AutoCodes – Cadillac – P1B5C Cadillac

P1B5C Cadillac Code - Hybrid/Electric Vehicle Battery 40 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: P1B5C Cadillac indicates Hybrid/Electric Vehicle Battery 40 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 755

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 P1B5C 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 P1B5C Cadillac - Hybrid/Electric Vehicle Battery 40 Circuit High Voltage - AutoCodes.com — P1B5C Cadillac Code - Hybrid/Electric Vehicle Battery 40 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B5C Cadillac?

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

How to Fix the DTC P1B5C 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 P1B5C 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 P1B5C Cadillac Code

1. What does the OBDII code P1B5C mean on a Cadillac?

P1B5C indicates a high voltage issue in the Hybrid/Electric Vehicle Battery 40 Circuit, typically related to the battery or its associated components.

2. What are the common symptoms of a P1B5C code on a Cadillac?

Symptoms may include warning lights on the dashboard, reduced hybrid/electric performance, decreased fuel efficiency, or a failure to operate in electric mode.

3. What causes the P1B5C code to appear on a Cadillac?

The code is usually caused by issues such as a damaged high-voltage battery cell, faulty wiring, poor connections, or a malfunctioning battery control module.

4. Can I drive my Cadillac with a P1B5C code?

It is not recommended to drive with this code active, as it could lead to further damage or result in unsafe vehicle operation due to high voltage issues.

5. How is the P1B5C code diagnosed?

A technician will use a diagnostic scanner to read the code, inspect the hybrid battery system, check for damaged wiring or connectors, and test the battery control module.

6. What repairs are needed to fix the P1B5C code?

Repairs may include replacing damaged battery cells, repairing or replacing wiring, addressing connection issues, or reprogramming or replacing the battery control module.

7. How much does it cost to repair a P1B5C code on a Cadillac?

Repair costs vary depending on the issue, but replacing a hybrid battery or control module can range from $1,000 to $5,000 or more.

8. Can a weak 12V battery trigger the P1B5C code?

No, the P1B5C code specifically relates to the high-voltage hybrid battery system, not the 12V battery.

9. Will resetting the code fix the P1B5C issue?

Resetting the code without addressing the underlying problem will not fix the issue and the code is likely to return.

10. How can I prevent the P1B5C code from occurring?

Regular maintenance of the hybrid system, ensuring proper cooling for the battery, and addressing any electrical issues promptly can help prevent this code.