AutoCodes – GMC – P1B2A GMC

P1B2A GMC Code - Hybrid/Electric Vehicle Battery 29 Circuit

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: P1B2A GMC indicates Hybrid/Electric Vehicle Battery 29 Circuit.
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 815

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 P1B2A 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 P1B2A GMC - Hybrid/Electric Vehicle Battery 29 Circuit - AutoCodes.com — P1B2A GMC Code - Hybrid/Electric Vehicle Battery 29 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B2A GMC?

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

How to Fix the DTC P1B2A 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 P1B2A 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 P1B2A GMC Code

1. What are the common symptoms of OBDII code P1B2A for GMC Hybrid/Electric Vehicle Battery 29 Circuit?

The common symptoms include reduced fuel efficiency, loss of power, and the vehicle going into a reduced propulsion mode.

2. What are the possible causes of OBDII code P1B2A for GMC Hybrid/Electric Vehicle Battery 29 Circuit?

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

3. How can I diagnose the OBDII code P1B2A for GMC Hybrid/Electric Vehicle Battery 29 Circuit?

Diagnosis typically involves conducting a thorough inspection of the hybrid/electric vehicle battery components, checking for loose connections, and using a diagnostic scanner to retrieve specific fault codes.

4. Can I still drive my vehicle with the OBDII code P1B2A for GMC Hybrid/Electric Vehicle Battery 29 Circuit?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the hybrid/electric system and potentially unsafe driving conditions.

5. How can I repair OBDII code P1B2A for GMC Hybrid/Electric Vehicle Battery 29 Circuit?

Repair options may include replacing the hybrid/electric vehicle battery, repairing damaged wiring or connectors, or resetting the battery management system.

6. Is it safe to reset the OBDII code P1B2A for GMC Hybrid/Electric Vehicle Battery 29 Circuit without fixing the underlying issue?

Resetting the code without addressing the root cause may temporarily clear the warning light, but the issue will likely reoccur, leading to potential safety risks and further damage.

7. How much does it cost to repair OBDII code P1B2A for GMC Hybrid/Electric Vehicle Battery 29 Circuit?

The cost of repair can vary depending on the specific issue causing the code, the extent of the damage, and whether the repair is covered under warranty.

8. Can a DIY enthusiast fix the OBDII code P1B2A for GMC Hybrid/Electric Vehicle Battery 29 Circuit?

While some basic troubleshooting and repairs may be possible for experienced DIY enthusiasts, diagnosing and repairing complex hybrid/electric vehicle systems is best left to trained professionals.

9. What should I do if the OBDII code P1B2A for GMC Hybrid/Electric Vehicle Battery 29 Circuit keeps coming back after repairs?

If the code keeps reappearing after repairs, it may indicate an ongoing issue with the hybrid/electric system that requires further investigation by a qualified technician.

10. How often should I have the hybrid/electric system checked to prevent OBDII code P1B2A for GMC Hybrid/Electric Vehicle Battery 29 Circuit?

Regular maintenance checks and inspections of the hybrid/electric system are recommended to catch any potential issues early and prevent the occurrence of OBDII codes like P1B2A.