cost of repairs can vary widely depending on the specific issue, but it is recommended to budget for potential expenses related to battery diagnostics, replacement parts, and labor.

9. Are there any preventive maintenance measures to avoid encountering OBDII code P0B51 in a Saturn Hybrid/Electric Vehicle?

- Regularly inspecting the battery, maintaining proper charging habits, and following manufacturer-recommended service schedules can help prevent issues leading to this code.

10. How long can I safely drive with OBDII code P0B51 in a Saturn Hybrid/Electric Vehicle before getting it repaired?

- It is advisable not to drive for an extended period with this code present, as it can impact the vehicle's performance and potentially lead to more severe battery-related problems. Seek professional assistance as soon as possible.