AutoCodes – Chevrolet – P1649 2014 Chevrolet Silverado

P1649 2014 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 2014 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 352

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 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 2014 Chevrolet Silverado - Immobilizer Security Code Not Programmed - AutoCodes.com — P1649 2014 Chevrolet Silverado Code - Immobilizer Security Code Not Programmed

What does this mean?

What are the Possible Causes of the DTC P1649 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P1649 2014 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 2014 Chevrolet Silverado Code

1. What does the OBDII code P1649 mean on a 2014 Chevrolet Silverado?

The P1649 code indicates that the immobilizer security code has not been programmed or there is a communication issue with the immobilizer system.

2. What are the common symptoms of code P1649 in a 2014 Chevrolet Silverado?

Symptoms include the engine failing to start, the security light staying illuminated on the dashboard, and possible communication errors with the immobilizer system.

3. What causes the P1649 code to appear on a 2014 Chevrolet Silverado?

This code can be caused by an unprogrammed immobilizer key, a faulty key fob, a malfunctioning immobilizer control module, or wiring/communication issues between the immobilizer system and the ECM.

4. How can I fix the P1649 code on my 2014 Chevrolet Silverado?

Reprogram the vehicleâ€™s immobilizer system with the correct key, check for faulty components in the immobilizer system, and inspect wiring and connections for damage or poor contact.

5. Can I still drive my 2014 Chevrolet Silverado with the P1649 code?

No, the immobilizer system prevents the engine from starting, so the vehicle will not be driveable until the issue is resolved.

6. How much does it cost to fix the P1649 code on a 2014 Chevrolet Silverado?

The cost varies depending on the issue. Key reprogramming may cost $50â€“$150, while replacing components like the immobilizer control module could cost $200â€“$600.

7. Do I need to go to a dealership to fix the P1649 code on my Silverado?

Not necessarily. Many independent automotive repair shops have the tools to program immobilizer systems, but a dealership may be required for more complex issues.

8. Can a dead key fob battery cause the P1649 code?

No, a dead key fob battery typically prevents the key from transmitting a signal but does not directly cause the P1649 code. However, replacing the battery is a good first step to rule out other issues.

9. Can I clear the P1649 code with an OBDII scanner?

You can clear the code temporarily, but if the underlying issue isnâ€™t resolved, the code will reappear once the system detects the problem again.

10. What tools are needed to diagnose and fix the P1649 code?

You may need an OBDII scanner with immobilizer programming capabilities, a multimeter to test wiring, and potentially a GM-specific diagnostic tool for advanced troubleshooting.