AutoCodes – Chevrolet – P1649 2015 Chevrolet Silverado

P1649 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado 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 337

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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado - Immobilizer Security Code Not Programmed - AutoCodes.com — P1649 2015 Chevrolet Silverado Code - Immobilizer Security Code Not Programmed

What does this mean?

What are the Possible Causes of the DTC P1649 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P1649 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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.