AutoCodes – Buick – P1B2D Buick

P1B2D Buick Code - Hybrid/Electric Vehicle Battery 32 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: P1B2D Buick indicates Hybrid/Electric Vehicle Battery 32 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 820

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 P1B2D 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 P1B2D Buick - Hybrid/Electric Vehicle Battery 32 Circuit - AutoCodes.com — P1B2D Buick Code - Hybrid/Electric Vehicle Battery 32 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B2D Buick?

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

How to Fix the DTC P1B2D 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 P1B2D 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 P1B2D Buick Code

1. What does the OBDII code P1B2D mean for a Buick?

Code P1B2D indicates an issue with the Hybrid/Electric Vehicle Battery 32 Circuit, which typically involves a fault in the communication or performance of one of the battery's circuits.

2. What are the common symptoms of code P1B2D in a Buick?

Symptoms may include the check engine light or hybrid warning light illuminating, reduced hybrid system performance, or the vehicle entering a limp mode.

3. What causes the P1B2D code in a Buick?

Common causes include a faulty battery module, wiring issues such as damaged or corroded connectors, or a malfunction in the hybrid battery control module.

4. Can I drive my Buick with a P1B2D code?

Driving with this code is not recommended, as it may lead to reduced performance or further damage to the hybrid system components.

5. How is the P1B2D code diagnosed?

A technician will use a scan tool to read the code, inspect the battery circuitâ€™s wiring and connectors, and perform tests on the hybrid battery module and control systems.

6. What repairs can fix the P1B2D code on a Buick?

Repairs may include replacing a defective battery module, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the hybrid battery control module.

7. How much does it cost to repair a P1B2D code on a Buick?

Repair costs can vary depending on the exact cause but may range from $200 for wiring repairs to over $1,000 for hybrid battery module replacement.

8. Can a dead 12V battery cause the P1B2D code?

While unlikely, a weak or dead 12V battery can sometimes cause hybrid system communication issues, so itâ€™s worth checking.

9. Will resetting the code fix the P1B2D issue in a Buick?

Resetting the code without addressing the underlying issue will not fix the problem, and the code is likely to return.

10. Does the P1B2D code mean the entire hybrid battery needs replacement?

Not necessarily; the issue could be isolated to a specific circuit or module within the battery, which may be repairable without replacing the entire battery pack.