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P1649 2015 Chevrolet Silverado Code - Immobilizer Security Code Not Programmed

Quick Answer

The P1649 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates that the immobilizer security code has not been programmed or is not recognized by the vehicle's system. Common causes include Incorrectly programmed key fob, Faulty immobilizer system, Malfunctioning vehicle computer. 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
P1649 2015 Chevrolet Silverado indicates Immobilizer Security Code Not Programmed.
Common causes
Common causes include Incorrectly programmed key fob, Faulty immobilizer system, Malfunctioning vehicle computer.
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 13, 2024
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Code P1649 2015 Chevrolet Silverado Description

The P1649 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates that the immobilizer security code has not been programmed or is not recognized by the vehicle's system. The immobilizer is a security feature that prevents the engine from starting unless the correct key or key fob is used. When this code appears, it means that the vehicle's computer is not receiving the proper signal from the immobilizer, which can lead to starting issues or even prevent the engine from starting altogether.

OBDII Code P1649 2015 Chevrolet Silverado - Immobilizer Security Code Not Programmed
P1649 2015 Chevrolet Silverado Code - Immobilizer Security Code Not Programmed

Common Causes of P1649 2015 Chevrolet Silverado

  1. Incorrectly programmed key fob
  2. Faulty immobilizer system
  3. Malfunctioning vehicle computer
  4. Wiring issues between the immobilizer and the computer

Symptoms of P1649 2015 Chevrolet Silverado

  1. Engine cranks but does not start
  2. Engine starts but immediately shuts off
  3. Security light on the dashboard stays illuminated
  4. Inability to turn the ignition key

How to Fix P1649 2015 Chevrolet Silverado

  1. Verify the immobilizer security code: The first step in resolving this issue is to verify that the correct security code is programmed into the vehicle's system.
  2. Reprogram the key fob: If the key fob is not programmed correctly, it may need to be reprogrammed to communicate with the immobilizer system.
  3. Check the immobilizer system: Inspect the immobilizer system for any faults or malfunctions that may be preventing it from communicating with the vehicle's computer.
  4. Scan for other DTCs: It is important to scan for any other diagnostic trouble codes that may be related to the immobilizer system to ensure a comprehensive repair.
  5. Clear the code: Once the issue has been resolved, clear the P1649 code from the vehicle's computer to reset the system.

Cost to Fix P1649 2015 Chevrolet Silverado

The cost of repairing the P1649 code on a 2015 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the cost of reprogramming a key fob or addressing wiring issues may range from $100 to $300. If the immobilizer system or vehicle computer needs to be replaced, the cost can increase significantly, potentially ranging from $500 to $1500 or more. It is advisable to consult with a qualified mechanic or dealership to get an accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates can vary, so it is recommended to inquire about rates in your local area for a more precise estimate.

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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 P1649 2015 Chevrolet Silverado Code

1. What does the OBDII code P1649 on a 2015 Chevrolet Silverado mean?

The code P1649 indicates that the Immobilizer Security Code is not programmed in the vehicle's system.

2. What are the common symptoms of the Immobilizer Security Code Not Programmed issue in a 2015 Chevrolet Silverado?

Common symptoms include the engine not starting, the vehicle not recognizing the key, and a flashing security light on the dashboard.

3. What are the possible causes of the Immobilizer Security Code Not Programmed error in a 2015 Chevrolet Silverado?

Possible causes include a faulty key fob, a problem with the vehicle's immobilizer system, or issues with the key programming.

4. How can I diagnose the Immobilizer Security Code Not Programmed problem in my 2015 Chevrolet Silverado?

Diagnosing the issue may require using a professional OBDII scanner to retrieve the specific error code and checking the key fob's functionality.

5. Is it safe to continue driving my 2015 Chevrolet Silverado with the Immobilizer Security Code Not Programmed error code?

It is not recommended to drive the vehicle with this error code, as it may lead to starting issues and potential security concerns.

6. Can I reset the Immobilizer Security Code Not Programmed code on my 2015 Chevrolet Silverado myself?

Resetting the code may require reprogramming the key fob or addressing the underlying cause, which may be best done by a professional mechanic.

7. How much does it typically cost to repair the Immobilizer Security Code Not Programmed issue in a 2015 Chevrolet Silverado?

The repair cost can vary depending on the exact cause of the issue, but it may involve reprogramming the key fob or repairing the immobilizer system, which can range from moderate to expensive.

8. Are there any DIY tips for troubleshooting the Immobilizer Security Code Not Programmed issue in my 2015 Chevrolet Silverado?

DIY tips may include checking the key fob battery, ensuring the key is properly programmed, and inspecting for any visible damage to the immobilizer system components.

9. Will resetting the vehicle's computer clear the Immobilizer Security Code Not Programmed error code?

Resetting the vehicle's computer may clear the code temporarily, but if the underlying issue is not addressed, the code is likely to reappear.

10. How long does it take to repair the Immobilizer Security Code Not Programmed problem in a 2015 Chevrolet Silverado?

The repair time can vary depending on the cause of the issue and the availability of parts, but it may range from a quick fix to a more involved repair that could take several hours to complete.

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