AutoCodes – GMC – P1B89 GMC

P1B89 GMC 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 GMC 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 744

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

What does this mean?

What are the Possible Causes of the DTC P1B89 GMC?

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

How to Fix the DTC P1B89 GMC?

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 GMC 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 GMC Code

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

The common symptoms of code P1B89 include reduced vehicle performance, check engine light illuminated, and potential issues with the hybrid/electric vehicle battery.

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

The code P1B89 is typically caused by a high voltage condition in the Hybrid/Electric Vehicle Battery 55 Circuit. This can be due to wiring issues, a faulty sensor, or a problem with the battery itself.

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

Code P1B89 should be addressed promptly as it can affect the performance and safety of the vehicle. Continuing to drive with this code present may lead to further damage to the hybrid/electric system.

4. How can I diagnose the OBDII code P1B89 in my GMC Hybrid/Electric Vehicle?

Diagnosing code P1B89 typically involves using a scan tool to retrieve the code, inspecting the battery connections and wiring, and testing the voltage levels in the Hybrid/Electric Vehicle Battery 55 Circuit.

5. Can I still drive my GMC Hybrid/Electric Vehicle with the OBDII code P1B89 present?

It is not recommended to drive your vehicle with the code P1B89 present, as it can lead to potential safety hazards and further damage to the hybrid/electric system. It's best to have the issue diagnosed and repaired as soon as possible.

6. What are some common repair tips for fixing OBDII code P1B89 in a GMC Hybrid/Electric Vehicle?

Common repair tips for resolving code P1B89 include checking and securing battery connections, inspecting wiring for damage or corrosion, and ensuring the battery voltage levels are within the manufacturer's specifications.

7. How much does it typically cost to repair OBDII code P1B89 in a GMC Hybrid/Electric Vehicle?

The cost of repairing code P1B89 can vary depending on the underlying cause of the issue. It's best to consult with a professional mechanic or dealership for an accurate diagnosis and cost estimate.

8. Can a DIY enthusiast fix the OBDII code P1B89 in a GMC Hybrid/Electric Vehicle?

While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing code P1B89 in a GMC Hybrid/Electric Vehicle often requires specialized tools and knowledge. It's recommended to seek professional assistance for this issue.

9. Are there any recalls or technical service bulletins related to OBDII code P1B89 in GMC Hybrid/Electric Vehicles?

It's advisable to check with GMC or a dealership for any recalls or technical service bulletins related to code P1B89 in your specific model of Hybrid/Electric Vehicle. Manufacturers may provide assistance or coverage for certain related issues.

10. How can I prevent OBDII code P1B89 from occurring in my GMC Hybrid/Electric Vehicle?

Regular maintenance and inspections of the hybrid/electric system, including the battery and related components, can help prevent code P1B89 from occurring. Following the manufacturer's recommended service schedule is crucial in maintaining the health of your vehicle's electrical system.