AutoCodes – Cadillac – P1B27 Cadillac

P1B27 Cadillac 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 Cadillac 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 776

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

What does this mean?

What are the Possible Causes of the DTC P1B27 Cadillac?

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

How to Fix the DTC P1B27 Cadillac?

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 Cadillac 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 Cadillac Code

What does the OBDII code P1B27 mean for a Cadillac hybrid or electric vehicle?

P1B27 indicates that there is a high voltage issue in the battery circuit 32 of the hybrid or electric vehicle system.

What are common symptoms associated with the P1B27 code?

Common symptoms may include reduced engine power, battery charging issues, warning lights on the dashboard, and overall poor performance of the hybrid system.

What could cause the P1B27 code to trigger?

Causes may include a faulty battery management system, damaged wiring or connectors, a defective battery pack, or issues with the vehicle's power electronics.

How can I diagnose the issue related to the P1B27 code?

To diagnose the issue, use an OBDII scanner to confirm the code, inspect wiring and connectors for damage, and test the battery management system and battery pack for proper functionality.

What are some common repairs for the P1B27 code?

Common repairs may involve replacing damaged wiring or connectors, repairing the battery management system, or replacing the battery pack if it is found to be defective.

Is it safe to drive a Cadillac with the P1B27 code?

It is generally not recommended to drive the vehicle with this code, as it may lead to reduced performance and could pose safety risks.

Can I clear the P1B27 code after repairs?

Yes, after performing the necessary repairs, you can clear the code using an OBDII scanner. However, ensure that the issue is resolved to prevent the code from returning.

How much might it cost to repair the issue associated with the P1B27 code?

Repair costs can vary widely based on the specific problem, ranging from a few hundred dollars for wiring repairs to several thousand dollars for battery pack replacements.

What should I do if the P1B27 code keeps returning?

If the code keeps returning, itâ€™s essential to have a qualified technician perform a thorough diagnosis to identify any underlying issues that may not have been addressed.