AutoCodes – GMC – P0B3D GMC

P0B3D GMC Code - Hybrid/Electric Vehicle Battery 1 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: P0B3D GMC indicates Hybrid/Electric Vehicle Battery 1 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 1,573

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 P0B3D 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 P0B3D GMC - Hybrid/Electric Vehicle Battery 1 Circuit Low Voltage - AutoCodes.com — P0B3D GMC Code - Hybrid/Electric Vehicle Battery 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B3D GMC?

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

How to Fix the DTC P0B3D 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 P0B3D 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 P0B3D GMC Code

1. What does the OBDII code P0B3D mean on a GMC vehicle?

P0B3D indicates a "Hybrid/Electric Vehicle Battery 1 Circuit Low Voltage," meaning the voltage from the high-voltage battery circuit 1 is lower than expected.

2. What are common symptoms of the P0B3D code?

Symptoms may include a check engine light, reduced fuel efficiency, limited power output, warning messages on the dashboard, or the vehicle entering limp mode.

3. What causes the P0B3D code to appear?

Common causes include a faulty battery module, loose or corroded connections, damaged wiring in the battery circuit, or a malfunctioning battery control module.

4. Can driving with the P0B3D code cause further damage?

Yes, continued driving with this code can lead to further damage to the hybrid system or leave the vehicle unable to operate if the battery becomes completely inoperative.

5. How is the P0B3D code diagnosed?

A technician will inspect the battery circuit, check wiring and connections, test the battery module voltage, and use a scan tool to monitor hybrid system data.

6. Can a low 12V battery cause the P0B3D code?

While the 12V battery is not directly related to this code, a weak 12V battery may cause other hybrid system malfunctions, so it should be checked as part of the diagnosis.

7. How much does it typically cost to fix the P0B3D code?

Repair costs vary depending on the issue. Replacing a battery module can cost several hundred to a few thousand dollars, while repairing wiring or connections may cost less.

8. Can I clear the P0B3D code without fixing the problem?

While you can clear the code using an OBDII scanner, the issue will likely return unless the underlying problem is resolved.

9. Is the P0B3D code specific to GMC hybrid/electric vehicles?

Yes, this code is most commonly associated with GMC hybrid/electric models and relates to their high-voltage battery systems.

10. What should I check first when troubleshooting the P0B3D code?

Start by inspecting the high-voltage battery connections and wiring for damage, corrosion, or looseness before testing the battery module or control module.