AutoCodes – Buick – P1B25 Buick

P1B25 Buick Code - Hybrid/Electric Vehicle Battery 32 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: P1B25 Buick indicates Hybrid/Electric Vehicle Battery 32 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 957

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B25 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 P1B25 Buick - Hybrid/Electric Vehicle Battery 32 Circuit Performance - AutoCodes.com — P1B25 Buick Code - Hybrid/Electric Vehicle Battery 32 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B25 Buick?

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

How to Fix the DTC P1B25 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 P1B25 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 P1B25 Buick Code

1. What does the OBDII code P1B25 on a Buick mean?

P1B25 indicates a "Hybrid/Electric Vehicle Battery 32 Circuit Performance" issue, which suggests a problem with the performance of a specific circuit within the hybrid or EV battery system.

2. What are the symptoms of P1B25 on a Buick?

Common symptoms include the check engine light or hybrid warning light turning on, reduced fuel efficiency, diminished hybrid system performance, or the vehicle entering limp mode.

3. What causes the P1B25 code to appear?

The code can be triggered by a faulty battery cell or module, corroded or damaged wiring in the battery circuit, a malfunctioning battery control module, or poor connections.

4. Can I drive my Buick with the P1B25 code active?

While the car may still be drivable, driving with this code can lead to reduced performance or further damage to the hybrid battery system. Itâ€™s best to address the issue promptly.

5. How do I diagnose a P1B25 code on my Buick?

Diagnosis involves scanning the vehicle with an OBDII scanner, inspecting the battery circuit wiring and connections, testing the battery control module, and checking the hybrid battery for faults.

6. What tools are needed to fix the P1B25 code?

Youâ€™ll need an OBDII scanner, a multimeter for checking electrical continuity, and potentially specialized tools for hybrid battery diagnostics and repairs.

7. How much does it cost to repair a P1B25 code on a Buick?

Repair costs vary depending on the issue. Fixing wiring or connections may cost a few hundred dollars, but replacing a hybrid battery can cost several thousand dollars.

8. Can a weak hybrid battery cause a P1B25 code?

Yes, a weak or failing hybrid battery can trigger this code due to poor circuit performance within the battery system.

9. Should the hybrid battery be replaced if the P1B25 code appears?

Not necessarily. The issue could be due to wiring or module problems. A thorough diagnosis is needed to determine if the battery itself is faulty.

10. Can I reset the P1B25 code without fixing the issue?

You can clear the code with an OBDII scanner, but if the underlying issue isnâ€™t resolved, the code will likely return and may lead to further complications.