How to Diagnose and Solve P1636 Theft Deterrent Start Enable Signal Not Correct/Main Relay Malfunction (Power Hold) Issues

Introduction

Are you a car enthusiast who loves to get your hands dirty? Or perhaps you’re a DIYer who enjoys the satisfaction of fixing things yourself? If so, you’re in the right place. Today, we’re going to delve into the world of car diagnostics, specifically focusing on the P1636 error code. This code signifies a problem with the Theft Deterrent Start Enable Signal or a Main Relay Malfunction (Power Hold). But don’t worry, we’ve got you covered with a step-by-step guide to diagnose and solve this issue.

Understanding the P1636 Error Code

Before we dive into the solution, let’s first understand what the P1636 error code means. This code is triggered when the Powertrain Control Module (PCM) detects an incorrect signal from the theft deterrent system or a malfunction in the main relay. This can lead to issues with your vehicle’s starting and running capabilities.

What Causes the P1636 Error Code?

Several factors can cause the P1636 error code. These include a faulty theft deterrent control module, damaged wiring or connectors, a malfunctioning ignition switch, or a defective PCM.

Diagnosing the P1636 Error Code

Now that we understand what the P1636 error code is and what causes it, let’s move on to diagnosing the problem.

Step 1: Visual Inspection

Start by visually inspecting the wiring and connectors related to the theft deterrent system and the main relay. Look for any signs of damage, corrosion, or loose connections.

Step 2: Use a Diagnostic Scanner

Next, use a diagnostic scanner to read the trouble codes stored in the PCM. This will give you a clearer picture of what’s causing the P1636 error code.

Step 3: Test the Theft Deterrent Control Module

Use a multimeter to test the theft deterrent control module. If it’s not functioning correctly, it could be the cause of the P1636 error code.

Solving the P1636 Error Code

Once you’ve diagnosed the problem, it’s time to fix it. Here’s how:

Step 1: Repair or Replace Damaged Components

If you found any damaged wiring or connectors during your visual inspection, repair or replace them as necessary.

Step 2: Replace the Theft Deterrent Control Module

If your tests indicated a faulty theft deterrent control module, replace it.

Step 3: Replace the Ignition Switch or PCM

If the ignition switch or PCM is defective, they will need to be replaced. However, these are complex components, so you may want to consider seeking professional help.

Conclusion

Fixing a P1636 error code can be a bit challenging, but with the right tools and a bit of patience, it’s definitely doable. Remember, the key is to diagnose the problem accurately before attempting any repairs. And always take safety precautions when working on your vehicle.

FAQs

1. What is a P1636 error code?
A P1636 error code is triggered when the PCM detects an incorrect signal from the theft deterrent system or a malfunction in the main relay.

2. What causes a P1636 error code?
A P1636 error code can be caused by a faulty theft deterrent control module, damaged wiring or connectors, a malfunctioning ignition switch, or a defective PCM.

3. How can I fix a P1636 error code?
To fix a P1636 error code, you need to diagnose the problem accurately using a diagnostic scanner and a multimeter. Then, repair or replace any damaged or faulty components as necessary.