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B1602 Mercury Code - PATS Received Invalid Format Of Key-Code From Ignition Key Transponder

Quick Answer

The B1602 diagnostic trouble code for Mercury vehicles indicates that the Passive Anti-Theft System (PATS) has received an invalid format of the key-code from the ignition key transponder. Common causes include Faulty key transponder, Wiring issues between key transponder and PATS module, Malfunctioning PATS 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
B1602 Mercury indicates PATS Received Invalid Format Of Key-Code From Ignition Key Transponder.
Common causes
Common causes include Faulty key transponder, Wiring issues between key transponder and PATS module, Malfunctioning PATS 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 10, 2024
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Code B1602 Mercury Description

The B1602 diagnostic trouble code for Mercury vehicles indicates that the Passive Anti-Theft System (PATS) has received an invalid format of the key-code from the ignition key transponder. The PATS is a security feature designed to prevent unauthorized starting of the vehicle. When the key is inserted into the ignition, the transponder sends a signal to the PATS module. If the key-code format is incorrect or not recognized by the system, the PATS will disable the vehicle's engine from starting.

OBDII Code B1602 Mercury - PATS Received Invalid Format Of Key-Code From Ignition Key Transponder
B1602 Mercury Code - PATS Received Invalid Format Of Key-Code From Ignition Key Transponder

Common Causes of B1602 Mercury

  1. Faulty key transponder
  2. Wiring issues between key transponder and PATS module
  3. Malfunctioning PATS module
  4. Dead or low battery in the key fob
  5. Incorrectly programmed key

Symptoms of B1602 Mercury

  1. Engine cranks but does not start
  2. PATS light flashing on the dashboard
  3. Inability to turn the ignition key
  4. Vehicle entering anti-theft mode and not starting

How to Fix B1602 Mercury

  1. Check the key fob battery: Start by replacing the battery in the key fob to ensure it is not the cause of the communication error.
  2. Verify key programming: Make sure the key is correctly programmed to the vehicle. Re-programming the key may resolve the issue.
  3. Inspect wiring: Check for any damaged or loose wiring between the key transponder and the PATS module. Repair or replace as needed.
  4. Test key transponder: Test the key transponder to ensure it is sending the correct signal to the PATS module. Replace if faulty.
  5. Replace PATS module: If all other potential causes have been ruled out, replacing the PATS module may be necessary to fix the issue.

Cost to Fix B1602 Mercury

The cost of repairing a B1602 code on a Mercury vehicle can vary depending on the specific cause of the issue. On average, the parts required for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost may fall between $150 and $500. Keep in mind that these estimates are approximate and actual costs may differ based on various factors. It is advisable to consult with a professional mechanic or auto repair shop for a more accurate assessment of repair costs.

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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 B1602 Mercury Code

1. What are the common symptoms of OBDII code B1602 in Mercury vehicles?

The common symptoms include the engine not starting, the vehicle going into anti-theft mode, and the security light flashing or staying on.

2. What does the OBDII code B1602 in Mercury vehicles indicate?

The code B1602 indicates that the Passive Anti-Theft System (PATS) has received an invalid format of key-code from the ignition key transponder.

3. What are some possible causes of OBDII code B1602 in a Mercury vehicle?

Possible causes include a faulty ignition key transponder, issues with the PATS module, wiring problems, or a malfunctioning PCM (Powertrain Control Module).

4. How can I diagnose OBDII code B1602 in my Mercury vehicle?

Diagnosis typically involves checking the ignition key transponder, inspecting the wiring for any damage, and using a diagnostic scanner to read the fault codes stored in the PCM.

5. How can I repair OBDII code B1602 in my Mercury vehicle?

Repair options may include reprogramming the ignition key transponder, repairing or replacing damaged wiring, resetting the PATS system, or replacing the PATS module if necessary.

6. Can I drive my Mercury vehicle with OBDII code B1602?

It is not recommended to drive the vehicle with code B1602 unresolved, as it may lead to starting issues or the vehicle going into anti-theft mode while driving.

7. How much does it typically cost to repair OBDII code B1602 in a Mercury vehicle?

The cost of repair can vary depending on the underlying cause. It is recommended to get a diagnostic assessment from a qualified mechanic to determine the exact repair cost.

8. Is OBDII code B1602 a common issue in Mercury vehicles?

OBDII code B1602 related to PATS issues is relatively common in Mercury vehicles, especially in models equipped with anti-theft systems.

9. Can I reset OBDII code B1602 in my Mercury vehicle without professional help?

In some cases, you may be able to reset the code by disconnecting the battery for a few minutes. However, it is recommended to address the underlying issue to prevent the code from reappearing.

10. How can I prevent OBDII code B1602 from occurring in my Mercury vehicle?

To prevent code B1602, ensure your ignition key transponder is in good condition, avoid damage to the wiring, and follow proper maintenance practices for your vehicle's anti-theft system.

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