AutoCodes – Generic – P1B6B

P1B6B Code - Hybrid/Electric Vehicle Battery 45 Circuit High 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: P1B6B indicates Hybrid/Electric Vehicle Battery 45 Circuit High 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 854

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B6B 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 P1B6B - Hybrid/Electric Vehicle Battery 45 Circuit High Voltage - AutoCodes.com — P1B6B Code - Hybrid/Electric Vehicle Battery 45 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B6B?

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

How to Fix the DTC P1B6B?

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 P1B6B 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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Need Help with the Code?

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Information for Specific Makes

P1B6B Buick — Hybrid/Electric Vehicle Battery 45 Circuit High Voltage
P1B6B Cadillac — Hybrid/Electric Vehicle Battery 45 Circuit High Voltage
P1B6B Chevrolet — Hybrid/Electric Vehicle Battery 45 Circuit High Voltage
P1B6B GMC — Hybrid/Electric Vehicle Battery 45 Circuit High Voltage
P1B6B Saturn — Hybrid/Electric Vehicle Battery 45 Circuit High Voltage

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 P1B6B Code

1. What does OBDII code P1B6B mean?

P1B6B indicates that the Hybrid/Electric Vehicle Battery 45 circuit is experiencing a high voltage issue, which could affect the performance of the vehicle's hybrid or electric system.

2. What are the common symptoms of code P1B6B?

Symptoms may include a check engine light, reduced hybrid or electric vehicle performance, limited power output, or the vehicle entering limp mode.

3. What causes the P1B6B code?

Possible causes include a faulty battery module, a damaged high-voltage wiring harness, corroded electrical connections, or a malfunctioning battery management system.

4. Is it safe to drive with a P1B6B code?

Driving with this code is not recommended, as it could lead to further damage to the battery system or result in reduced vehicle performance.

5. How is the P1B6B code diagnosed?

A technician will use a scan tool to read the code, inspect the high-voltage battery circuit, check for wiring or connector damage, and test the battery management system.

6. Can a weak 12-volt battery cause the P1B6B code?

While unlikely, a weak 12-volt battery can sometimes cause related hybrid system issues. However, P1B6B specifically points to a high-voltage battery circuit issue.

7. How do you fix the P1B6B code?

Repairs may include replacing a damaged battery module, repairing or replacing high-voltage wiring, cleaning corroded connectors, or updating the battery management system software.

8. What tools are needed to repair a P1B6B code?

Specialized tools such as an OBDII scanner, multimeter for voltage testing, and insulated tools for handling high-voltage components are typically required.

9. Can a software update resolve the P1B6B code?

In some cases, a software update for the battery management system may resolve the issue, especially if the problem is related to system calibration.

10. How much does it cost to fix a P1B6B code?

Repair costs vary depending on the root cause but can range from $200 for minor repairs like wiring fixes to over $1,000 if the high-voltage battery module needs replacement.