AutoCodes – Cadillac – P1B89 Cadillac

P1B89 Cadillac Code - Hybrid/Electric Vehicle Battery 55 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: P1B89 Cadillac indicates Hybrid/Electric Vehicle Battery 55 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 845

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 P1B89 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 P1B89 Cadillac - Hybrid/Electric Vehicle Battery 55 Circuit High Voltage - AutoCodes.com — P1B89 Cadillac Code - Hybrid/Electric Vehicle Battery 55 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B89 Cadillac?

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

How to Fix the DTC P1B89 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 P1B89 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 P1B89 Cadillac Code

1. What are common symptoms of OBDII code P1B89 in a Cadillac Hybrid/Electric Vehicle?

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

2. What can cause the OBDII code P1B89 to trigger in a Cadillac Hybrid/Electric Vehicle?

- The code P1B89 is typically triggered by high voltage detected in the Hybrid/Electric Vehicle Battery 55 circuit.

3. How serious is the OBDII code P1B89 in a Cadillac Hybrid/Electric Vehicle?

- The code P1B89 is considered a serious issue as it can affect the performance and efficiency of the hybrid/electric vehicle.

4. What should I do if my Cadillac Hybrid/Electric Vehicle shows the OBDII code P1B89?

- It is recommended to have the vehicle inspected by a qualified technician to diagnose the exact cause and determine the necessary repairs.

5. Can I continue driving my Cadillac with the OBDII code P1B89 present?

- It is not recommended to drive the vehicle with the code P1B89 present as it can lead to further damage to the hybrid/electric system.

6. How can I repair the OBDII code P1B89 in my Cadillac Hybrid/Electric Vehicle?

- Repairing the code P1B89 may involve checking and repairing the Hybrid/Electric Vehicle Battery 55 circuit for any faults or damages.

7. Is it possible to reset the OBDII code P1B89 in a Cadillac Hybrid/Electric Vehicle?

- While it is possible to clear the code temporarily, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Are there any specific maintenance tips to prevent the OBDII code P1B89 in a Cadillac Hybrid/Electric Vehicle?

- Regularly inspecting the hybrid/electric system components and following the manufacturer's maintenance schedule can help prevent issues like code P1B89.

9. How long does it take to repair the OBDII code P1B89 in a Cadillac Hybrid/Electric Vehicle?

- The repair time for the code P1B89 can vary depending on the exact cause and extent of the issue, so it is best to consult with a professional technician for an accurate estimate.

10. Can the OBDII code P1B89 affect the safety of driving a Cadillac Hybrid/Electric Vehicle?

- Yes, the code P1B89 can potentially affect the safety of driving a hybrid/electric vehicle, especially if it leads to performance issues or power loss while driving.