AutoCodes – GMC – P1B20 GMC

P1B20 GMC Code - Hybrid/Electric Vehicle Battery 30 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: P1B20 GMC indicates Hybrid/Electric Vehicle Battery 30 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 915

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B20 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 P1B20 GMC - Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage - AutoCodes.com — P1B20 GMC Code - Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B20 GMC?

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

How to Fix the DTC P1B20 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 P1B20 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 P1B20 GMC Code

1. What are the common symptoms of OBDII code P1B20 GMC related to the Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- Common symptoms include reduced electric vehicle range, poor battery performance, and potential inability to start the vehicle.

2. What are some possible causes of OBDII code P1B20 GMC indicating Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- Possible causes may include a faulty battery pack, issues with battery cooling system, damaged battery cells, or problems with the battery management system.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage issue associated with OBDII code P1B20 GMC?

- Diagnosis typically involves using a diagnostic scanner to read the code, checking the battery voltage levels, inspecting the battery connections, and testing the battery components for any faults.

4. Is it safe to continue driving with OBDII code P1B20 GMC triggered for Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- It is not recommended to continue driving with this code triggered as it can lead to further damage to the vehicle's electric system and potentially cause safety risks.

5. Can I reset the OBDII code P1B20 GMC related to Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage myself?

- While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

6. What are some repair tips for fixing OBDII code P1B20 GMC indicating Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- Repair tips may include checking and replacing damaged battery components, ensuring proper battery cooling system function, and updating the battery management system software.

7. How much does it typically cost to repair OBDII code P1B20 GMC associated with Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- The cost of repair can vary depending on the extent of the issue, parts needed for replacement, and labor charges. It is advisable to consult a professional mechanic for an accurate estimate.

8. Are there any preventive measures to avoid encountering OBDII code P1B20 GMC for Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage in the future?

- Regular maintenance of the hybrid/electric vehicle's battery system, including monitoring battery health, checking connections, and following manufacturer's guidelines, can help prevent such issues.

9. Can a DIY enthusiast with basic automotive knowledge troubleshoot OBDII code P1B20 GMC related to Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- While basic troubleshooting steps like checking connections can be done by a DIY enthusiast, diagnosing and repairing complex issues related to the hybrid/electric vehicle battery system may require professional expertise.

10. Will driving a vehicle with OBDII code P1B20 GMC for Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage affect the overall performance of the vehicle?

- Driving with this code triggered can impact the vehicle's performance, especially in electric mode, and may lead to decreased efficiency and potential drivability issues.