AutoCodes – Chevrolet – P1631 2017 Chevrolet Silverado

P1631 2017 Chevrolet Silverado Code - Theft Deterrent Start Enable Signal Not Correct

Quick Answer

The Body Control Module (BCM) sends the pre-release information to the Engine Control Module (ECM) via the serial data circuit. Common causes include Perform security relearn procedure, Faulty Ignition switch assembly, Ignition switch assembly 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: P1631 2017 Chevrolet Silverado indicates Theft Deterrent Start Enable Signal Not Correct.
Common causes: Common causes include Perform security relearn procedure, Faulty Ignition switch assembly, Ignition switch assembly 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.

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Code Popularity 540

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 17, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1631 2017 Chevrolet Silverado Description

The Body Control Module (BCM) sends the pre-release information to the Engine Control Module (ECM) via the serial data circuit. The ECM then sends a challenge to the BCM. Both the ECM and BCM perform a calculation on this challenge. If the calculated response from the BCM equals the calculation performed by the ECM, the ECM will allow the vehicle to start. The BCM follows this action by sending the remaining immobilizer data to the ECM. If the immobilizer data sent by the BCM matches that stored by the ECM, the ECM will allow the engine to remain running. The Diagnostic Trouble Code (DTC) will be set if the ECM receives incorrect immobilizer data from the BCM.

OBDII Code P1631 2017 Chevrolet Silverado - Theft Deterrent Start Enable Signal Not Correct - AutoCodes.com — P1631 2017 Chevrolet Silverado Code - Theft Deterrent Start Enable Signal Not Correct

What does this mean?

What are the Possible Causes of the DTC P1631 2017 Chevrolet Silverado?

Perform security relearn procedure
Faulty Ignition switch assembly
Ignition switch assembly harness is open or shorted
Ignition switch assembly circuit poor electrical connection

How to Fix the DTC P1631 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 does this mean?

Code Tech Notes

Security Relearn Procedure:

-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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1631 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 P1631 2017 Chevrolet Silverado code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1631 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1631 on a 2017 Chevrolet Silverado?

The common symptoms include the engine not starting, the security light staying on or flashing, and the vehicle going into theft deterrent mode.

2. What causes the OBDII code P1631 on a 2017 Chevrolet Silverado?

The code P1631 typically indicates a problem with the Theft Deterrent Module (TDM) or its communication with the Powertrain Control Module (PCM).

3. How can I diagnose the cause of the OBDII code P1631 on my 2017 Chevrolet Silverado?

Diagnosing this code may require checking the TDM for proper operation, inspecting wiring for any damage, and scanning the system for related trouble codes.

4. Can I still drive my 2017 Chevrolet Silverado with the OBDII code P1631 present?

It is not recommended to drive the vehicle with this code present, as it may lead to starting issues or the vehicle going into theft deterrent mode while driving.

5. How can I reset the OBDII code P1631 on my 2017 Chevrolet Silverado?

Resetting the code typically involves fixing the underlying issue causing the code, such as repairing the TDM or addressing communication problems between modules.

6. Is it safe to reset the OBDII code P1631 on my 2017 Chevrolet Silverado without fixing the issue?

Resetting the code without addressing the underlying problem may temporarily clear the code, but the issue will likely reoccur, potentially leaving you stranded due to starting problems.

7. Can a DIY enthusiast repair the OBDII code P1631 on a 2017 Chevrolet Silverado?

While some basic diagnostics can be done by a knowledgeable DIYer, diagnosing and repairing the TDM or communication issues may require specialized tools and expertise.

8. How much does it typically cost to repair the OBDII code P1631 on a 2017 Chevrolet Silverado?

The cost of repair can vary depending on the specific cause of the code, but it may involve replacing the TDM, addressing wiring issues, or reprogramming modules, potentially costing a few hundred dollars.

9. What should I do if the OBDII code P1631 keeps coming back on my 2017 Chevrolet Silverado?

If the code keeps reappearing after resetting, it is important to thoroughly diagnose the issue, ensuring all possible causes are addressed to prevent further occurrences.

10. Can a faulty key or key fob cause the OBDII code P1631 on a 2017 Chevrolet Silverado?

Yes, a faulty key or key fob can potentially trigger the code P1631 if it is not communicating properly with the vehicle's security system, so it's worth checking the key as part of the diagnostic process.