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B1399 Mercury Code - Personalised Key Synchronisation System Programming Failure

Quick Answer

The B1399 diagnostic trouble code for Mercury vehicles indicates a Personalised Key Synchronisation System Programming Failure. Common causes include Faulty key fob programming, Weak or dead key fob battery, Malfunctioning keyless entry 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
B1399 Mercury indicates Personalised Key Synchronisation System Programming Failure.
Common causes
Common causes include Faulty key fob programming, Weak or dead key fob battery, Malfunctioning keyless entry 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 27, 2024
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Code B1399 Mercury Description

The B1399 diagnostic trouble code for Mercury vehicles indicates a Personalised Key Synchronisation System Programming Failure. This code typically relates to a problem with the vehicle's keyless entry system, specifically the synchronization between the key fob and the vehicle's security system. When this code is triggered, it means that the programming of the key fob has failed to synchronize with the vehicle's security system, leading to potential issues with unlocking and starting the vehicle.

OBDII Code B1399 Mercury - Personalised Key Synchronisation System Programming Failure
B1399 Mercury Code - Personalised Key Synchronisation System Programming Failure

Common Causes of B1399 Mercury

  1. Faulty key fob programming.
  2. Weak or dead key fob battery.
  3. Malfunctioning keyless entry module.
  4. Issues with the vehicle's security system.
  5. Interference from electronic devices affecting key fob signal transmission.

Symptoms of B1399 Mercury

  1. Inability to unlock or lock the vehicle using the key fob.
  2. Difficulty starting the vehicle with the keyless entry system.
  3. Warning lights related to the security system appearing on the dashboard.
  4. Intermittent issues with the keyless entry system functioning properly.

How to Fix B1399 Mercury

  1. Replace the key fob battery: Start by replacing the battery in the key fob to ensure it has sufficient power for synchronization.
  2. Reprogram the key fob: If the key fob programming is faulty, reprogramming it may resolve the synchronization issue.
  3. Check keyless entry module: Inspect the keyless entry module for any signs of damage or malfunction and replace if necessary.
  4. Diagnose security system: Conduct a thorough diagnosis of the vehicle's security system to identify any underlying issues affecting synchronization.
  5. Test synchronization: After performing repairs, test the synchronization between the key fob and the vehicle to ensure the issue is resolved.

Cost to Fix B1399 Mercury

The typical repair costs for addressing a Personalised Key Synchronisation System Programming Failure can vary depending on the specific cause of the issue. In general, replacing a key fob battery can cost between $5 and $20, while reprogramming a key fob may range from $50 to $100. If the keyless entry module needs to be replaced, the cost can be higher, typically ranging from $100 to $300. Diagnosing and repairing issues with the vehicle's security system may incur additional costs, with total repair expenses potentially exceeding $500.

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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 B1399 Mercury Code

1. What are the common symptoms of OBDII code B1399 in a Mercury related to the Personalised Key Synchronisation System Programming Failure?

- Common symptoms include issues with keyless entry system, difficulty starting the vehicle, and illuminated security warning lights on the dashboard.

2. What can cause the OBDII code B1399 in a Mercury indicating Personalised Key Synchronisation System Programming Failure?

- The code B1399 can be caused by a failed key fob, issues with the immobilizer system, faulty key transponder, or a problem with the vehicle's security module.

3. How can I diagnose the OBDII code B1399 in my Mercury for Personalised Key Synchronisation System Programming Failure?

- Diagnosis involves checking the key fob battery, examining the key transponder, scanning the vehicle for other related codes, and testing the communication between the key and the vehicle.

4. Are there any DIY repair tips for resolving the OBDII code B1399 in a Mercury due to Personalised Key Synchronisation System Programming Failure?

- DIY repair tips include checking and replacing the key fob battery, reprogramming the key fob, ensuring the key transponder is functioning properly, and resetting the vehicle's security system.

5. Can the OBDII code B1399 related to Personalised Key Synchronisation System Programming Failure be fixed without professional help?

- In some cases, simple troubleshooting steps like replacing the key fob battery or reprogramming the key fob can resolve the issue. However, if the problem persists, it's recommended to seek professional assistance.

6. How important is it to address the OBDII code B1399 in a Mercury indicating Personalised Key Synchronisation System Programming Failure?

- Ignoring the code B1399 can lead to potential issues with vehicle security, starting the car, and overall reliability. It's important to address this code promptly to ensure the proper functioning of the keyless entry system.

7. Can a malfunctioning key fob be the sole reason behind the OBDII code B1399 in a Mercury?

- While a faulty key fob can trigger the code B1399, it's essential to thoroughly diagnose the issue to rule out other potential causes like problems with the immobilizer system or key transponder.

8. Is it possible to reset the OBDII code B1399 related to Personalised Key Synchronisation System Programming Failure by disconnecting the car battery?

- Disconnecting the car battery may temporarily clear the code, but it's not a recommended solution as the underlying issue causing the code will likely persist. It's best to diagnose and address the root cause of the problem.

9. What role does the key transponder play in triggering the OBDII code B1399 in a Mercury for Personalised Key Synchronisation System Programming Failure?

- A malfunctioning key transponder can prevent the vehicle from recognizing the key, leading to the code B1399. Ensuring the key transponder is in good condition is crucial for proper synchronization with the vehicle's security system.

10. Are there any recalls or technical service bulletins related to the OBDII code B1399 in a Mercury associated with Personalised Key Synchronisation System Programming Failure?

- It's recommended to check with the manufacturer or authorized dealerships for any recalls or technical service bulletins specifically addressing the OBDII code B1399 in Mercury vehicles related to the Personalised Key Synchronisation System Programming Failure.

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