AutoCodes – Buick – P1B2C Buick

P1B2C Buick Code - Hybrid/Electric Vehicle Battery 31 Circuit

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: P1B2C Buick indicates Hybrid/Electric Vehicle Battery 31 Circuit.
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 946

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 P1B2C Buick 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 P1B2C Buick - Hybrid/Electric Vehicle Battery 31 Circuit - AutoCodes.com — P1B2C Buick Code - Hybrid/Electric Vehicle Battery 31 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B2C Buick?

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

How to Fix the DTC P1B2C Buick?

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 P1B2C Buick 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 P1B2C Buick Code

1. What does the OBDII code P1B2C mean on a Buick?

The P1B2C code indicates an issue with the Hybrid/Electric Vehicle Battery 31 Circuit, typically referring to a fault in one of the battery modules or its associated wiring.

2. What are the symptoms of a P1B2C code on a Buick?

Common symptoms include a check engine light, reduced hybrid or EV performance, decreased fuel efficiency, or the vehicle entering "limp mode."

3. What causes the P1B2C code to appear?

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

4. Can I drive with a P1B2C code on my Buick?

Itâ€™s not recommended to drive with this code for extended periods, as it can further damage the hybrid battery or other components, and the vehicle may experience reduced performance.

5. How is the P1B2C code diagnosed?

A technician will use a scan tool to verify the code, inspect the hybrid battery and wiring for damage or corrosion, and test the voltage and resistance in the affected circuit.

6. How do I fix a P1B2C code on my Buick?

Repairs may involve replacing the faulty battery module, repairing or replacing damaged wiring, cleaning corroded connectors, or updating the battery management system software.

7. What tools are required to troubleshoot the P1B2C code?

Tools include an OBDII scanner, a multimeter for voltage and resistance testing, and possibly specialized equipment for hybrid battery diagnostics.

8. Is the P1B2C code covered under warranty for my Buick?

Hybrid battery components may be covered under the manufacturerâ€™s warranty, depending on the vehicle's age and mileage. Check with your dealership for details.

9. Can a weak 12V battery cause the P1B2C code?

While unlikely, a weak 12V battery can sometimes affect hybrid system diagnostics. Itâ€™s worth testing the 12V battery to rule it out as a contributing factor.

10. How much does it cost to fix the P1B2C code on a Buick?

The cost varies depending on whether a battery module needs replacement or if itâ€™s a simpler wiring issue. Repairs can range from a few hundred to several thousand dollars for hybrid battery replacement.