AutoCodes – Nissan – B2191 Nissan

B2191 Nissan 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 Nissan 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 21,089

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

What does this mean?

What are the Possible Causes of the DTC B2191 Nissan?

Intelligent Key registration
Faulty Intelligent Key

How to Fix the DTC B2191 Nissan?

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 Nissan 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 B2191 Nissan Code

What does the OBDII code B2191 on a Nissan indicate?

The code B2191 in Nissan vehicles suggests a "Difference of Key," indicating that the key being used does not match the vehicle's programmed key data.

What are common symptoms of the B2191 code in a Nissan?

Common symptoms include the engine not starting, the security light flashing on the dashboard, and sometimes the vehicle might start and then stall shortly after.

What causes the B2191 code to appear in a Nissan?

This code is typically triggered when there is a mismatch between the key being used and the vehicle's immobilizer settings. This could be due to using a non-programmed key, damaged key, faulty immobilizer control unit, or issues with the vehicle's electronic control module (ECM).

How can I fix the B2191 code in my Nissan?

To fix this issue, you should first check and ensure you are using the correct programmed key. If the key is correct, it may need reprogramming. If reprogramming does not work, inspect the immobilizer system and ECM for faults and repair or replace as necessary.

Can the B2191 code affect the drivability of my Nissan?

Yes, if the B2191 code is active, your Nissan may not start or might stall shortly after starting, which definitely affects the vehicle's drivability.

Is it safe to drive a Nissan with the B2191 code active?

It is generally not advisable to drive with this code active as the vehicle may stall unexpectedly or may not start at all, which could potentially leave you stranded.

What tools are needed to diagnose and address the B2191 code in a Nissan?

Diagnosing and fixing the B2191 code typically requires an OBDII scanner that is capable of interfacing with the vehicleâ€™s immobilizer system, as well as possibly a key programmer if a new key needs programming.

How urgent is it to address the B2191 code in a Nissan?

It is quite urgent to address this issue, as it involves the vehicleâ€™s security system and can prevent the engine from starting or cause it to stall unexpectedly.

Could using a duplicate key cause the B2191 code to appear in a Nissan?

Yes, using a duplicate or non-original key that hasnâ€™t been properly programmed to match the vehicleâ€™s immobilizer settings can trigger this code.