AutoCodes – Chevrolet – P1B27 Chevrolet

P1B27 Chevrolet Code - Hybrid/Electric Vehicle Battery 32 Circuit High Voltage

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: P1B27 Chevrolet indicates Hybrid/Electric Vehicle Battery 32 Circuit High Voltage.
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 915

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 P1B27 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 P1B27 Chevrolet - Hybrid/Electric Vehicle Battery 32 Circuit High Voltage - AutoCodes.com — P1B27 Chevrolet Code - Hybrid/Electric Vehicle Battery 32 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B27 Chevrolet?

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

How to Fix the DTC P1B27 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 P1B27 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 P1B27 Chevrolet Code

1. What does the OBDII code P1B27 mean on a Chevrolet?

P1B27 indicates a problem with the Hybrid/Electric Vehicle Battery 32 Circuit High Voltage, commonly related to a fault in the battery pack or its associated wiring.

2. What are the symptoms of code P1B27 in a Chevrolet?

Symptoms may include a check engine light, reduced hybrid or electric performance, limited driving range, or the vehicle entering a limp mode.

3. What causes the P1B27 code to appear?

Common causes include a damaged high-voltage battery cell, corroded connections, faulty battery control module, or a short/open in the circuit wiring.

4. Can I drive my Chevrolet with the P1B27 code active?

It is not recommended to drive the vehicle as this code can indicate a serious issue with the high-voltage battery, potentially leading to further damage or safety risks.

5. How is the P1B27 code diagnosed?

A technician will use a scan tool to retrieve the code, inspect the high-voltage battery and wiring for damage, and test the battery control module for faults.

6. What repairs can fix the P1B27 code?

Repairs may involve replacing a faulty battery cell, repairing or replacing damaged wiring, cleaning corroded terminals, or replacing the battery control module.

7. How much does it cost to fix the P1B27 code on a Chevrolet?

Repair costs vary but can range from a few hundred dollars for wiring repairs to several thousand dollars if the high-voltage battery needs replacement.

8. Can the P1B27 code be cleared without repairs?

Clearing the code without addressing the underlying issue is not recommended, as the problem will likely return and could lead to further complications.

9. What tools are needed to diagnose the P1B27 code?

Diagnosis typically requires an advanced scan tool capable of reading hybrid/electric vehicle systems, a multimeter, and possibly specialized equipment for high-voltage systems.

10. Is the P1B27 code covered under warranty?

High-voltage battery issues may be covered under the hybrid/electric vehicle warranty, often longer than the standard warranty. Check your Chevrolet warranty terms for details.