AutoCodes – Generic – P1B81

P1B81 Code - Hybrid/Electric Vehicle Battery 53 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: P1B81 indicates Hybrid/Electric Vehicle Battery 53 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 1,427

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 P1B81 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 P1B81 - Hybrid/Electric Vehicle Battery 53 Circuit Performance - AutoCodes.com — P1B81 Code - Hybrid/Electric Vehicle Battery 53 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B81?

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

How to Fix the DTC P1B81?

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 P1B81 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

P1B81 Buick — Hybrid/Electric Vehicle Battery 53 Circuit Performance
P1B81 Cadillac — Hybrid/Electric Vehicle Battery 53 Circuit Performance
P1B81 Chevrolet — Hybrid/Electric Vehicle Battery 53 Circuit Performance
P1B81 GMC — Hybrid/Electric Vehicle Battery 53 Circuit Performance
P1B81 Saturn — Hybrid/Electric Vehicle Battery 53 Circuit Performance

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 P1B81 Code

1. What are common symptoms of OBDII code P1B81 (Hybrid/Electric Vehicle Battery 53 Circuit Performance)?

- Common symptoms include reduced hybrid battery performance, decreased fuel efficiency, and potential warning lights on the dashboard.

2. What can cause OBDII code P1B81 to trigger?

- This code can be triggered by issues such as a faulty battery pack, damaged battery cells, poor battery connection, or internal battery circuit problems.

3. How serious is OBDII code P1B81 (Hybrid/Electric Vehicle Battery 53 Circuit Performance)?

- This code indicates a potential issue with the hybrid/electric vehicle battery performance, which can affect the vehicle's overall efficiency and power delivery. It should be addressed promptly.

4. Can I still drive my vehicle with OBDII code P1B81 present?

- It is not recommended to continue driving the vehicle with this code active, as it can lead to further damage to the battery system and compromise the vehicle's performance.

5. How can I diagnose the underlying issue causing OBDII code P1B81?

- Proper diagnosis typically involves using a specialized diagnostic scanner to read the code, testing the battery cells and connections, and inspecting the battery pack for any visible damage.

6. What are some repair options for OBDII code P1B81?

- Repair options may include replacing damaged battery cells, repairing faulty connections, resetting the code, or seeking professional assistance to address internal battery circuit issues.

7. Is it safe to attempt repairs for OBDII code P1B81 on my own?

- Due to the complexity and high voltage nature of hybrid/electric vehicle batteries, it is recommended to consult a qualified technician or mechanic for proper diagnosis and repair to ensure safety and effectiveness.

8. How much does it typically cost to repair OBDII code P1B81?

- Repair costs for this code can vary depending on the extent of the issue, the need for battery cell replacement, and the labor involved. It is best to obtain estimates from reputable repair shops.

9. Can OBDII code P1B81 be a recurring issue even after repairs?

- If the underlying cause of the code is not fully addressed during repairs, there is a possibility of it recurring. Proper diagnosis and thorough repair work can help prevent this.

10. Are there any preventive maintenance tips to avoid OBDII code P1B81 in the future?

- Regularly inspecting the hybrid/electric vehicle battery system, maintaining proper charging habits, and addressing any warning signs promptly can help prevent issues that trigger this code.