AutoCodes – GMC – P0B46 GMC

P0B46 GMC Code - Hybrid/Electric Vehicle Battery 3 Circuit Performance

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: P0B46 GMC indicates Hybrid/Electric Vehicle Battery 3 Circuit Performance.
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 856

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 P0B46 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 P0B46 GMC - Hybrid/Electric Vehicle Battery 3 Circuit Performance - AutoCodes.com — P0B46 GMC Code - Hybrid/Electric Vehicle Battery 3 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0B46 GMC?

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

How to Fix the DTC P0B46 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 P0B46 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 P0B46 GMC Code

1. What does the OBDII code P0B46 mean for a GMC vehicle?

It indicates an issue with the performance of the Hybrid/Electric Vehicle Battery 3 Circuit, often related to voltage or resistance abnormalities.

2. What are the common symptoms of the P0B46 code in a GMC?

Symptoms may include warning lights on the dashboard, reduced fuel efficiency, limited hybrid/electric performance, or the vehicle entering limp mode.

3. What causes the P0B46 code to appear on a GMC?

Common causes include a faulty battery cell, damaged wiring or connectors in the battery circuit, a malfunctioning battery module, or a failing battery management system.

4. Can I drive my GMC with the P0B46 code?

While the vehicle may still be drivable, it is not recommended as it could lead to further damage to the hybrid/electric system or reduced performance.

5. How do you diagnose the P0B46 code on a GMC?

Diagnosis typically involves scanning for codes, inspecting the battery and wiring in the Battery 3 Circuit, and testing the battery module for proper voltage and resistance.

6. How is the P0B46 code typically fixed in a GMC?

Repairs may include replacing a faulty battery cell, repairing or replacing damaged wiring, or reprogramming/updating the battery management system.

7. Does the P0B46 code mean the entire hybrid battery needs to be replaced?

Not necessarily. The issue may be isolated to a specific cell or circuit, which can often be repaired without replacing the entire battery pack.

8. How much does it cost to fix the P0B46 code on a GMC?

Costs vary widely depending on the specific repair, ranging from a few hundred dollars for wiring repairs to several thousand dollars if the hybrid battery requires replacement.

9. What tools are needed to troubleshoot the P0B46 code on a GMC?

Youâ€™ll need an OBDII scanner capable of reading hybrid system codes, a multimeter to test voltage and resistance, and potentially manufacturer-specific diagnostic tools.

10. Can a P0B46 code be triggered by extreme weather conditions?

Yes, extreme temperatures can affect battery performance and may contribute to triggering this code, especially if the battery is aging or compromised.