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P1649 2015 GMC Sierra Code - Immobilizer Security Code Not Programmed

Quick Answer

The P1649 code for a 2015 GMC Sierra indicates that the Immobilizer Security Code is not programmed correctly. Common causes include Faulty key fob, Malfunctioning immobilizer system, Issues with the vehicle's computer 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
P1649 2015 GMC Sierra indicates Immobilizer Security Code Not Programmed.
Common causes
Common causes include Faulty key fob, Malfunctioning immobilizer system, Issues with the vehicle's computer 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 15, 2024
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Code P1649 2015 GMC Sierra Description

The P1649 code for a 2015 GMC Sierra indicates that the Immobilizer Security Code is not programmed correctly. The immobilizer system is a security feature that prevents the vehicle from starting unless the correct key is used. When this code appears, it means that the security system is not recognizing the key, which can lead to the vehicle not starting or running properly. This issue can be caused by a variety of factors, such as a faulty key, a problem with the immobilizer system itself, or issues with the vehicle's computer system.

OBDII Code P1649 2015 GMC Sierra - Immobilizer Security Code Not Programmed
P1649 2015 GMC Sierra Code - Immobilizer Security Code Not Programmed

Common Causes of P1649 2015 GMC Sierra

  1. Faulty key fob
  2. Malfunctioning immobilizer system
  3. Issues with the vehicle's computer system
  4. Wiring or connection problems in the immobilizer system
  5. Low battery in the key fob

Symptoms of P1649 2015 GMC Sierra

  1. Engine cranks but does not start
  2. Security light on the dashboard stays illuminated
  3. Vehicle starts intermittently
  4. Loss of power while driving
  5. Inability to shift gears

How to Fix P1649 2015 GMC Sierra

  1. Check the key fob battery: Start by replacing the battery in the key fob to ensure it is not the cause of the issue.
  2. Reprogram the key: If the key fob is not the issue, the key may need to be reprogrammed to the vehicle's immobilizer system.
  3. Check the immobilizer system: Inspect the immobilizer system for any faults or malfunctions that may be preventing it from recognizing the key.
  4. Test the vehicle's computer system: Use a diagnostic tool to check for any error codes in the vehicle's computer system that may be related to the immobilizer security code.
  5. Consult a professional: If the issue persists after these steps, it is recommended to take the vehicle to a certified mechanic or dealership for further diagnosis and repair.

Cost to Fix P1649 2015 GMC Sierra

The cost of repairing the P1649 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of replacing a key fob battery is relatively low, typically ranging from $5 to $20. Reprogramming a key or diagnosing and repairing issues with the immobilizer system or vehicle's computer system can range from $100 to $500 or more, depending on the extent of the repairs needed. Labor costs can also vary, with hourly rates typically ranging from $80 to $150. It is advisable to contact local repair shops for a more accurate estimate based on the specific circumstances of the vehicle.

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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 GMC Sierra Code

1. What are the common symptoms of OBDII code P1649 on a 2015 GMC Sierra?

- Common symptoms include difficulty starting the vehicle, the engine not turning over, and the security light staying illuminated.

2. What does the OBDII code P1649 on a 2015 GMC Sierra indicate?

- The code P1649 typically indicates that the immobilizer security code is not programmed or recognized by the vehicle's system.

3. What are the possible causes of OBDII code P1649 on a 2015 GMC Sierra?

- The main causes can be a faulty immobilizer system, a key with a transponder chip issue, or an issue with the vehicle's computer system.

4. How can I diagnose the OBDII code P1649 on my 2015 GMC Sierra?

- To diagnose this code, it is recommended to use a diagnostic scanner to read the code, check the immobilizer system, test the transponder key, and inspect the vehicle's computer for any issues.

5. Can I repair the OBDII code P1649 on my 2015 GMC Sierra myself?

- Depending on the cause, you may be able to resolve the issue yourself by programming a new key, reprogramming the immobilizer system, or resetting the vehicle's computer. However, if unsure, it's best to consult a professional mechanic.

6. Is it safe to continue driving my 2015 GMC Sierra with OBDII code P1649?

- It is not recommended to drive the vehicle with this code as it can lead to potential starting issues or the vehicle not starting at all. It's best to address the problem promptly.

7. How much does it cost to fix OBDII code P1649 on a 2015 GMC Sierra?

- The cost of fixing this code can vary depending on the cause of the issue. It may range from a simple key reprogramming cost to a more complex immobilizer system repair cost.

8. Can a dealership help me with OBDII code P1649 on my 2015 GMC Sierra?

- Yes, a dealership or a qualified automotive locksmith specializing in immobilizer systems can assist in diagnosing and resolving the issue related to code P1649.

9. Will resetting the battery clear OBDII code P1649 on a 2015 GMC Sierra?

- Resetting the battery may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return. It is recommended to diagnose and fix the root cause.

10. How can I prevent OBDII code P1649 from appearing on my 2015 GMC Sierra in the future?

- To prevent code P1649, ensure your transponder key is in good condition, program new keys properly, and regularly maintain your vehicle's immobilizer system to avoid any future issues.

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