AutoCodes – Generic – P1B89

P1B89 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 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 865

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

What does this mean?

What are the Possible Causes of the DTC P1B89?

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

How to Fix the DTC P1B89?

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 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?

Get the P1B89 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B89 Buick — Hybrid/Electric Vehicle Battery 55 Circuit High Voltage
P1B89 Cadillac — Hybrid/Electric Vehicle Battery 55 Circuit High Voltage
P1B89 Chevrolet — Hybrid/Electric Vehicle Battery 55 Circuit High Voltage
P1B89 GMC — Hybrid/Electric Vehicle Battery 55 Circuit High Voltage
P1B89 Saturn — Hybrid/Electric Vehicle Battery 55 Circuit High Voltage

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 Code

1. What are common symptoms of OBDII code P1B89 (Hybrid/Electric Vehicle Battery 55 Circuit High Voltage)?

- Common symptoms include the hybrid/electric vehicle not starting, reduced fuel efficiency, and warning lights on the dashboard related to the high voltage system.

2. What are the possible causes of OBDII code P1B89?

- The code P1B89 can be caused by issues such as a faulty high voltage battery pack, damaged wiring in the battery circuit, or a malfunctioning battery control module.

3. How can I diagnose the OBDII code P1B89 at home?

- You can diagnose the code P1B89 by using an OBDII scanner to read the code and check the high voltage battery system for any visible damage or loose connections. However, for a comprehensive diagnosis, it's recommended to visit a professional mechanic.

4. Can I still drive my hybrid/electric vehicle with the OBDII code P1B89 present?

- It is not recommended to drive the vehicle with the code P1B89 present, as it indicates a potential high voltage system issue that can be dangerous. Have the vehicle inspected and repaired as soon as possible.

5. How can I fix OBDII code P1B89 (Hybrid/Electric Vehicle Battery 55 Circuit High Voltage)?

- Repairing the code P1B89 typically involves diagnosing the specific cause of the issue, which may require replacing the high voltage battery pack, repairing damaged wiring, or reprogramming the battery control module.

6. Is it safe to attempt repairs on the high voltage system related to code P1B89 myself?

- Working on the high voltage system of a hybrid/electric vehicle can be extremely dangerous and should only be done by trained professionals with the proper equipment and knowledge. It is not recommended for DIY repairs.

7. How much does it cost to repair OBDII code P1B89?

- The cost of repairing code P1B89 can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates in your area. It's best to get a diagnostic and repair estimate from a qualified mechanic.

8. Can a low or dead auxiliary battery trigger OBDII code P1B89?

- While a low or dead auxiliary battery can cause issues with starting the vehicle, it is unlikely to directly trigger code P1B89. However, it's still important to ensure all batteries in the vehicle are in good condition.

9. Will resetting the OBDII code P1B89 make it go away permanently?

- Resetting the code P1B89 may temporarily turn off the warning light, but if the underlying issue causing the code is not addressed, it is likely to return. It's crucial to diagnose and fix the root cause of the problem.

10. Can extreme weather conditions affect the occurrence of OBDII code P1B89?

- Extreme weather conditions, such as extreme heat or cold, can potentially affect the performance of the high voltage system in a hybrid/electric vehicle, which may contribute to triggering code P1B89. Regular maintenance and monitoring are important in such conditions.