AutoCodes – Chevrolet – P1B66 Chevrolet

P1B66 Chevrolet Code - Hybrid/Electric Vehicle Battery 44 Circuit Performance

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: P1B66 Chevrolet indicates Hybrid/Electric Vehicle Battery 44 Circuit Performance.
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 908

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 P1B66 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 P1B66 Chevrolet - Hybrid/Electric Vehicle Battery 44 Circuit Performance - AutoCodes.com — P1B66 Chevrolet Code - Hybrid/Electric Vehicle Battery 44 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B66 Chevrolet?

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

How to Fix the DTC P1B66 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 P1B66 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 P1B66 Chevrolet Code

1. What does OBDII code P1B66 mean in a Chevrolet?

Code P1B66 indicates a performance issue with the Hybrid/Electric Vehicle Battery 44 Circuit, which could affect the operation of the hybrid or electric system.

2. What are the symptoms of code P1B66 in a Chevrolet?

Common symptoms include the check engine light turning on, reduced hybrid or electric performance, and potential loss of battery efficiency.

3. What causes the P1B66 code in a Chevrolet?

This code is typically caused by issues such as a faulty battery cell, damaged wiring or connectors in the circuit, or a malfunctioning battery control module.

4. Can I drive my Chevrolet with the P1B66 code?

While the vehicle may still be drivable, itâ€™s not recommended as it could lead to further damage to the hybrid/electric system or reduced efficiency.

5. How is the P1B66 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the battery circuit, check for wiring or connector issues, and test the battery control module for proper function.

6. What repairs can fix the P1B66 code?

Repairs may include replacing damaged wiring or connectors, repairing or replacing a faulty battery cell, or reprogramming/replacing the battery control module.

7. How much does it cost to fix the P1B66 code in a Chevrolet?

Repair costs vary but can range from $200 for simple wiring repairs to over $1,000 if the battery or control module needs replacement.

8. Does the P1B66 code mean my hybrid battery needs to be replaced?

Not necessarily. The issue may be isolated to one circuit or component, such as a wiring fault or a single cell, rather than the entire battery.

9. Can a software update fix the P1B66 code in a Chevrolet?

In some cases, a software update for the battery control module may resolve the issue if itâ€™s related to incorrect data processing.

10. What should I do if my Chevrolet shows the P1B66 code?

Have the vehicle inspected by a qualified technician as soon as possible to prevent further damage and ensure the hybrid/electric system operates correctly.