AutoCodes – Cadillac – P1B8F Cadillac

P1B8F Cadillac Code - Hybrid/Electric Vehicle Battery 57 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: P1B8F Cadillac indicates Hybrid/Electric Vehicle Battery 57 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 720

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 P1B8F 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 P1B8F Cadillac - Hybrid/Electric Vehicle Battery 57 Circuit High Voltage - AutoCodes.com — P1B8F Cadillac Code - Hybrid/Electric Vehicle Battery 57 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B8F Cadillac?

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

How to Fix the DTC P1B8F 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 P1B8F 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 P1B8F Cadillac Code

What does the OBDII code P1B8F mean for a Cadillac?

The code P1B8F indicates a high voltage issue in the Hybrid/Electric Vehicle Battery 57 Circuit, which is part of the vehicle's energy storage system.

What are common symptoms of the P1B8F code?

Symptoms may include warning lights on the dashboard, reduced fuel efficiency, diminished hybrid system performance, or difficulty starting the vehicle.

What causes the P1B8F code to appear?

Common causes include damaged wiring or connectors in the battery circuit, a failing battery module, or issues with the hybrid control module.

Can I drive my Cadillac with the P1B8F code active?

It is not recommended to drive with this code active, as it may compromise the performance of the hybrid system and lead to further damage.

How is the P1B8F code related to the hybrid battery?

The code refers to a high voltage issue in one of the circuits connected to the hybrid/electric battery, which can impact the battery's ability to function properly.

What tools are needed to diagnose the P1B8F code?

A professional-grade OBDII scanner capable of reading hybrid system codes is required to diagnose this issue accurately.

How can I fix the P1B8F code on my Cadillac?

Repair typically involves inspecting and repairing damaged wiring, replacing faulty connectors, or replacing the hybrid battery module if necessary.

Should I take my Cadillac to a professional for the P1B8F code?

Yes, diagnosing and repairing high-voltage hybrid systems should be performed by a qualified technician due to safety concerns and complexity.

How much does it cost to fix the P1B8F code?

Repair costs can vary widely depending on whether the issue is with wiring, connectors, or the hybrid battery, but repairs can range from a few hundred to several thousand dollars.

What preventive measures can help avoid the P1B8F code?

Regular maintenance and inspections of the hybrid system, including checking for damaged wiring and connectors, can help prevent this code.