AutoCodes – Chevrolet – P1B7A Chevrolet

P1B7A Chevrolet Code - Hybrid/Electric Vehicle Battery 50 Circuit High 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: P1B7A Chevrolet indicates Hybrid/Electric Vehicle Battery 50 Circuit High 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 905

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 P1B7A 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 P1B7A Chevrolet - Hybrid/Electric Vehicle Battery 50 Circuit High Voltage - AutoCodes.com — P1B7A Chevrolet Code - Hybrid/Electric Vehicle Battery 50 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B7A Chevrolet?

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

How to Fix the DTC P1B7A 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 P1B7A 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 P1B7A Chevrolet Code

1. What does the OBDII code P1B7A mean for a Chevrolet vehicle?

The P1B7A code indicates a fault in the Hybrid/Electric Vehicle Battery 50 circuit, specifically a high voltage issue detected by the vehicleâ€™s control system.

2. What are the common symptoms of the P1B7A code in a Chevrolet?

Symptoms may include the illumination of the check engine light, reduced hybrid or electric performance, limited driving range, or the vehicle entering limp mode.

3. What causes the P1B7A code to appear in a Chevrolet?

Common causes include faulty battery modules, wiring issues in the high-voltage circuit, a malfunctioning battery energy control module, or corrosion on electrical connections.

4. Can I drive my Chevrolet with the P1B7A code present?

Driving with this code is not recommended, as it can lead to further damage to the hybrid/electric battery system and reduced vehicle performance.

5. How is the P1B7A code diagnosed in a Chevrolet vehicle?

A technician will use a scan tool to retrieve the code, inspect the high-voltage battery circuit, check for damaged wiring or connectors, and test the battery energy control module.

6. How do you fix the P1B7A code on a Chevrolet?

Repairs may include replacing damaged wiring, cleaning or repairing connectors, reprogramming or replacing the battery energy control module, or replacing defective battery modules.

7. How much does it cost to repair the P1B7A code on a Chevrolet?

Repair costs vary depending on the root cause but generally range from $200 for wiring repairs to over $2,000 for battery module replacement.

8. Can a weak 12-volt battery cause the P1B7A code to appear?

While unlikely, a weak 12-volt battery can indirectly affect hybrid system performance, but the code typically points to high-voltage circuit issues.

9. Is the P1B7A code covered under warranty for Chevrolet vehicles?

Hybrid or electric battery-related issues may be covered under the vehicleâ€™s hybrid system warranty, which is typically longer than the standard warranty. Check with your dealership for specifics.

10. Can clearing the P1B7A code solve the issue temporarily?

Clearing the code may turn off the warning light temporarily, but the underlying issue will likely persist and trigger the code again. Proper diagnosis and repair are necessary.