AutoCodes – GMC – P1B9A GMC

P1B9A GMC Code - Hybrid/Electric Vehicle Battery 61 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: P1B9A GMC indicates Hybrid/Electric Vehicle Battery 61 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.

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Code Popularity 873

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 P1B9A 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 P1B9A GMC - Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage - AutoCodes.com — P1B9A GMC Code - Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B9A GMC?

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

How to Fix the DTC P1B9A 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 P1B9A 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 P1B9A GMC Code

1. What are common symptoms of OBDII code P1B9A GMC (Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage)?

- Common symptoms include reduced hybrid system performance, difficulty starting the vehicle, and a decrease in fuel efficiency.

2. What causes OBDII code P1B9A GMC to trigger?

- This code is typically triggered by a low voltage condition in the hybrid/electric vehicle battery 61 circuit, which may be caused by a faulty battery, wiring issues, or a malfunctioning battery control module.

3. How can I diagnose the root cause of OBDII code P1B9A GMC?

- To diagnose this code, it is recommended to use a scan tool to check the voltage levels in the hybrid/electric vehicle battery 61 circuit, inspect the battery and related wiring for any damage, and perform a thorough visual inspection of the battery control module.

4. Are there any repair tips for fixing OBDII code P1B9A GMC?

- Repair tips for this code may include replacing the hybrid/electric vehicle battery if it is found to be faulty, repairing any damaged wiring in the circuit, and reprogramming or replacing the battery control module as needed.

5. Can I continue driving my vehicle with OBDII code P1B9A GMC present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric system and potentially leave you stranded on the road.

6. How serious is OBDII code P1B9A GMC?

- This code should be addressed promptly, as it indicates a low voltage condition in a critical circuit of the hybrid/electric vehicle system, which can impact the overall performance and safety of the vehicle.

7. Is it safe to attempt to clear OBDII code P1B9A GMC with a scan tool?

- While clearing the code may temporarily turn off the warning light, it is important to address the underlying issue causing the low voltage condition to prevent the code from reoccurring.

8. How much does it typically cost to repair OBDII code P1B9A GMC?

- The cost of repairing this code can vary depending on the specific cause, but it may involve expenses for parts such as a new battery, wiring repairs, and labor for diagnosis and repairs.

9. Can a DIY enthusiast resolve OBDII code P1B9A GMC on their own?

- While some basic troubleshooting steps can be taken by a DIY enthusiast, dealing with the hybrid/electric vehicle system and battery components may require specialized knowledge and tools, so it is advisable to seek professional assistance for this code.

10. Will OBDII code P1B9A GMC cause my vehicle to fail an emissions test?

- Yes, this code can cause your vehicle to fail an emissions test, as it indicates a problem with the hybrid/electric system that can impact the vehicle's emissions output. It is important to address the issue before undergoing an emissions test.