AutoCodes – Chevrolet – P1B51 Chevrolet

P1B51 Chevrolet 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 Chevrolet 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 865

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

What does this mean?

What are the Possible Causes of the DTC P1B51 Chevrolet?

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

How to Fix the DTC P1B51 Chevrolet?

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 Chevrolet 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 Chevrolet Code

1. What are the common symptoms of OBDII code P1B51 in a Chevrolet hybrid/electric vehicle?

- Common symptoms include reduced electric driving range, poor fuel efficiency, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code P1B51 in a Chevrolet hybrid/electric vehicle?

- Possible causes may include a faulty hybrid/electric vehicle battery, damaged battery cells, loose electrical connections, or a malfunctioning battery management system.

3. How can I diagnose OBDII code P1B51 in my Chevrolet hybrid/electric vehicle?

- Diagnosis typically involves using a diagnostic scan tool to read the code, checking the battery's voltage levels, inspecting electrical connections, and conducting a battery health test.

4. Can I continue driving my Chevrolet hybrid/electric vehicle with OBDII code P1B51?

- It is not recommended to drive the vehicle with this code as it can lead to further damage to the hybrid/electric vehicle battery and affect the vehicle's performance.

5. How can I repair OBDII code P1B51 in my Chevrolet hybrid/electric vehicle?

- Repair may involve replacing the hybrid/electric vehicle battery, repairing damaged battery cells, tightening loose connections, or recalibrating the battery management system.

6. Is it safe to attempt repairs for OBDII code P1B51 in a Chevrolet hybrid/electric vehicle myself?

- Due to the complexity of hybrid/electric vehicle systems, it is recommended to seek assistance from a qualified technician or dealership for proper diagnosis and repair.

7. How much does it typically cost to repair OBDII code P1B51 in a Chevrolet hybrid/electric vehicle?

- The cost of repair can vary depending on the specific issue, but it may range from a few hundred to a few thousand dollars, especially if the hybrid/electric vehicle battery needs replacement.

8. Can OBDII code P1B51 be triggered by other underlying issues in a Chevrolet hybrid/electric vehicle?

- Yes, other issues such as charging system malfunctions, temperature sensor failures, or software glitches can also trigger this code in a hybrid/electric vehicle.

9. Will resetting the OBDII code P1B51 in my Chevrolet hybrid/electric vehicle make the issue go away?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the code to trigger in the first place.

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

- It is recommended to have the battery system checked regularly as part of routine maintenance, especially if you notice any changes in the vehicle's performance or efficiency.