AutoCodes – Generic – B2191

B2191 Code - Difference Of Key

Quick Answer

The ID verification is performed through the Body Control Module (BCM) and the Nissan Anti Theft System (NATS) Intelligent Key when the push-button ignition switch is pressed. Common causes include Intelligent Key registration, Faulty Intelligent Key. 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: B2191 indicates Difference Of Key.
Common causes: Common causes include Intelligent Key registration, Faulty Intelligent Key.
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 1,018

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 Sep 26, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2191 Description

The ID verification is performed through the Body Control Module (BCM) and the Nissan Anti Theft System (NATS) Intelligent Key when the push-button ignition switch is pressed. The BCM prohibits the release of steering lock or start of engine when an unregistered ID of the NATS Intelligent Key is used. The OBDII code is set when the ID verification results between BCM and Intelligent Key are negative. The registration is necessary.

OBDII Code B2191 - Difference Of Key - AutoCodes.com — B2191 Code - Difference Of Key

What does this mean?

What are the Possible Causes of the DTC B2191?

Intelligent Key registration
Faulty Intelligent Key

How to Fix the DTC B2191?

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 B2191 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.

Need more information about the B2191 code?

Need more information on how to fix the B2191 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2191 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2191 Infiniti — Difference Of Key
B2191 Nissan — Difference Of Key

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 B2191 Code

1. What does OBDII code B2191 "Difference Of Key" indicate?

The B2191 code suggests a discrepancy between the key identification codes stored in different modules of the vehicle.

2. What are the common symptoms of OBDII code B2191?

Common symptoms of code B2191 may include issues with starting the vehicle, intermittent stalling, or the engine not turning over.

3. What are the possible causes of OBDII code B2191?

Possible causes of code B2191 include a faulty key fob, issues with the key transponder, or a communication error between the key and the vehicle's modules.

4. How can I diagnose OBDII code B2191?

Diagnosing code B2191 typically involves using a scan tool to retrieve the code, checking the key fob's functionality, and inspecting the key transponder for any damage.

5. Can I still drive my vehicle with OBDII code B2191 present?

It is not recommended to drive the vehicle with an active B2191 code, as it may lead to starting issues or potential stalling while driving.

6. How can I repair OBDII code B2191?

To repair code B2191, you may need to reprogram the key fob, replace the key transponder, or reset the key identification codes in the vehicle's modules.

7. Are there any DIY fixes for OBDII code B2191?

DIY fixes for code B2191 are limited, as resolving the key identification issue often requires specialized tools and expertise available at a professional automotive service center.

8. How much does it cost to fix OBDII code B2191?

The cost of fixing code B2191 can vary depending on the underlying cause, but it may involve expenses for key reprogramming, transponder replacement, or module reconfiguration.

9. Can a locksmith help with OBDII code B2191?

Locksmiths with automotive expertise may be able to assist with key-related issues causing code B2191, such as reprogramming or replacing key transponders.

10. How long does it take to repair OBDII code B2191?

The repair time for code B2191 can vary based on the diagnostic process and the specific fix required, but it typically takes a few hours to a day to address the key-related issue causing the code.