AutoCodes – GMC – P1B9D GMC

P1B9D GMC Code - Hybrid/Electric Vehicle Battery 62 Circuit Low 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: P1B9D GMC indicates Hybrid/Electric Vehicle Battery 62 Circuit Low 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 768

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1B9D 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 P1B9D GMC - Hybrid/Electric Vehicle Battery 62 Circuit Low Voltage - AutoCodes.com — P1B9D GMC Code - Hybrid/Electric Vehicle Battery 62 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B9D GMC?

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

How to Fix the DTC P1B9D 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 P1B9D 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.

Need more information about the P1B9D GMC code?

Need more information on how to fix the P1B9D GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B9D GMC code diagnosed by a professional: Find a repair shop in your area

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 P1B9D GMC Code

1. What are the common symptoms of OBDII code P1B9D GMC (Hybrid/Electric Vehicle Battery 62 Circuit Low Voltage)?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential illumination of the check engine light.

2. What can cause the OBDII code P1B9D GMC to trigger?

- This code is typically triggered by a low voltage condition in the Hybrid/Electric Vehicle Battery 62 Circuit, which can be caused by a faulty battery cell, wiring issues, or a malfunctioning battery management system.

3. How serious is the OBDII code P1B9D GMC (Hybrid/Electric Vehicle Battery 62 Circuit Low Voltage)?

- This code should be addressed promptly to prevent further damage to the hybrid system and ensure optimal vehicle performance.

4. What should I do if I encounter the OBDII code P1B9D GMC?

- It is recommended to have the vehicle inspected by a qualified technician to diagnose the exact cause of the low voltage condition and perform necessary repairs.

5. Can I continue driving my vehicle with the OBDII code P1B9D GMC active?

- It is not advisable to continue driving the vehicle with this code active, as it can lead to poor hybrid system performance and potential damage to the battery components.

6. How can I repair the OBDII code P1B9D GMC on my GMC hybrid/electric vehicle?

- Repair options may include replacing faulty battery cells, repairing wiring issues, resetting the battery management system, or addressing any other underlying causes of the low voltage condition.

7. Is the OBDII code P1B9D GMC specific to certain GMC hybrid/electric models?

- This code is specific to GMC hybrid/electric vehicles and relates to the Hybrid/Electric Vehicle Battery 62 Circuit Low Voltage.

8. Are there any DIY tips for troubleshooting the OBDII code P1B9D GMC?

- While basic checks like inspecting battery connections and ensuring proper charging can be done, diagnosing and repairing this code often requires specialized equipment and knowledge best left to professionals.

9. How can I prevent the recurrence of the OBDII code P1B9D GMC in the future?

- Regular maintenance of the hybrid/electric system, including monitoring battery health, can help prevent issues that may lead to the low voltage condition triggering this code.

10. Is resetting the OBDII code P1B9D GMC sufficient, or should I seek professional assistance?

- While resetting the code may temporarily clear the warning light, it is crucial to have the root cause diagnosed and repaired by a qualified technician to ensure the issue is properly resolved.