P1649 2017 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 2017 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.
Code P1649 2017 Chevrolet Silverado Description
What are the Possible Causes of the DTC P1649 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?
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Frequently Asked Questions about P1649 2017 Chevrolet Silverado Code
1. What does OBDII code P1649 mean on a 2017 Chevrolet Silverado?
P1649 indicates that the immobilizer security code has not been programmed or is not recognized by the vehicle's anti-theft system.
2. What are the common symptoms of code P1649 in a 2017 Chevrolet Silverado?
Common symptoms include the engine failing to start, the security light staying illuminated or flashing on the dashboard, and the inability to turn off the anti-theft system.
3. What causes the P1649 code to appear?
The main causes include a key fob or transponder that hasn’t been programmed, a faulty immobilizer system, or communication issues between the immobilizer and the engine control module (ECM).
4. Can a dead key fob battery trigger the P1649 code?
No, a dead key fob battery won’t cause this code, but it can prevent the vehicle from recognizing the key, leading to similar symptoms.
5. How is the P1649 code diagnosed on a 2017 Chevrolet Silverado?
A mechanic will use a scan tool to check for stored codes, inspect the key fob and transponder, verify the immobilizer system’s functionality, and ensure proper communication with the ECM.
6. How can I fix the P1649 code on my Silverado?
Fixes include reprogramming the key or immobilizer, replacing a faulty key fob or transponder, and addressing wiring or communication issues in the anti-theft system.
7. Can I reprogram the key myself to resolve the P1649 code?
Reprogramming the key often requires specialized tools and access to the vehicle’s security system, so it’s typically recommended to have a professional handle it.
8. Is it safe to drive with the P1649 code active?
No, vehicles with a P1649 code often won’t start due to the immobilizer system, so driving is not possible until the issue is resolved.
9. Does replacing the ECM fix the P1649 code?
Replacing the ECM may fix the issue if the ECM is faulty, but it will still need to be programmed to communicate with the immobilizer system.
10. How much does it cost to fix the P1649 code on a 2017 Chevrolet Silverado?
The cost varies depending on the issue, but reprogramming a key or immobilizer typically costs $100–$300, while replacing and programming an ECM could exceed $500.
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