AutoCodes – Chevrolet – P1B81 Chevrolet

P1B81 Chevrolet 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 Chevrolet 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 842

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

What does this mean?

What are the Possible Causes of the DTC P1B81 Chevrolet?

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

How to Fix the DTC P1B81 Chevrolet?

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 Chevrolet 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 P1B81 Chevrolet Code

1. What does the OBDII code P1B81 mean for a Chevrolet vehicle?

P1B81 indicates a performance issue in the Hybrid/Electric Vehicle Battery 53 Circuit, which could signal a problem with the high-voltage battery or its associated wiring.

2. What are the common symptoms of the P1B81 code?

Symptoms may include reduced fuel efficiency, limited electric drive performance, warning lights on the dashboard, or the vehicle entering limp mode.

3. What causes the P1B81 code to appear?

Possible causes include a malfunctioning high-voltage battery module, damaged wiring or connectors in the battery circuit, or a fault in the battery control module.

4. Can I drive my Chevrolet with a P1B81 code?

While you may be able to drive, it is not recommended as the issue could worsen and may lead to reduced performance or potential damage to the hybrid/electric system.

5. How is the P1B81 code diagnosed?

A technician will use a scan tool to read the code, inspect the high-voltage battery system, and check for issues with wiring, connectors, and the battery control module.

6. How do I fix the P1B81 code on a Chevrolet?

Repairs typically involve replacing or repairing faulty wiring, connectors, or the high-voltage battery module. In some cases, reprogramming or replacing the battery control module may be necessary.

7. Does the P1B81 code always mean the battery needs replacement?

No, the issue could be with the wiring, connectors, or control module instead of the battery itself. A thorough diagnosis is essential before replacing the battery.

8. What tools are needed to troubleshoot the P1B81 code?

A professional-grade OBDII scan tool, a multimeter for circuit testing, and manufacturer-specific repair manuals are typically required for accurate diagnosis and repair.

9. Can the P1B81 code be cleared without repairs?

Clearing the code without addressing the underlying issue may temporarily remove the warning, but the code is likely to return as the problem persists.

10. Is the P1B81 code covered under warranty for Chevrolet vehicles?

Hybrid/electric vehicle battery components are often covered under extended warranties, but coverage details depend on the vehicle's age, mileage, and specific warranty terms.