AutoCodes – GMC – P1649 2014 GMC Sierra

P1649 2014 GMC Sierra Code - Immobilizer Security Code Not Programmed

Quick Answer

When learning the security code, as well as the challenge and response sequence, the Engine Control Module (ECM) is placed in learn mode. Common causes include Perform Engine Control Module Immobilizer Learn Procedure, Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted. 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 2014 GMC Sierra indicates Immobilizer Security Code Not Programmed.
Common causes: Common causes include Perform Engine Control Module Immobilizer Learn Procedure, Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted.
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.

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Code Popularity 271

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 17, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1649 2014 GMC Sierra Description

When learning the security code, as well as the challenge and response sequence, the Engine Control Module (ECM) is placed in learn mode. Once the security code and challenge/response are learned, learn mode will be exited when the engine is successfully started. The Diagnostic Trouble Code (DTC) will be set when the ECM has not learned a security code.

OBDII Code P1649 2014 GMC Sierra - Immobilizer Security Code Not Programmed - AutoCodes.com — P1649 2014 GMC Sierra Code - Immobilizer Security Code Not Programmed

What does this mean?

What are the Possible Causes of the DTC P1649 2014 GMC Sierra?

Perform Engine Control Module Immobilizer Learn Procedure
Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC P1649 2014 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1649 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1649 2014 GMC Sierra code?

Need more information on how to fix the P1649 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2014 GMC Sierra Code

1. What does the OBDII code P1649 mean on a 2014 GMC Sierra?

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

2. What are the symptoms of the P1649 code on a 2014 GMC Sierra?

Common symptoms include the engine not starting, the security light illuminating on the dashboard, and possible trouble with the key fob or ignition system.

3. What causes the P1649 code on a 2014 GMC Sierra?

The primary causes include a key that hasnâ€™t been programmed to the vehicle, a malfunctioning immobilizer, or an issue with the vehicle's anti-theft system.

4. How can I fix the P1649 code on my 2014 GMC Sierra?

You may need to reprogram the key using a professional scan tool or visit a dealership to ensure the immobilizer system is synced with the vehicle's ECU.

5. Can a dead or weak key fob battery trigger the P1649 code?

No, a weak key fob battery typically wonâ€™t cause this code, but it may prevent the key from being recognized, which could be mistaken for an immobilizer issue.

6. Do I need a new key to fix the P1649 code on my GMC Sierra?

Not necessarily. If the key is undamaged, it may just need to be reprogrammed to the immobilizer system.

7. Can replacing the battery in my 2014 GMC Sierra cause the P1649 code to appear?

Yes, disconnecting the battery can sometimes reset the immobilizer system, requiring the key to be reprogrammed.

8. Is clearing the P1649 code with an OBDII scanner enough to fix the issue?

No, simply clearing the code will not resolve the underlying issue. The immobilizer system must be properly programmed or repaired.

9. How much does it cost to fix the P1649 code on a 2014 GMC Sierra?

The cost can vary, but key reprogramming at a dealership typically ranges from $50 to $150. If more extensive repairs are needed, costs can increase.

10. Can I program the key for my 2014 GMC Sierra myself to fix the P1649 code?

Some vehicles allow for self-programming of keys with specific steps outlined in the ownerâ€™s manual, but many require specialized tools or dealership assistance.