AutoCodes – GMC – P1B1B GMC

P1B1B GMC Code - Hybrid/Electric Vehicle Battery 28 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: P1B1B GMC indicates Hybrid/Electric Vehicle Battery 28 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 976

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 P1B1B 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 P1B1B GMC - Hybrid/Electric Vehicle Battery 28 Circuit High Voltage - AutoCodes.com — P1B1B GMC Code - Hybrid/Electric Vehicle Battery 28 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B1B GMC?

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

How to Fix the DTC P1B1B 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 P1B1B 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 P1B1B GMC Code

What does the OBDII code P1B1B mean in a GMC vehicle?

The OBDII code P1B1B indicates a problem with the Hybrid/Electric Vehicle Battery 28 Circuit, specifically that it is experiencing high voltage conditions.

What symptoms might I experience if my GMC has the P1B1B code?

Common symptoms include reduced power output, warning lights on the dashboard, poor fuel efficiency, and potential issues with the vehicle's hybrid system performance.

What are the potential causes of the P1B1B code?

Possible causes include a faulty battery management system, damaged wiring or connectors in the battery circuit, or issues with the hybrid battery itself.

How can I diagnose the P1B1B code in my GMC?

Start by using an OBDII scanner to confirm the code and check for additional codes. Inspect the wiring and connectors for damage, and test the hybrid battery and battery management system.

Is it safe to drive my GMC with the P1B1B code?

It is not recommended to drive the vehicle with this code as it may lead to reduced performance and could potentially cause further damage to the hybrid system.

What repairs are typically needed to fix the P1B1B code?

Repairs may involve replacing damaged wiring or connectors, servicing or replacing the hybrid battery, or repairing the battery management system.

Can I clear the P1B1B code without fixing the issue?

While you can clear the code using an OBDII scanner, it is important to address the underlying issue to prevent potential safety hazards and ensure proper vehicle operation.

How much might it cost to repair the issue related to the P1B1B code?

Repair costs can vary widely depending on the specific problem, ranging from a few hundred dollars for wiring repairs to several thousand for battery replacement.

Are there any preventive measures to avoid the P1B1B code?

Regular maintenance of the hybrid system, including battery inspections and ensuring all connections are secure, can help prevent issues that may trigger the P1B1B code.