AutoCodes – Cadillac – P1B66 Cadillac

P1B66 Cadillac 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 Cadillac 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 885

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

What does this mean?

What are the Possible Causes of the DTC P1B66 Cadillac?

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

How to Fix the DTC P1B66 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code P1B66 in a Cadillac hybrid/electric vehicle?

- Common symptoms include reduced electric driving range, difficulty starting the vehicle, and potential illumination of the check engine light.

2. What are some possible causes of OBDII code P1B66 in a Cadillac hybrid/electric vehicle?

- The code P1B66 typically indicates a fault in the Hybrid/Electric Vehicle Battery 44 circuit, which could be caused by issues such as a faulty battery cell, wiring problems, or a malfunctioning battery management system.

3. Can I continue driving my Cadillac hybrid/electric vehicle with OBDII code P1B66 present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric system. It is best to have the issue diagnosed and repaired promptly.

4. How can I diagnose OBDII code P1B66 in my Cadillac hybrid/electric vehicle?

- Diagnosis of code P1B66 typically requires specialized diagnostic equipment that can communicate with the vehicle's hybrid/electric system. A professional technician with experience in hybrid/electric vehicles is recommended for accurate diagnosis.

5. Are there any common DIY repair tips for addressing OBDII code P1B66 in a Cadillac hybrid/electric vehicle?

- DIY repair of code P1B66 is not recommended due to the complexity of hybrid/electric vehicle systems. It is best to have the issue diagnosed and repaired by a qualified technician to ensure proper repair and safety.

6. How much does it cost to repair OBDII code P1B66 in a Cadillac hybrid/electric vehicle?

- Repair costs for OBDII code P1B66 can vary depending on the exact cause of the issue. It is advisable to obtain a diagnostic assessment from a professional technician to determine the specific repair needed and associated costs.

7. Can a faulty Hybrid/Electric Vehicle Battery 44 circuit cause other issues in a Cadillac hybrid/electric vehicle?

- Yes, a faulty Hybrid/Electric Vehicle Battery 44 circuit can cause a variety of issues in the vehicle, including reduced performance, decreased fuel efficiency, and potential safety concerns related to the hybrid/electric system.

8. How long does it typically take to repair OBDII code P1B66 in a Cadillac hybrid/electric vehicle?

- The repair time for OBDII code P1B66 can vary depending on the exact cause of the issue and the availability of parts. In some cases, repairs can be completed within a few hours, while more complex issues may take longer to address.

9. Are there any recalls or technical service bulletins related to OBDII code P1B66 in Cadillac hybrid/electric vehicles?

- It is advisable to check with a Cadillac dealership or authorized service center to inquire about any recalls or technical service bulletins related to OBDII code P1B66 in specific vehicle models.

10. Is it possible to prevent OBDII code P1B66 in a Cadillac hybrid/electric vehicle?

- While some issues leading to code P1B66 may be unavoidable, regular maintenance and timely inspections of the hybrid/electric system can help prevent potential faults. Ensuring proper care of the vehicle's battery and electrical components can also contribute to preventing code P1B66.