AutoCodes – Cadillac – P1BC5 Cadillac

P1BC5 Cadillac Code - Hybrid/Electric Vehicle Battery 75 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: P1BC5 Cadillac indicates Hybrid/Electric Vehicle Battery 75 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 849

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 P1BC5 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 P1BC5 Cadillac - Hybrid/Electric Vehicle Battery 75 Circuit High Voltage - AutoCodes.com — P1BC5 Cadillac Code - Hybrid/Electric Vehicle Battery 75 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1BC5 Cadillac?

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

How to Fix the DTC P1BC5 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 P1BC5 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 P1BC5 Cadillac Code

What does the OBDII code P1BC5 mean on a Cadillac?

The code P1BC5 indicates an issue with the Hybrid/Electric Vehicle Battery 75 Circuit, specifically detecting high voltage in the circuit.

What are common symptoms of code P1BC5 on a Cadillac?

Symptoms may include reduced fuel efficiency, limited hybrid or electric vehicle performance, warning lights on the dashboard, or the vehicle entering a limp mode.

What causes the P1BC5 code on a Cadillac?

Possible causes include a malfunctioning battery module, wiring issues, connector damage, or problems with the hybrid control module.

Can driving with code P1BC5 damage the vehicle?

Yes, continued driving with this code can lead to further damage to the hybrid battery system and may affect overall vehicle performance.

How is the P1BC5 code diagnosed on a Cadillac?

Diagnosis typically involves scanning the vehicleâ€™s computer, inspecting the battery circuit wiring and connectors, and testing the hybrid battery modules for faults.

What repairs can fix the P1BC5 code on a Cadillac?

Repairs may include replacing damaged wiring, repairing connectors, or replacing faulty battery modules or the hybrid control module.

Is the P1BC5 code specific to Cadillacs?

While this code is commonly seen on Cadillacs with hybrid or electric systems, it may also appear on other GM vehicles with similar powertrain configurations.

How much does it cost to repair the P1BC5 code?

Repair costs vary based on the specific issue but may range from $200 for minor wiring repairs to over $1,000 for hybrid battery module replacements.

Can a weak 12V battery cause the P1BC5 code on a Cadillac?

While unlikely, a weak 12V battery can sometimes cause communication errors in hybrid systems, so itâ€™s worth checking the batteryâ€™s condition.

Do I need a dealership to fix the P1BC5 code on my Cadillac?

While dealerships are equipped to handle hybrid system repairs, experienced independent mechanics with hybrid expertise can also diagnose and resolve this issue.