P1649 2017 GMC Sierra Code - Immobilizer Security Code Not Programmed
Quick Answer
The P1649 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that the Immobilizer Security Code has not been programmed into the vehicle's system. Common causes include Faulty key or key fob, Wiring issues in the immobilizer system, Faulty immobilizer control module. 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 2017 GMC Sierra indicates Immobilizer Security Code Not Programmed.
- Common causes
- Common causes include Faulty key or key fob, Wiring issues in the immobilizer system, Faulty immobilizer control module.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1649 2017 GMC Sierra Description
The P1649 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that the Immobilizer Security Code has not been programmed into the vehicle's system. The immobilizer system is a security feature that prevents the engine from starting without the correct key or key fob. When the security code is not programmed, the vehicle will not start, and the engine will not run. This code is typically triggered when there is a communication error between the immobilizer system and the engine control module (ECM).
Common Causes of P1649 2017 GMC Sierra
- Faulty key or key fob
- Wiring issues in the immobilizer system
- Faulty immobilizer control module
- ECM software malfunction
- Battery voltage issues
Symptoms of P1649 2017 GMC Sierra
- Engine cranks but does not start
- Security light on the dashboard stays illuminated
- Inability to start the engine with the correct key
- Engine stalls immediately after starting
- Loss of power while driving
How to Fix P1649 2017 GMC Sierra
- Verify the immobilizer system is the cause of the issue by checking for other DTCs and performing a thorough diagnosis.
- Program the Immobilizer Security Code using a diagnostic scan tool and the manufacturer's programming instructions.
- Check and repair any wiring issues in the immobilizer system.
- Replace the immobilizer control module if it is found to be faulty.
- Clear the DTC and perform a test drive to ensure the issue has been resolved.
Cost to Fix P1649 2017 GMC Sierra
The cost of repairing the Immobilizer Security Code Not Programmed issue can vary depending on the specific cause of the problem. In general, the cost of programming the Immobilizer Security Code and diagnosing any related issues can range from $100 to $300. If parts such as the immobilizer control module need to be replaced, additional costs may apply. It is recommended to consult with a qualified mechanic or dealership for an accurate estimate based on the specific circumstances of the vehicle. Labor rates at auto repair shops can vary, so it's advisable to inquire about rates in your local area for a more precise cost estimate.
Need more information about the P1649 2017 GMC Sierra code?
Need more information on how to fix the P1649 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1649 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1649 2017 GMC Sierra Code
1. What does the OBDII code P1649 mean on a 2017 GMC Sierra?
P1649 indicates that the immobilizer security code is not programmed or recognized, which prevents the engine from starting.
2. What are the common symptoms of the P1649 code in a 2017 GMC Sierra?
Common symptoms include the engine not starting, the security light staying illuminated or flashing, and potential issues with key recognition.
3. What causes the P1649 code to appear?
The code is often caused by a mismatch between the engine control module (ECM) and the immobilizer system, a faulty key, or a failed programming procedure.
4. How can I fix the P1649 code on my GMC Sierra?
The fix typically involves reprogramming the immobilizer security code using a compatible scan tool or replacing and programming the key or ignition module.
5. Can a dead battery cause the P1649 code to appear?
Yes, a dead or disconnected battery can sometimes cause the immobilizer system to lose synchronization, triggering the P1649 code.
6. Do I need to replace the ECM if I get the P1649 code?
Not necessarily. The issue is often resolved by reprogramming the immobilizer system. Only replace the ECM if it is confirmed to be faulty.
7. Can I clear the P1649 code without addressing the problem?
Clearing the code without reprogramming the immobilizer system will not solve the issue, and the code will likely reappear.
8. How much does it cost to fix a P1649 code on a 2017 GMC Sierra?
The cost varies but typically ranges between $100 and $300 for reprogramming or key replacement, depending on dealership or locksmith rates.
9. Can a locksmith fix the P1649 code on a GMC Sierra?
Yes, many automotive locksmiths have the tools to program keys and immobilizer systems, which can resolve the P1649 code.
10. Should I tow my GMC Sierra to a dealership for the P1649 code?
If you do not have access to a compatible scan tool for reprogramming, towing it to a dealership or qualified repair shop is recommended.
Discuss the causes and fixes for P1649 2017 GMC Sierra OBDII Code
Code P1649 2017 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.