P1631 2014 GMC Sierra Code - Theft Deterrent Start Enable Signal Not Correct
Quick Answer
The P1631 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the theft deterrent start enable signal is not correct. Common causes include Faulty key fob or key transponder, Malfunctioning ignition switch, Defective immobilizer 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 2014 GMC Sierra indicates Theft Deterrent Start Enable Signal Not Correct.
- Common causes
- Common causes include Faulty key fob or key transponder, Malfunctioning ignition switch, Defective immobilizer 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 2014 GMC Sierra Description
The P1631 diagnostic trouble code (DTC) for a 2014 GMC Sierra 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, thus protecting it from theft.
Common Causes of P1631 2014 GMC Sierra
- Faulty key fob or key transponder.
- Malfunctioning ignition switch.
- Defective immobilizer module.
- Communication error between anti-theft system components.
- Wiring or connection issues within the theft deterrent system.
Symptoms of P1631 2014 GMC Sierra
- Engine cranks but does not start.
- Engine starts but immediately stalls.
- Theft deterrent light illuminated on the dashboard.
- Inability to start the vehicle using the key fob.
How to Fix P1631 2014 GMC Sierra
- Begin by checking the key fob battery and ensuring it is functioning properly.
- Inspect the key transponder for any damage or malfunction.
- Test the ignition switch for proper operation and replace if necessary.
- Scan the vehicle's computer system for any stored fault codes and address any related issues.
- If the problem persists, consult a professional mechanic or dealership for further diagnosis and repair.
Cost to Fix P1631 2014 GMC Sierra
The cost of repairing a P1631 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of replacing a key fob battery or key transponder is relatively low, ranging from $20 to $50. However, if the issue is related to a faulty immobilizer module or ignition switch, the cost can increase significantly, potentially ranging from $200 to $500 or more.
Tech Notes for P1631 2014 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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Frequently Asked Questions about P1631 2014 GMC Sierra Code
What does OBDII code P1631 mean on a 2014 GMC Sierra?
Code P1631 indicates an issue with the theft deterrent system, specifically that the Start Enable Signal sent to the engine control module (ECM) is not correct.
What are the symptoms of code P1631 on a 2014 GMC Sierra?
Symptoms may include the engine not starting, security warning light illuminated on the dashboard, and possible trouble codes stored in the ECM.
What causes the P1631 code to appear on a 2014 GMC Sierra?
Common causes include a malfunctioning theft deterrent control module, faulty key or transponder, wiring issues, or problems with the ECM receiving the correct signal.
How can I fix the P1631 code on my 2014 GMC Sierra?
Possible fixes include reprogramming the theft deterrent system, replacing a faulty key or transponder, repairing damaged wiring, or replacing the theft deterrent control module.
Can a faulty ignition key cause the P1631 code on a 2014 GMC Sierra?
Yes, a damaged or improperly programmed key or transponder can prevent the theft deterrent system from sending the correct Start Enable Signal, triggering the P1631 code.
What tools are needed to diagnose code P1631 on a 2014 GMC Sierra?
You may need an OBDII scanner, a multimeter for checking wiring, and possibly specialized equipment for reprogramming the theft deterrent system.
Is it safe to drive with the P1631 code on a 2014 GMC Sierra?
No, this code typically prevents the engine from starting, so the vehicle may not be drivable.
Can disconnecting the battery clear the P1631 code on a 2014 GMC Sierra?
Disconnecting the battery may reset the ECM temporarily, but without addressing the underlying issue, the code is likely to return.
How much does it cost to repair the P1631 code on a 2014 GMC Sierra?
Repair costs can vary widely depending on the issue. Reprogramming the theft deterrent system may cost $100-$300, while replacing components like the control module or key can cost more.
Do I need to visit a dealership to fix the P1631 code on my 2014 GMC Sierra?
While some repairs, like reprogramming keys or theft deterrent modules, may require dealership tools, independent repair shops can handle many aspects of the diagnosis and repair.
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