P1649 Code - Immobilizer Security Code Not Programmed
Quick Answer
The P1649 code indicates that the immobilizer security code has not been programmed into the vehicle's system. Common causes include Incorrect programming of the immobilizer security code, Faulty immobilizer control module, Issues with the key fob or key. 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 indicates Immobilizer Security Code Not Programmed.
- Common causes
- Common causes include Incorrect programming of the immobilizer security code, Faulty immobilizer control module, Issues with the key fob or key.
- 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 P1649 Description
The P1649 code indicates that the immobilizer security code has not been programmed into the vehicle's system. The immobilizer is a security feature that prevents the engine from starting without the correct key or code. When the security code is not programmed, the vehicle may not start or may experience issues related to the immobilizer system. This could potentially lead to the vehicle being unable to start at all, leaving the driver stranded. The immobilizer system works by communicating with the vehicle's engine control unit (ECU) to verify that the correct key is being used. If the security code is not programmed, this communication cannot take place, resulting in the vehicle not starting.
Common Causes of P1649
- Incorrect programming of the immobilizer security code.
- Faulty immobilizer control module.
- Issues with the key fob or key.
- Electrical problems affecting the communication between the immobilizer system and the ECU.
- Aftermarket modifications interfering with the immobilizer system.
Symptoms of P1649
- Engine cranks but does not start.
- Immobilizer light on the dashboard stays illuminated.
- Key fob does not work to unlock or start the vehicle.
- Vehicle starts but then immediately shuts off.
- Engine goes into a limp mode, restricting performance.
How to Fix P1649
- Check the key fob battery and replace if necessary.
- Verify that the correct key is being used and attempt reprogramming.
- Scan the vehicle's computer for any fault codes and address them accordingly.
- If the issue persists, consult a professional automotive locksmith or dealership for reprogramming of the immobilizer system.
- If needed, replace the immobilizer control module.
Cost to Fix P1649
The cost estimate for repairing the P1649 code can vary depending on the root cause of the issue. On average, the repair costs can range from $100 to $500, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary. It's recommended to contact local automotive shops for more accurate pricing.
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Code P1649 Information for Specific Makes
- P1649 Audi — CAN Data Bus ABS No Signal
- P1649 Buick — Immobilizer Security Code Not Programmed
- P1649 Cadillac — Immobilizer Security Code Not Programmed
- P1649 Chevrolet — Immobilizer Security Code Not Programmed
- P1649 GMC — Immobilizer Security Code Not Programmed
- P1649 Volkswagen — CAN Data Bus ABS No Signal
Frequently Asked Questions about P1649 Code
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