AutoCodes – GMC – P1B19 GMC

P1B19 GMC 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 GMC 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 890

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

What does this mean?

What are the Possible Causes of the DTC P1B19 GMC?

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

How to Fix the DTC P1B19 GMC?

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 GMC 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 GMC Code

1. What does the OBDII code P1B19 mean for GMC vehicles?

The P1B19 code indicates a performance issue with the Hybrid/Electric Vehicle Battery 28 Circuit, often related to voltage irregularities or communication faults within the battery system.

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

Symptoms may include the hybrid system warning light, reduced fuel efficiency, limited power mode activation, or difficulty transitioning between electric and gas operation.

3. What can cause the P1B19 code to appear in a GMC?

Causes include a faulty battery module, damaged wiring or connectors in the battery circuit, a malfunctioning battery control module, or internal battery degradation.

4. How is the P1B19 code diagnosed?

A technician will use a scan tool to read the code, inspect the battery system for wiring or connector damage, and check the voltage levels of individual battery cells for irregularities.

5. Can you drive with a P1B19 code on a GMC vehicle?

Driving with this code is not recommended as it may lead to reduced hybrid system performance, potential further damage, or safety concerns.

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

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

7. Is the P1B19 code covered under warranty for GMC hybrid vehicles?

It may be covered under the hybrid/electric battery warranty, but coverage depends on the vehicle's age, mileage, and specific warranty terms.

8. What tools are needed to troubleshoot the P1B19 code?

A professional-grade scan tool, a multimeter for checking voltage, and access to the vehicle's wiring diagrams are essential for diagnosing this issue.

9. How much does it cost to repair the P1B19 code on a GMC hybrid vehicle?

Repair costs vary depending on the issue but can range from $200 for wiring repairs to over $1,000 for a battery module replacement.

10. Can a weak 12-volt battery cause the P1B19 code in a GMC?

While uncommon, a weak 12-volt battery can indirectly cause hybrid system issues, so itâ€™s worth testing the 12-volt battery as part of the diagnosis.