Engine-Codes.com
Engine-Codes – Generic – P0B91

P0B91 Code - Hybrid/Electric Vehicle Battery 18 Circuit Performance

Quick Answer

The diagnostic trouble code P0B91 indicates a problem with the Hybrid/Electric Vehicle Battery 18 Circuit Performance. Common causes include Faulty battery management system, Malfunctioning wiring or connectors, Defective battery cell. 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
P0B91 indicates Hybrid/Electric Vehicle Battery 18 Circuit Performance.
Common causes
Common causes include Faulty battery management system, Malfunctioning wiring or connectors, Defective battery cell.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0B91 Description

The diagnostic trouble code P0B91 indicates a problem with the Hybrid/Electric Vehicle Battery 18 Circuit Performance. In hybrid and electric vehicles, the battery plays a crucial role in powering the electric motor and supporting the internal combustion engine. The battery 18 circuit is responsible for managing the flow of electricity within the battery system. When this circuit is not performing as expected, it can lead to a variety of issues that affect the vehicle's overall performance.

OBDII Code P0B91 - Hybrid/Electric Vehicle Battery 18 Circuit Performance
P0B91 Code - Hybrid/Electric Vehicle Battery 18 Circuit Performance

Common Causes of P0B91

  1. Faulty battery management system
  2. Malfunctioning wiring or connectors
  3. Defective battery cell
  4. Issues with the battery control module
  5. Water damage or corrosion in the battery system

Symptoms of P0B91

  1. Illumination of the warning light on the dashboard
  2. Reduced acceleration and power
  3. Vehicle entering a reduced power mode
  4. Decreased fuel efficiency
  5. Difficulty starting the vehicle

How to Fix P0B91

  1. Perform a comprehensive diagnostic scan to retrieve the specific fault codes and pinpoint the issue.
  2. Inspect the battery system, wiring, and connectors for any visible damage or corrosion.
  3. Test the battery cells to identify any defective units that may be causing the problem.
  4. Replace any faulty components, such as the battery management system, wiring, connectors, or battery cell.
  5. Clear the fault codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0B91

The typical repair costs for addressing the Hybrid/Electric Vehicle Battery 18 Circuit Performance issue can range from $500 to $1500, depending on the extent of the damage and the parts that need to be replaced. This estimate includes the cost of parts and labor. It's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships. Independent shops often charge less, so it's advisable to check local rates for a more precise estimate.

Need more information about the P0B91 code?

Need more information on how to fix the P0B91 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0B91 code diagnosed by a professional: Find a repair shop in your area

Code P0B91 Information for Specific Makes

  • P0B91 Buick — Hybrid/Electric Vehicle Battery 18 Circuit Performance
  • P0B91 Cadillac — Hybrid/Electric Vehicle Battery 18 Circuit Performance
  • P0B91 Chevrolet — Hybrid/Electric Vehicle Battery 18 Circuit Performance
  • P0B91 GMC — Hybrid/Electric Vehicle Battery 18 Circuit Performance
  • P0B91 Saturn — Hybrid/Electric Vehicle Battery 18 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 P0B91 Code

No Frequently Asked Questions about P0B91 Code found.

Discuss the causes and fixes for P0B91 OBDII Code

Submit a New Comment

Code P0B91 comments

No comments found for this page.