AutoCodes – Generic – P1B27

P1B27 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 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 1,841

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

What does this mean?

What are the Possible Causes of the DTC P1B27?

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

How to Fix the DTC P1B27?

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 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.

Need more information about the P1B27 code?

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Need Help with the Code?

Get the P1B27 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B27 Buick — Hybrid/Electric Vehicle Battery 32 Circuit High Voltage
P1B27 Cadillac — Hybrid/Electric Vehicle Battery 32 Circuit High Voltage
P1B27 Chevrolet — Hybrid/Electric Vehicle Battery 32 Circuit High Voltage
P1B27 GMC — Hybrid/Electric Vehicle Battery 32 Circuit High Voltage
P1B27 Saturn — Hybrid/Electric Vehicle Battery 32 Circuit High Voltage

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 Code

1. What are common symptoms of OBDII code P1B27 (Hybrid/Electric Vehicle Battery 32 Circuit High Voltage)?

- Common symptoms include poor fuel efficiency, reduced power, and the illumination of the check engine light.

2. What are possible causes of OBDII code P1B27?

- Possible causes include a faulty high voltage battery, issues with the battery management system, or problems with the battery pack cooling system.

3. How can I diagnose the OBDII code P1B27?

- Diagnosing the code typically involves using a professional diagnostic scanner to read the code and assess the high voltage battery system for any issues.

4. What should I do if I encounter OBDII code P1B27?

- It is recommended to have the high voltage battery system inspected by a qualified technician to determine the exact cause of the code and proceed with necessary repairs.

5. Can I drive my vehicle with OBDII code P1B27?

- It is not advisable to continue driving the vehicle with this code present, as it may lead to further damage to the high voltage battery system or affect the vehicle's performance.

6. Are there any safety precautions to consider when dealing with OBDII code P1B27?

- When working on the high voltage battery system, always follow proper safety procedures outlined by the manufacturer to prevent electric shock or other hazards.

7. How much does it typically cost to repair OBDII code P1B27?

- The cost of repair can vary depending on the underlying issue causing the code, but it may involve replacing components in the high voltage battery system.

8. Can I reset the OBDII code P1B27 on my own?

- While you can clear the code with a diagnostic scanner, it is important to address the root cause of the issue to prevent the code from reappearing.

9. Is OBDII code P1B27 specific to certain hybrid or electric vehicle models?

- This code is typically specific to hybrid or electric vehicles that use the OBDII diagnostic system, but the specific circuit and voltage levels may vary between models.

10. What maintenance tips can help prevent OBDII code P1B27 from occurring?

- Regularly maintaining the high voltage battery system, checking for leaks or damage, and following the manufacturer's recommended service schedule can help prevent this code from appearing.