AutoCodes – GMC – P1B2D GMC

P1B2D GMC Code - Hybrid/Electric Vehicle Battery 32 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: P1B2D GMC indicates Hybrid/Electric Vehicle Battery 32 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 792

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 P1B2D 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 P1B2D GMC - Hybrid/Electric Vehicle Battery 32 Circuit - AutoCodes.com — P1B2D GMC Code - Hybrid/Electric Vehicle Battery 32 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B2D GMC?

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

How to Fix the DTC P1B2D 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 P1B2D 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 P1B2D GMC Code

1. What does the OBDII code P1B2D mean on a GMC vehicle?

P1B2D indicates an issue with the Hybrid/Electric Vehicle Battery 32 Circuit, which typically relates to a fault in the high-voltage battery system or its associated wiring.

2. What are the common symptoms of a P1B2D code on a GMC?

Symptoms may include a warning light on the dashboard, reduced fuel efficiency, diminished hybrid/electric performance, or the vehicle entering a limp mode.

3. What causes the P1B2D code to appear in GMC vehicles?

Common causes include damaged or corroded wiring, a faulty battery cell or module, poor connections in the battery circuit, or a malfunctioning battery management system.

4. Can I drive my GMC with a P1B2D code?

While the vehicle may still be drivable, it is not recommended to drive for extended periods as it could worsen the issue or lead to further damage to the hybrid system.

5. How is the P1B2D code diagnosed?

A technician will use a scan tool to read the code, inspect the high-voltage battery and its wiring for damage or corrosion, and perform voltage and resistance tests to identify the problem.

6. How do you fix the P1B2D code on a GMC?

Repairs may involve replacing damaged wiring, repairing bad connections, or replacing a faulty battery cell or module. In some cases, reprogramming the battery management system may also be needed.

7. What tools are required to troubleshoot the P1B2D code?

Diagnosing this code typically requires an OBDII scanner, a multimeter for electrical testing, and possibly specialized tools for handling high-voltage systems safely.

8. How much does it cost to repair a P1B2D code on a GMC?

Repair costs vary depending on the severity of the issue, ranging from $100 for wiring repairs to several thousand dollars if a battery module replacement is necessary.

9. Can a software update fix the P1B2D code?

In some cases, a software update for the vehicleâ€™s battery management system can resolve the issue, but it depends on the root cause of the problem.

10. Is the P1B2D code covered under warranty for GMC vehicles?

If your vehicle is still under the manufacturerâ€™s hybrid/electric battery warranty, repairs for this code may be covered. Check with your dealer for details.