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Engine-Codes – Generic – B2191

B2191 Code - Difference Of Key

Quick Answer

The B2191 code indicates a "Difference Of Key" issue in the vehicle's system. Common causes include Defective key, Faulty key transponder, Programming issue with the immobilizer system. 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 Defective key, Faulty key transponder, Programming issue with the immobilizer system.
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 08, 2024
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Code B2191 Description

The B2191 code indicates a "Difference Of Key" issue in the vehicle's system. This code typically points to a problem with the key or the key transponder in vehicles equipped with an immobilizer system. The immobilizer system is designed to prevent the vehicle from being started without the correct key, which has a unique electronic code that the system recognizes.

OBDII Code B2191 - Difference Of Key
B2191 Code - Difference Of Key

Common Causes of B2191

  1. Defective key
  2. Faulty key transponder
  3. Programming issue with the immobilizer system
  4. Wiring or connection issue between the key transponder and immobilizer system
  5. Faulty immobilizer system components

Symptoms of B2191

  1. Vehicle not starting
  2. Engine starting and then immediately shutting off
  3. Security light flashing on the dashboard
  4. Key not being recognized by the immobilizer system
  5. Immobilizer warning message displayed on the instrument cluster

How to Fix B2191

  1. Check the key for any visible damage and test it with a diagnostic tool to ensure it is transmitting the correct code.
  2. Test the key transponder to determine if it is functioning properly.
  3. Inspect the wiring and connections between the key transponder and immobilizer system for any issues.
  4. Scan the vehicle's immobilizer system for error codes and reset or reprogram as needed.
  5. Replace the key, key transponder, or any faulty immobilizer system components if necessary.

Cost to Fix B2191

The cost of repairing a Difference Of Key issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of replacing a key or key transponder can range from $50 to $200, while repairing or reprogramming the immobilizer system can cost between $100 and $500. Labor costs for diagnosis and repair can add an additional $100 to $300 to the total bill. It's important to note that these are rough estimates, and actual costs may vary based on the vehicle make and model, the location of the repair shop, and the extent of the repairs required. It's recommended to consult with a qualified technician for a more accurate cost estimate.

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Code B2191 Information for Specific Makes

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.

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