AutoCodes – Generic – P1B66

P1B66 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 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 4,202

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

What does this mean?

What are the Possible Causes of the DTC P1B66?

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

How to Fix the DTC P1B66?

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 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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Need Help with the Code?

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Information for Specific Makes

P1B66 Buick — Hybrid/Electric Vehicle Battery 44 Circuit Performance
P1B66 Cadillac — Hybrid/Electric Vehicle Battery 44 Circuit Performance
P1B66 Chevrolet — Hybrid/Electric Vehicle Battery 44 Circuit Performance
P1B66 GMC — Hybrid/Electric Vehicle Battery 44 Circuit Performance
P1B66 Saturn — Hybrid/Electric Vehicle Battery 44 Circuit Performance

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 Code

1. What are the common symptoms of OBDII code P1B66 (Hybrid/Electric Vehicle Battery 44 Circuit Performance)?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential warning lights on the dashboard.

2. What are possible causes of OBDII code P1B66?

- Possible causes can include issues with the hybrid/electric vehicle battery, faulty battery sensors, wiring problems, or software glitches in the vehicle's control system.

3. How can I diagnose the source of OBDII code P1B66?

- Diagnosing the issue may require using a professional OBDII scanner to read the code and perform further testing on the hybrid/electric vehicle battery, sensors, and related components.

4. Can I continue driving my vehicle with OBDII code P1B66?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid system and decrease overall vehicle performance.

5. What are some repair tips for addressing OBDII code P1B66?

- Repair tips may include checking and cleaning battery terminals, inspecting wiring connections, ensuring proper battery fluid levels, and updating software if necessary.

6. How much does it typically cost to repair OBDII code P1B66?

- The cost of repairs can vary depending on the specific cause of 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.

7. Is it safe to attempt DIY repairs for OBDII code P1B66?

- Due to the complex nature of hybrid/electric vehicle systems, it is generally recommended to seek professional help for diagnosing and repairing OBDII code P1B66 to ensure safety and proper functionality.

8. Can extreme weather conditions trigger OBDII code P1B66?

- Extreme weather conditions, such as extreme heat or cold, can potentially impact the performance of hybrid/electric vehicle batteries and sensors, leading to the triggering of OBDII code P1B66.

9. How often should I check the hybrid/electric vehicle battery for issues related to OBDII code P1B66?

- It is recommended to have the hybrid/electric vehicle battery and related components inspected regularly as part of routine maintenance to prevent issues like OBDII code P1B66 from occurring.

10. Are there any recalls or technical service bulletins related to OBDII code P1B66?

- It is advisable to check with the vehicle manufacturer or authorized service centers for any recalls or technical service bulletins related to OBDII code P1B66 to address the issue effectively.