P1631 2018 Chevrolet Silverado Code - Theft Deterrent Start Enable Signal Not Correct
Quick Answer
The P1631 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates that the theft deterrent start enable signal is not correct. Common causes include Faulty wiring or connections in the theft deterrent system, Malfunctioning ignition switch, Defective key fob or key transponder. 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 2018 Chevrolet Silverado indicates Theft Deterrent Start Enable Signal Not Correct.
- Common causes
- Common causes include Faulty wiring or connections in the theft deterrent system, Malfunctioning ignition switch, Defective key fob or key transponder.
- 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 2018 Chevrolet Silverado Description
The P1631 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates that the theft deterrent start enable signal is not correct. This means that the vehicle's anti-theft system is not receiving the proper signal to allow the engine to start. The theft deterrent system is designed to prevent unauthorized individuals from starting the vehicle, providing an added layer of security. When this signal is not correct, the vehicle may not start or may experience issues related to the anti-theft system.
Common Causes of P1631 2018 Chevrolet Silverado
- Faulty wiring or connections in the theft deterrent system
- Malfunctioning ignition switch
- Defective key fob or key transponder
- Problem with the body control module (BCM)
- Issues with the anti-theft system sensors
Symptoms of P1631 2018 Chevrolet Silverado
- Engine cranks but does not start
- Security light illuminated on the dashboard
- Engine starts but immediately shuts off
- Inability to turn the ignition key
How to Fix P1631 2018 Chevrolet Silverado
- Perform a thorough inspection of the theft deterrent system wiring and connections to identify any damaged or loose components.
- Check the ignition switch for proper operation and replace if necessary.
- Test the key fob or key transponder to ensure it is transmitting the correct signal and replace if faulty.
- Scan the vehicle's BCM for any error codes related to the anti-theft system and address any issues found.
- Clear the DTC and perform a relearn procedure for the theft deterrent system to reset the signal and allow the engine to start.
Cost to Fix P1631 2018 Chevrolet Silverado
The typical repair costs for addressing a P1631 code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, parts and labor for this type of repair can range from $200 to $500. It's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may charge less. It's recommended to obtain quotes from local shops to get a more accurate estimate for this repair.
Tech Notes for P1631 2018 Chevrolet Silverado
-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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Frequently Asked Questions about P1631 2018 Chevrolet Silverado Code
1. What does the OBDII code P1631 mean on a 2018 Chevrolet Silverado?
P1631 indicates a "Theft Deterrent Start Enable Signal Not Correct," meaning the vehicle's anti-theft system has detected an issue preventing the engine from starting.
2. What are the common symptoms of a P1631 code on a 2018 Chevrolet Silverado?
Common symptoms include the engine not starting, a security light illuminated on the dashboard, and possible trouble codes related to the anti-theft system.
3. What causes the P1631 code to appear on a 2018 Chevrolet Silverado?
The code can be triggered by a faulty ignition key or fob, a malfunctioning Body Control Module (BCM), wiring issues, or a failing Passlock or Passkey system.
4. Can a dead battery cause the P1631 code on a 2018 Chevrolet Silverado?
Yes, a severely discharged or replaced battery can disrupt the anti-theft system and trigger the P1631 code.
5. How can I reset the anti-theft system to fix a P1631 code on a 2018 Chevrolet Silverado?
You can try a Passlock relearn procedure: turn the ignition key to the "ON" position for 10 minutes until the security light turns off, then repeat this process three times before starting the engine.
6. Can a faulty ignition switch cause the P1631 code on a 2018 Chevrolet Silverado?
Yes, a faulty ignition switch can prevent the anti-theft system from recognizing the proper signal, leading to the P1631 code.
7. Do I need to replace the BCM if I get a P1631 code on my 2018 Chevrolet Silverado?
Not necessarily. The BCM may not need replacement unless it is confirmed faulty after proper diagnostics. Check simpler causes like wiring or key issues first.
8. How much does it cost to repair a P1631 code on a 2018 Chevrolet Silverado?
Repair costs vary depending on the root cause. Key reprogramming or replacement may cost $100-$300, while BCM replacement can range from $300-$800.
9. Can I drive my 2018 Chevrolet Silverado with a P1631 code?
No, the P1631 code typically prevents the engine from starting, so driving the vehicle is not possible until the issue is resolved.
10. Should I take my 2018 Chevrolet Silverado to a dealer for the P1631 code?
If basic troubleshooting like key reprogramming or the relearn procedure doesn’t work, it’s best to consult a dealer or qualified technician for advanced diagnostics and repairs.
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