AutoCodes – Cadillac – P1B19 Cadillac

P1B19 Cadillac Code - Hybrid/Electric Vehicle Battery 28 Circuit Performance

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: P1B19 Cadillac indicates Hybrid/Electric Vehicle Battery 28 Circuit Performance.
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 881

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 P1B19 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 P1B19 Cadillac - Hybrid/Electric Vehicle Battery 28 Circuit Performance - AutoCodes.com — P1B19 Cadillac Code - Hybrid/Electric Vehicle Battery 28 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B19 Cadillac?

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

How to Fix the DTC P1B19 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 P1B19 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 P1B19 Cadillac Code

1. What does the OBDII code P1B19 mean on a Cadillac?

P1B19 indicates an issue with the Hybrid/Electric Vehicle Battery 28 Circuit Performance, often related to a specific battery cell or its associated circuitry.

2. What are the common symptoms of code P1B19 in a Cadillac?

Symptoms may include reduced hybrid or electric vehicle performance, illuminated check engine light, limited driving range, or the inability to switch to electric mode.

3. What causes the P1B19 code in a Cadillac?

The code can be caused by a faulty hybrid battery cell, damaged wiring or connectors in the battery circuit, a malfunctioning battery management system (BMS), or software-related issues.

4. Can I drive my Cadillac with the P1B19 code active?

While the vehicle may still be drivable, reduced performance or range is likely. Driving for extended periods without addressing the issue could cause further damage.

5. How is the P1B19 code diagnosed in a Cadillac?

A technician will use a scan tool to check the battery management system, inspect the battery pack for faults, and test the wiring and connectors for continuity and proper operation.

6. What repairs are typically required for code P1B19 in a Cadillac?

Repairs may include replacing a faulty battery cell, repairing or replacing damaged wiring, updating the vehicle's software, or recalibrating the battery management system.

7. How much does it cost to fix the P1B19 code on a Cadillac?

Repair costs can vary widely, ranging from $200 for minor wiring repairs to over $1,000 if the hybrid battery or related components need replacement.

8. Can a software update fix the P1B19 code in a Cadillac?

In some cases, a software update to the battery management system or powertrain control module may resolve the issue if it's related to system calibration.

9. How can I prevent the P1B19 code from recurring in my Cadillac?

Regular maintenance, ensuring proper battery cooling, and addressing minor issues promptly can help prevent recurring P1B19 codes.

10. Does the P1B19 code always mean the hybrid battery is failing?

No, it doesnâ€™t always mean the hybrid battery is failing. It could be a minor issue with the circuitry, sensors, or connectors associated with the battery.