AutoCodes – GMC – P1B5B GMC

P1B5B GMC Code - Hybrid/Electric Vehicle Battery 40 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: P1B5B GMC indicates Hybrid/Electric Vehicle Battery 40 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 760

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 P1B5B 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 P1B5B GMC - Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage - AutoCodes.com — P1B5B GMC Code - Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B5B GMC?

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

How to Fix the DTC P1B5B 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 P1B5B 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 P1B5B GMC Code

1. What are the common symptoms of OBDII code P1B5B GMC (Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage)?

- Common symptoms include reduced vehicle performance, poor fuel efficiency, and potential difficulty starting the vehicle.

2. What are the possible causes of OBDII code P1B5B GMC?

- The code P1B5B GMC may be triggered by issues such as a faulty hybrid/electric vehicle battery, damaged wiring in the battery circuit, or a weak battery connection.

3. How can I diagnose the OBDII code P1B5B GMC?

- Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the hybrid/electric vehicle battery and its connections, and testing the voltage levels in the battery circuit.

4. What are some repair tips for addressing code P1B5B GMC?

- Repair tips may include checking and tightening battery connections, replacing damaged wiring in the battery circuit, or replacing the hybrid/electric vehicle battery if necessary.

5. Is it safe to continue driving with OBDII code P1B5B GMC present?

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

6. Can a DIY enthusiast fix OBDII code P1B5B GMC at home?

- While some basic inspections and repairs can be done at home, diagnosing and repairing issues related to the hybrid/electric vehicle battery should be left to professionals with experience in handling such systems.

7. How much does it typically cost to repair OBDII code P1B5B GMC?

- The cost of repair can vary depending on the specific issue causing the code, but it may range from a few hundred to a few thousand dollars, especially if the hybrid/electric vehicle battery needs to be replaced.

8. What steps can I take to prevent OBDII code P1B5B GMC from occurring?

- Regularly inspecting and maintaining the hybrid/electric vehicle battery, ensuring proper battery connections, and following the manufacturer's recommended maintenance schedule can help prevent this code from appearing.

9. Can extreme weather conditions affect the likelihood of OBDII code P1B5B GMC appearing?

- Yes, extreme temperatures can impact the performance of the hybrid/electric vehicle battery, potentially leading to issues that trigger the code P1B5B GMC.

10. Are there any recalls or technical service bulletins related to OBDII code P1B5B GMC for specific GMC models?

- It is recommended to check with a GMC dealership or visit the National Highway Traffic Safety Administration (NHTSA) website for information on any recalls or technical service bulletins related to this specific OBDII code for GMC vehicles.