P1631 2015 GMC Sierra Code - Theft Deterrent Start Enable Signal Not Correct
Quick Answer
The P1631 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the theft deterrent start enable signal is not correct. Common causes include Faulty key fob or key transponder, Ignition switch malfunction, Failed theft deterrent 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
- P1631 2015 GMC Sierra indicates Theft Deterrent Start Enable Signal Not Correct.
- Common causes
- Common causes include Faulty key fob or key transponder, Ignition switch malfunction, Failed theft deterrent 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.
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Code P1631 2015 GMC Sierra Description
The P1631 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the theft deterrent start enable signal is not correct. In simpler terms, this means that the vehicle's anti-theft system is not properly recognizing the key or the signal required to start the engine. The theft deterrent system is designed to prevent unauthorized access to the vehicle and to prevent theft. When this code is triggered, it can lead to the vehicle not starting or starting and then immediately shutting off.
Common Causes of P1631 2015 GMC Sierra
- Faulty key fob or key transponder.
- Ignition switch malfunction.
- Failed theft deterrent module.
- Wiring issues or poor connections in the theft deterrent system.
- Faulty engine control module (ECM) communication.
Symptoms of P1631 2015 GMC Sierra
- Engine cranks but does not start.
- Engine starts but immediately shuts off.
- Security light flashing on the dashboard.
- Inability to start the vehicle despite using a known good key.
How to Fix P1631 2015 GMC Sierra
- Begin by checking the key fob and ensuring it is functioning properly. Replace the key fob battery if needed.
- Inspect the ignition switch for any signs of damage or wear. Replace if necessary.
- Check the theft deterrent module for any faults and replace if needed.
- Inspect the wiring and connections in the theft deterrent system for any issues. Repair or replace as necessary.
- If the issue persists, consider reprogramming the ECM to ensure proper communication with the theft deterrent system.
Cost to Fix P1631 2015 GMC Sierra
The cost to repair a P1631 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for this repair could range from $100 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost could fall between $200 and $800. It is important to note that these are rough estimates, and actual costs may vary based on the location, vehicle make and model, and the specific diagnosis and repair process required. It is advisable to consult with a professional mechanic or dealership for a more accurate cost estimate.
Tech Notes for P1631 2015 GMC Sierra
-Insert the key, attempt to start the vehicle, and leave the key in the ON position.
In some vehicles, the Battery and Security light will blink for several seconds, and then shut off. Then the Security light will then remain ON. Leave the ignition ON until the Security light goes OFF. This will take more than 5 mins.
-When the Security light goes OFF, turn the ignition to the OFF position.
-Leave ignition OFF for 20 Seconds.
-Attempt to start the vehicle again and leave the key in the ON position.
-In some vehicles, the Battery and Security light will blink for several seconds, and then shut off. Then the Security light will then remain ON. Leave the ignition ON until the Security light goes OFF. This will take more than 5 mins.
-Turn the ignition to the OFF position for 20 Seconds.
-Attempt to start the vehicle again and leave the key in the ON position.
-In some vehicles, the Battery and Security light will blink for several seconds, and then shut off. Then the Security light will then remain ON. Leave the ignition ON until the Security light goes OFF. This will take more than 5 mins.
-Once this entire procedure has been completed (three times) your vehicle will start on the fourth attempt.
Note: Some vehicles perform the relearn in a different sequence. You may notice your security light, battery light, and abs light will alternate. Once the security light is left out of the sequence that is considered one step. Repeat the procedure two more times and on the fourth time, your vehicle will start.
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