AutoCodes – GMC – P1B51 GMC

P1B51 GMC 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 GMC 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 841

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

What does this mean?

What are the Possible Causes of the DTC P1B51 GMC?

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

How to Fix the DTC P1B51 GMC?

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 GMC 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 GMC Code

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

- The common symptoms include reduced electric vehicle range, poor performance, and potential issues with charging the battery.

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

- The code can be triggered by issues such as a faulty battery, damaged wiring in the battery circuit, or problems with the battery management system.

3. How can I diagnose the cause of OBDII code P1B51 GMC for Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- Diagnosing the issue may involve using a diagnostic scanner to read the code, checking the battery connections, inspecting the wiring harness, and testing the voltage levels in the battery circuit.

4. What are the repair options for resolving OBDII code P1B51 GMC concerning Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- Repair options may include replacing the damaged battery, repairing any faulty wiring, resetting the battery management system, or seeking professional assistance from a certified technician.

5. Can driving with OBDII code P1B51 GMC for Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage cause further damage to the vehicle?

- Continuing to drive with this code can potentially worsen the battery performance and lead to more severe issues with the hybrid/electric system, so it is recommended to address the problem promptly.

6. How can I prevent OBDII code P1B51 GMC related to Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage from occurring?

- Regular maintenance of the hybrid/electric vehicle system, including checking the battery health and monitoring the charging process, can help prevent issues that may trigger this code.

7. Is it safe to attempt to reset OBDII code P1B51 GMC for Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage on my own?

- While you can attempt to reset the code using a diagnostic scanner, it is important to diagnose and address the underlying issue causing the code to ensure the safety and proper functioning of the vehicle.

8. How long does it typically take to repair OBDII code P1B51 GMC for Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- The repair time can vary depending on the specific cause of the code, but it may take anywhere from a few hours to a day to diagnose and fix the issue properly.

9. Are there any specific tools or equipment required to repair OBDII code P1B51 GMC related to Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- Specialized diagnostic scanners, multimeters for measuring voltage, and basic hand tools may be needed to diagnose and repair the underlying cause of the code.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P1B51 GMC for Hybrid/Electric Vehicle Battery 37 Circuit Low Voltage?

- While some basic troubleshooting and repairs may be possible for DIY enthusiasts, addressing complex issues related to hybrid/electric vehicle systems should be left to trained professionals to ensure safety and proper functioning.