AutoCodes – Buick – P1B19 Buick

P1B19 Buick 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 Buick 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 693

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

What does this mean?

What are the Possible Causes of the DTC P1B19 Buick?

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

How to Fix the DTC P1B19 Buick?

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 Buick 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 Buick Code

1. What does the OBDII code P1B19 mean for a Buick?

The P1B19 code indicates an issue with the performance of the Hybrid/Electric Vehicle Battery 28 Circuit, often related to voltage, current, or communication faults in battery cell 28.

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

Symptoms may include the check engine light being illuminated, reduced fuel efficiency, limited hybrid/electric system performance, or difficulty starting the vehicle.

3. What causes the P1B19 code in a Buick?

Common causes include faulty battery sensors, damaged wiring or connectors in the battery circuit, a defective hybrid battery cell/module, or a malfunctioning Battery Energy Control Module.

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

While it may still be drivable, the vehicle's performance may be reduced, and ignoring the issue could lead to further damage to the hybrid/electric battery system.

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

A technician will use a scan tool to read the code and analyze live data, inspect battery wiring and connectors for damage, and test the voltage and resistance of the affected battery circuit.

6. How do you fix the P1B19 code on a Buick?

Repairs may involve repairing or replacing damaged wiring or connectors, replacing a faulty battery sensor, or, in some cases, replacing the hybrid battery module.

7. Can a low-voltage battery cause the P1B19 code?

While the low-voltage (12V) battery typically doesn't directly cause this code, issues with it can interfere with the proper functioning of hybrid battery diagnostics.

8. How much does it cost to fix the P1B19 code on a Buick?

Repair costs can vary widely depending on the root cause, ranging from $100â€“$300 for wiring repairs to $1,000+ if a hybrid battery module replacement is needed.

9. Can I reset the P1B19 code myself?

You can clear the code with an OBDII scanner, but if the underlying issue isnâ€™t resolved, the code will likely return.

10. Is the P1B19 code covered under warranty for Buicks?

This may depend on the vehicle's age and mileage, but hybrid battery components are often covered under extended warranties or specific hybrid system warranties.