AutoCodes – Cadillac – P1BC8 Cadillac

P1BC8 Cadillac Code - Hybrid/Electric Vehicle Battery 76 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: P1BC8 Cadillac indicates Hybrid/Electric Vehicle Battery 76 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 803

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 P1BC8 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 P1BC8 Cadillac - Hybrid/Electric Vehicle Battery 76 Circuit High Voltage - AutoCodes.com — P1BC8 Cadillac Code - Hybrid/Electric Vehicle Battery 76 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1BC8 Cadillac?

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

How to Fix the DTC P1BC8 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 P1BC8 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 P1BC8 Cadillac Code

1. What does the OBDII code P1BC8 mean on a Cadillac?

The P1BC8 code indicates a "Hybrid/Electric Vehicle Battery 76 Circuit High Voltage" fault, meaning the voltage in one of the battery circuits is higher than expected.

2. What are the common symptoms of code P1BC8 on a Cadillac?

Symptoms include a check engine light, reduced hybrid or EV performance, limited power mode, and possible warnings related to the battery system.

3. What causes the P1BC8 code on a Cadillac?

This code can be triggered by a failed battery cell, a wiring issue, a defective battery control module, or a problem with the voltage sensors.

4. Can I drive my Cadillac with the P1BC8 code?

Driving with this code is not recommended, as it could lead to further damage to the hybrid battery system or reduced vehicle performance.

5. How is the P1BC8 code diagnosed?

A technician will use a scan tool to check for additional codes, inspect the hybrid battery circuits, test the voltage sensors, and examine related wiring for damage or corrosion.

6. What repairs are needed to fix the P1BC8 code on a Cadillac?

Repairs may involve replacing a faulty battery module, repairing or replacing damaged wiring, or recalibrating the battery control module.

7. How much does it cost to fix the P1BC8 code on a Cadillac?

Repair costs vary widely and depend on whether the issue is minor, like wiring repairs, or major, such as replacing parts of the hybrid battery system, which can cost thousands of dollars.

8. Can a weak 12V battery cause the P1BC8 code on a Cadillac?

While uncommon, a weak or failing 12V battery can sometimes contribute to hybrid system faults and should be tested as part of the diagnosis.

9. Is the P1BC8 code covered under the Cadillac hybrid battery warranty?

This depends on the age and mileage of your vehicle and the specific warranty terms. Consult your owner's manual or dealer for warranty coverage details.

10. Can clearing the P1BC8 code fix the problem on a Cadillac?

Clearing the code without addressing the underlying issue will not fix the problem and may cause the code to reappear. Proper diagnosis and repair are required.