P1649 2017 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 2017 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.
Code P1649 2017 GMC Sierra Description
What are the Possible Causes of the DTC P1649 2017 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 2017 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 2017 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 2017 GMC Sierra code?
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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.
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