[SOLVED] P1631 Code – Fixing Theft Deterrent Start Enable Signal Issue

If you see the engine light or service engine soon warning light illuminated on your dashboard, it could be due to the automobile fault code: p1631. This fault code can be caused by a few different factors, including a faulty ignition switch assembly, an open or shorted ignition switch assembly harness, or a poor electrical connection in the ignition switch assembly circuit.

To fix this issue, start by performing a security relearn procedure and visually inspecting the related wiring harness and connectors. Look for any damaged components or broken, bent, pushed out, or corroded connector pins.

This repair is of moderate importance and difficulty, with an estimated repair time of 1.0.

Remember to check the “Possible Causes” listed above for further guidance.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p1631 fault code.

  • The symptoms of the automobile fault code P1631 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code p1631 can be caused by a variety of factors, including a faulty ignition switch assembly, open or shorted ignition switch assembly harness, and poor electrical connection in the ignition switch assembly circuit.

  • The fault code P1631 can be caused by the following: – Not performing the security relearn procedure – A faulty ignition switch assembly – An open or shorted ignition switch assembly harness – Poor electrical connection in the ignition switch assembly circuit.

To fix the automobile fault code p1631, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p1631, follow these steps: 1.
  • Check the possible causes mentioned above.
  • 2.
  • Visually inspect the wiring harness and connectors related to the fault code.
  • 3.
  • Look for any damaged components.
  • 4.
  • Check for broken, bent, pushed out, or corroded pins in the connectors.
  • 5.
  • Repair time estimated at 1.0 hour.

The factors influencing the cost of diagnosing and fixing the automobile fault code p1631 include the estimated repair time of 1.0 hour and the typical hourly rate charged by auto repair shops, which ranges between $75 and $150.

The P1631 fault code refers to the Theft Deterrent Start Enable Signal N.

This code is triggered when the Engine Control Module (ECM) receives incorrect immobilizer data from the Body Control Module (BCM). The BCM and ECM communicate via a serial data circuit, with the BCM sending pre-release information to the ECM.

The ECM then challenges the BCM, and both modules perform a calculation on this challenge. If the calculated response from the BCM matches the calculation performed by the ECM, the vehicle is allowed to start.

After the vehicle starts, the BCM sends the remaining immobilizer data to the ECM.

If the immobilizer data sent by the BCM matches the data stored by the ECM, the engine is allowed to remain running.

However, if the ECM receives incorrect immobilizer data from the BCM, the P1631 fault code is set. This fault code indicates a problem with the theft deterrent system, specifically related to the start enable signal. It is important to diagnose and address this issue to ensure the proper functioning of the vehicle’s immobilizer system.

What are the possible causes for the automobile fault code p1631?

If you see the engine light or service engine soon warning light on, the fault code P1631 could be the culprit. This code can be caused by a few different things. First, try performing a security relearn procedure. If that doesn’t solve the issue, it could be a faulty ignition switch assembly or an open or shorted harness. Make sure to visually inspect the wiring harness and connectors for any damage, and check for broken, bent, pushed out, or corroded pins on the connectors.

How can I visually inspect the wiring harness and connectors to fix the issue?

To fix the issue of the Engine Light being ON or the Service Engine Soon Warning Light, start by performing a security relearn procedure. If that doesn’t solve the problem, it could be due to a faulty ignition switch assembly or an open or shorted ignition switch assembly harness. To visually inspect the wiring harness and connectors, check for any damaged components and look for broken, bent, pushed out, or corroded connector pins. This thorough inspection will help identify any issues and guide you towards the necessary fix.

What should I look for when checking for damaged components or corroded connector pins?

When checking for damaged components or corroded connector pins, there are a few key things to look out for. Start by visually inspecting the related wiring harness and connectors. Check for any signs of damage, such as broken or bent components. Pay close attention to the connector pins and look for any that are pushed out or corroded. These issues can often be the cause of an engine light being on or a service engine soon warning light. By addressing these potential problems, you can ensure a proper fix and prevent further issues down the line.

p1631 error fault code explained

To fix the p1631 fault code, start by performing a security relearn procedure. Then, visually inspect the ignition switch assembly and its wiring harness for any damage or poor electrical connections. Look out for broken, bent, pushed out, or corroded connector pins.

This will help resolve the issue and turn off the Engine Light or Service Engine Soon Warning Light.

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