Engine-Codes.com
Engine-Codes – Chevrolet – P1649 2016 Chevrolet Silverado

P1649 2016 Chevrolet Silverado Code - Immobilizer Security Code Not Programmed

Quick Answer

The P1649 code indicates that the immobilizer security code is not programmed into the vehicle's Engine Control Module (ECM) or that the ECM is unable to recognize the programmed key. Common causes include Faulty or damaged key with a malfunctioning transponder chip, Corrupted or lost programming in the Engine Control Module (ECM), Issues with the immobilizer system, such as damaged wiring or connectors. 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 2016 Chevrolet Silverado indicates Immobilizer Security Code Not Programmed.
Common causes
Common causes include Faulty or damaged key with a malfunctioning transponder chip, Corrupted or lost programming in the Engine Control Module (ECM), Issues with the immobilizer system, such as damaged wiring or connectors.
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 Oct 23, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1649 2016 Chevrolet Silverado Description

The P1649 code indicates that the immobilizer security code is not programmed into the vehicle's Engine Control Module (ECM) or that the ECM is unable to recognize the programmed key. This code is particularly relevant in modern vehicles equipped with advanced anti-theft systems designed to prevent unauthorized access and vehicle theft. When the immobilizer system fails to recognize the key, it can prevent the engine from starting, effectively immobilizing the vehicle.

OBDII Code P1649 2016 Chevrolet Silverado - Immobilizer Security Code Not Programmed
P1649 2016 Chevrolet Silverado Code - Immobilizer Security Code Not Programmed

Common Causes of P1649 2016 Chevrolet Silverado

  1. Faulty or damaged key with a malfunctioning transponder chip.
  2. Corrupted or lost programming in the Engine Control Module (ECM).
  3. Issues with the immobilizer system, such as damaged wiring or connectors.
  4. Malfunctioning ignition switch that fails to communicate with the immobilizer system.
  5. Aftermarket modifications or installations that interfere with the vehicle's security system.

Symptoms of P1649 2016 Chevrolet Silverado

  1. Engine will not start or cranks but does not start.
  2. Dashboard warning lights, particularly the security or immobilizer light, may remain illuminated.
  3. Intermittent starting issues, where the vehicle starts sometimes but not others.
  4. Difficulty in using the key fob or remote start features.
  5. Unresponsive ignition switch or key.

How to Fix P1649 2016 Chevrolet Silverado

  1. Key Reprogramming: Use a professional diagnostic tool to reprogram the key to the ECM, ensuring that the immobilizer recognizes it.
  2. Key Replacement: If the key is found to be faulty or damaged, replacing it with a new key that has a functioning transponder chip may be necessary.
  3. ECM Reprogramming or Replacement: If the ECM is determined to be the issue, it may need to be reprogrammed or, in some cases, replaced entirely.
  4. Wiring Inspection: Inspect the wiring and connectors associated with the immobilizer system for any signs of damage or corrosion, and repair as needed.
  5. Ignition Switch Replacement: If the ignition switch is found to be faulty, replacing it may resolve the communication issues with the immobilizer system.

Cost to Fix P1649 2016 Chevrolet Silverado

The cost to repair the P1649 code can vary widely based on the specific issue identified during diagnosis. Typical costs may range from $100 to $500, depending on whether key reprogramming, key replacement, or ECM repairs are necessary. Labor costs can vary significantly; most auto repair shops charge between $80 and $150 per hour. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer lower rates. It's advisable to check local rates for a more precise estimate and to ensure that the repair shop has experience with immobilizer systems.

Need more information about the P1649 2016 Chevrolet Silverado code?

Need more information on how to fix the P1649 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1649 2016 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2016 Chevrolet Silverado Code

1. What does OBDII code P1649 on a 2016 Chevrolet Silverado mean?

The code P1649 indicates that the Immobilizer Security Code has not been programmed properly.

2. What are the common symptoms of OBDII code P1649 on a 2016 Chevrolet Silverado?

Common symptoms include the vehicle not starting, the engine stalling shortly after starting, and the security light flashing on the dashboard.

3. What could cause the Immobilizer Security Code Not Programmed issue on a 2016 Chevrolet Silverado?

Possible causes include a faulty immobilizer module, a disconnected or damaged wiring harness, or issues with the key fob or key transponder.

4. How can I diagnose the cause of OBDII code P1649 on my 2016 Chevrolet Silverado?

To diagnose the issue, you may need to use a diagnostic scanner to retrieve the specific trouble codes, check the connections to the immobilizer system, and inspect the key fob for any damage.

5. Can I fix OBDII code P1649 on my 2016 Chevrolet Silverado myself?

If the issue is related to programming or reprogramming the immobilizer security code, it is recommended to have it done by a professional automotive technician or a dealership to ensure proper programming and security.

6. Are there any tips for preventing the Immobilizer Security Code Not Programmed problem on a 2016 Chevrolet Silverado?

To prevent this issue, always ensure that your key fob battery is in good condition, avoid exposing the key fob to extreme conditions, and consider having a spare key programmed for emergencies.

7. How much does it typically cost to repair OBDII code P1649 on a 2016 Chevrolet Silverado?

The cost of repairing this issue can vary depending on the specific cause and the labor rates of the repair shop. It is best to get a diagnostic assessment to determine the exact cost.

8. Can the Immobilizer Security Code Not Programmed problem affect the vehicle's overall performance?

While this issue mainly affects the starting and security systems of the vehicle, unresolved problems with the immobilizer can lead to performance issues if the engine is not allowed to start or run properly.

9. Is it safe to continue driving my 2016 Chevrolet Silverado with the Immobilizer Security Code Not Programmed issue?

It is not recommended to drive the vehicle with this issue unresolved, as it may lead to unexpected stalling or starting problems, which can compromise your safety and the security of the vehicle.

10. How long does it take to fix the Immobilizer Security Code Not Programmed problem on a 2016 Chevrolet Silverado?

The repair time can vary depending on the exact cause of the issue and the availability of parts. In some cases, it may be a quick fix, while in others, it may take more time to diagnose and repair the problem effectively.

Discuss the causes and fixes for P1649 2016 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P1649 2016 Chevrolet Silverado comments

No comments found for this page.