AutoCodes – GMC – P0B51 GMC

P0B51 GMC 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 GMC 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.

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Code Popularity 995

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

What does this mean?

What are the Possible Causes of the DTC P0B51 GMC?

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

How to Fix the DTC P0B51 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 P0B51 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 P0B51 GMC Code

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

- Common symptoms include decreased fuel efficiency, difficulty starting the vehicle, and the hybrid system not functioning properly.

2. What can cause the Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage code P0B51 in a GMC?

- Possible causes include a faulty hybrid battery, issues with the battery management system, damaged wiring, or a malfunctioning battery cell.

3. How can I diagnose the OBDII code P0B51 in a GMC Hybrid/Electric Vehicle?

- Diagnosing this code typically involves using a scan tool to read the code, checking the hybrid battery voltage levels, and inspecting the battery connections for any signs of damage.

4. Can driving with the P0B51 code present cause further damage to my GMC Hybrid/Electric Vehicle?

- Continuing to drive with this code present can potentially damage the hybrid battery or other components of the vehicle's electrical system. It is recommended to address the issue promptly.

5. What are some repair tips for addressing the Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage code in a GMC?

- Repair tips may include checking and cleaning the battery connections, testing the hybrid battery cells, replacing any damaged wiring, and resetting the system after repairs are made.

6. Is it safe to drive a GMC Hybrid/Electric Vehicle with the P0B51 code if the vehicle seems to be operating normally?

- While the vehicle may seem to operate normally with this code present, it is still recommended to have the issue diagnosed and repaired to prevent potential damage to the hybrid system.

7. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage code in a GMC?

- The cost of repairs can vary depending on the specific issue causing the code, the extent of the damage, and whether any parts need to be replaced. It is advisable to consult a professional for an accurate estimate.

8. Can a DIY enthusiast with basic automotive knowledge attempt to fix the P0B51 code in a GMC Hybrid/Electric Vehicle?

- While some basic troubleshooting steps can be taken by DIY enthusiasts, diagnosing and repairing issues related to hybrid/electric vehicle systems can be complex and may require specialized tools and expertise. Consulting a professional is often recommended.

9. Will resetting the OBDII code P0B51 in a GMC Hybrid/Electric Vehicle make the issue go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to reoccur. It is important to diagnose and repair the root cause of the problem.

10. How long does it typically take to repair the Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage code in a GMC?

- The repair time can vary depending on the exact nature of the issue, availability of parts, and the expertise of the technician. Some repairs may be completed in a few hours, while more complex issues could take longer.