AutoCodes – Chevrolet – P1B20 Chevrolet

P1B20 Chevrolet 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 Chevrolet 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 991

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 Chevrolet 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 Chevrolet - Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage - AutoCodes.com — P1B20 Chevrolet Code - Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B20 Chevrolet?

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

How to Fix the DTC P1B20 Chevrolet?

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 Chevrolet 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 Chevrolet Code

1. What are common symptoms of OBDII code P1B20 in a Chevrolet hybrid/electric vehicle?

- Common symptoms include reduced engine power, poor fuel efficiency, and the illumination of the check engine light.

2. What could cause the OBDII code P1B20 indicating Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage in a Chevrolet?

- Possible causes include a faulty battery pack, damaged battery cells, loose electrical connections, or issues with the battery management system.

3. How can I diagnose the OBDII code P1B20 in my Chevrolet hybrid/electric vehicle?

- Diagnosis typically involves using a scan tool to read the code, checking the battery voltage levels, inspecting the battery pack and connections for damage, and testing the battery cells.

4. Can I continue driving my Chevrolet with the OBDII code P1B20 present?

- It is not recommended to drive your vehicle with this code present, as it can lead to further damage to the battery system and affect the vehicle's performance.

5. What are some repair tips for fixing the OBDII code P1B20 in a Chevrolet hybrid/electric vehicle?

- Repair tips may include tightening loose connections, replacing damaged battery cells, resetting the battery management system, or replacing the battery pack if necessary.

6. Is it safe to attempt DIY repairs for the OBDII code P1B20 in my Chevrolet?

- It is recommended to seek professional help or consult a qualified technician when dealing with issues related to the hybrid/electric vehicle battery system to ensure proper diagnosis and repair.

7. How much does it typically cost to repair the OBDII code P1B20 in a Chevrolet hybrid/electric vehicle?

- The cost of repair can vary depending on the extent of the damage and the specific components that need to be replaced. It is advisable to get a quote from a trusted mechanic or dealership.

8. Can a weak or failing hybrid/electric vehicle battery cause the OBDII code P1B20 to appear?

- Yes, a weak or failing battery can trigger the code P1B20 due to low voltage in the battery circuit, which may indicate a need for battery replacement or repair.

9. Are there any preventive measures to avoid encountering the OBDII code P1B20 in a Chevrolet hybrid/electric vehicle?

- Regular maintenance of the battery system, monitoring battery health, and addressing any warning signs promptly can help prevent issues leading to the code P1B20.

10. How urgent is it to address the OBDII code P1B20 in a Chevrolet hybrid/electric vehicle?

- It is advisable to address the code P1B20 promptly to prevent further damage to the vehicle's battery system and ensure optimal performance of the hybrid/electric components.