How to Diagnose and Solve P1635 Internal Vref Malfunction Issues

Introduction

As a car enthusiast, there’s nothing more frustrating than seeing an error code pop up on your dashboard. One such error code is the P1635, also known as the Internal Vref Malfunction. But don’t worry, I’m here to help you understand what this code means and how to fix it.

Understanding the P1635 Internal Vref Malfunction

The P1635 code is a generic powertrain code related to the vehicle’s speed and idle control system. It indicates that the Powertrain Control Module (PCM) has detected a malfunction in the reference voltage (Vref) sent to multiple sensors.

What Causes the P1635 Code?

The P1635 code can be triggered by several factors, including a faulty PCM, damaged wiring or connectors, or a malfunctioning sensor.

Diagnosing the P1635 Internal Vref Malfunction

Before you start panicking, remember that diagnosing the problem is the first step towards solving it. Here’s a step-by-step guide on how to diagnose the P1635 Internal Vref Malfunction.

Step 1: Use an OBD-II Scanner

An OBD-II scanner is a handy tool that reads the error codes from your car’s computer. Connect it to your vehicle and note down the codes it displays.

Step 2: Inspect the Wiring and Connectors

Check the wiring and connectors for any signs of damage or corrosion. If you find any, it’s best to replace them immediately.

Step 3: Check the Sensors

Inspect the sensors that receive the reference voltage from the PCM. If they’re malfunctioning, they could be the cause of the P1635 code.

Solving the P1635 Internal Vref Malfunction

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

Step 1: Replace Damaged Wiring or Connectors

If you found any damaged wiring or connectors during your inspection, replace them. This could solve the problem.

Step 2: Replace Malfunctioning Sensors

If the sensors are the issue, replace them. Make sure to use high-quality sensors to avoid future problems.

Step 3: Reset the Error Code

After fixing the issue, use your OBD-II scanner to reset the error code. If the code doesn’t come back, you’ve successfully solved the problem.

Conclusion

Dealing with the P1635 Internal Vref Malfunction can be a bit daunting, but with the right tools and a bit of patience, you can diagnose and solve the problem yourself. Remember, it’s always best to consult a professional if you’re unsure about any step in the process.

FAQs

1. What is the P1635 Internal Vref Malfunction?
The P1635 code is a generic powertrain code that indicates a malfunction in the reference voltage sent to multiple sensors.

2. How can I diagnose the P1635 Internal Vref Malfunction?
You can diagnose the P1635 code by using an OBD-II scanner and inspecting the wiring, connectors, and sensors.

3. How can I solve the P1635 Internal Vref Malfunction?
You can solve the P1635 code by replacing any damaged wiring or connectors, replacing malfunctioning sensors, and resetting the error code with an OBD-II scanner.