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Engine-Codes – Generic – B1601

B1601 Code - PATS Received Incorrect Key-Code From Ignition Key Transponder

Quick Answer

The B1601 diagnostic trouble code (DTC) indicates that the Passive Anti-Theft System (PATS) has received an incorrect key-code from the ignition key transponder. Common causes include Faulty ignition key transponder, Wiring issues between the transponder and the PATS module, PATS module malfunction. 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
B1601 indicates PATS Received Incorrect Key-Code From Ignition Key Transponder.
Common causes
Common causes include Faulty ignition key transponder, Wiring issues between the transponder and the PATS module, PATS module malfunction.
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 Aug 19, 2024
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Code B1601 Description

The B1601 diagnostic trouble code (DTC) indicates that the Passive Anti-Theft System (PATS) has received an incorrect key-code from the ignition key transponder. PATS is a security feature in many modern vehicles that prevents the engine from starting without the correct key. When the system detects that the key-code does not match what is expected, it will trigger this code and prevent the engine from starting. This code can affect the vehicle's performance by rendering it inoperable until the issue is resolved.

OBDII Code B1601 - PATS Received Incorrect Key-Code From Ignition Key Transponder
B1601 Code - PATS Received Incorrect Key-Code From Ignition Key Transponder

Common Causes of B1601

  1. Faulty ignition key transponder
  2. Wiring issues between the transponder and the PATS module
  3. PATS module malfunction
  4. Faulty key cylinder
  5. Low battery in the key fob

Symptoms of B1601

  1. Engine cranks but does not start
  2. Immobilizer light flashing on the dashboard
  3. Inability to start the vehicle with the correct key
  4. Engine starting and then immediately cutting off

How to Fix B1601

  1. Check the battery in the key fob and replace if necessary.
  2. Inspect the wiring between the transponder and the PATS module for any breaks or damage.
  3. Replace the ignition key transponder if it is faulty.
  4. Reset the PATS system using a compatible diagnostic tool.
  5. If the issue persists, consider replacing the PATS module.

Cost to Fix B1601

The cost of repairing a B1601 code can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of replacing a faulty key transponder can range from $50 to $200, while replacing the PATS module can cost anywhere from $100 to $500. Additionally, diagnostic time and labor rates at auto repair shops can impact the overall cost. It's recommended to consult with a professional mechanic to get an accurate estimate for your specific situation.

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Code B1601 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 B1601 Code

1. What are common symptoms of OBDII code B1601 (PATS Received Incorrect Key-Code From Ignition Key Transponder)?

- Common symptoms include difficulty starting the vehicle, engine stalling, and the security light on the dashboard flashing.

2. What are the possible causes of OBDII code B1601?

- The code B1601 can be triggered by issues with the ignition key transponder, a faulty PATS (Passive Anti-Theft System) module, or a problem with the vehicle's immobilizer system.

3. How can I diagnose the cause of OBDII code B1601?

- Diagnosis typically involves checking the key transponder for proper communication, inspecting the PATS module for any faults, and performing a system reset to see if the code reappears.

4. Can I still drive my vehicle with OBDII code B1601 present?

- It is not recommended to drive the vehicle with code B1601 as it may lead to potential starting or stalling issues, and the vehicle's security system may be compromised.

5. How can I repair OBDII code B1601?

- Repairing code B1601 may involve reprogramming the key transponder, replacing the PATS module, or troubleshooting and repairing any faults in the immobilizer system.

6. Are there any DIY tips for addressing OBDII code B1601?

- DIY tips may include checking the key fob battery, ensuring the key transponder is clean and undamaged, and verifying that the key is programmed correctly to the vehicle.

7. Is OBDII code B1601 a serious issue?

- OBDII code B1601 should be addressed promptly as it can lead to potential starting and security system problems, affecting the drivability and security of the vehicle.

8. How much does it cost to repair OBDII code B1601?

- The cost of repairing OBDII code B1601 can vary depending on the underlying cause, but it may involve expenses for parts and labor at a repair shop or dealership.

9. Can OBDII code B1601 be fixed without professional help?

- While some DIY troubleshooting can be attempted, resolving OBDII code B1601 may require specialized tools and knowledge, making professional assistance advisable.

10. How can I prevent OBDII code B1601 from occurring again?

- To prevent the recurrence of OBDII code B1601, it is important to maintain the key transponder, ensure proper key programming, and address any issues with the vehicle's security system promptly.

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