AutoCodes – Saturn – P1B51 Saturn

P1B51 Saturn Code - Hybrid/Electric Vehicle Battery 37 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: P1B51 Saturn indicates Hybrid/Electric Vehicle Battery 37 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.

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Code Popularity 871

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 P1B51 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 P1B51 Saturn - Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage - AutoCodes.com — P1B51 Saturn Code - Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B51 Saturn?

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

How to Fix the DTC P1B51 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 P1B51 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 P1B51 Saturn Code

1. What are common symptoms of OBDII code P1B51 Saturn related to the Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- Common symptoms include poor fuel economy, reduced vehicle performance, and potential issues with the hybrid/electric system.

2. What are possible causes of the OBDII code P1B51 Saturn indicating Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- Possible causes may include a faulty battery pack, damaged wiring or connectors, issues with the battery management system, or problems with the hybrid/electric vehicle components.

3. How can I diagnose the OBDII code P1B51 Saturn related to the Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- Diagnosis typically involves using a scan tool to retrieve the specific fault code, inspecting the battery pack and related components for visible damage, and testing the voltage levels in the circuit.

4. What should I do if I encounter the OBDII code P1B51 Saturn and suspect a problem with the Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- It is recommended to consult a qualified mechanic or dealership specializing in hybrid/electric vehicles for a thorough diagnosis and proper repairs.

5. Can I continue driving my vehicle with the OBDII code P1B51 Saturn indicating Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to more serious issues and potential damage to the hybrid/electric system.

6. Are there any DIY repair tips for addressing the OBDII code P1B51 Saturn related to the Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- DIY repair is not recommended for this code, as it involves specialized knowledge and equipment for working on hybrid/electric vehicle systems.

7. How much does it typically cost to repair the OBDII code P1B51 Saturn and resolve the Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage issue?

- Repair costs can vary depending on the exact cause of the issue, but it is advisable to budget for potentially significant expenses when dealing with hybrid/electric vehicle components.

8. Can the OBDII code P1B51 Saturn be triggered by a simple battery issue in a hybrid/electric vehicle?

- Yes, a low voltage condition in the hybrid/electric vehicle's battery system can trigger the P1B51 code, highlighting the importance of maintaining the battery pack and related components.

9. How often should I have the hybrid/electric vehicle battery system inspected to prevent the OBDII code P1B51 Saturn from occurring?

- It is recommended to follow the manufacturer's guidelines for maintenance and have the battery system inspected regularly by a qualified technician to prevent issues like the P1B51 code.

10. Is the OBDII code P1B51 Saturn indicating Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage a common issue in Saturn hybrid/electric vehicles?

- While not extremely common, the P1B51 code can occur in Saturn hybrid/electric vehicles, highlighting the importance of proper maintenance and timely repairs for the battery system.