"see manual" wrench light

Wrench Light on Ford Fusion [4 Main Causes & Solution]

In this article, I am going to explain what the wrench light which says “See Manual” on your dashboard means and the main causes for it on your Ford Fusion, and possible solutions, let’s get to it.

What Does the Wrench Light Mean on a Ford Fusion?

In layman’s terms, The wrench light is an indicator that your Ford Fusion’s computer has detected a problem with the car’s powertrain.

A wrench light is not caused by a specific component on your fusion, it could be anything from the engine control module to a sensor that has failed.

If you see this light, it is best to take your Ford Fusion in to be looked at by a qualified technician who can diagnose the problem with a forscan or other diagnostic tool and let you know what is causing it.

However, below I will list the main causes from my experience as a mechanic.

What Causes the Wrench Light on Ford Fusion?

There are several possible causes of the wrench light on your Ford Fusion, some more serious than others. Let’s look at the most common causes for a wrench light on your fusion.

1. Transmission Issues

From working on a lot of Ford fusions in my workshop, I can confidently tell that these vehicles are notorious for having transmission issues.

The transmission is basically the heart of your vehicle, and it needs to be in good condition to ensure that you are getting the best possible performance out of your vehicle.

If there is a problem with your transmission, then this could cause the wrench light to come on. Here are the common things that can go wrong with the transmission.

  • Faulty Torque Converter: The torque converter is a part of the transmission that helps to regulate engine speed while you are driving. If there is a problem with this part, then it can cause the wrench light to come on. This is because when the converter isn’t working properly, it will cause your vehicle to lose power and not move at all.
  • Bad Transmission Temperature Sensor: The transmission temperature sensor is a part that tells the computer how hot your transmission is. If there is a problem with this sensor, then it can cause your vehicle to shift erratically and even stall out when you are driving.
  • Transmission Failure: If your transmission has failed, then it can cause the wrench light to come on. This is because when the transmission fails, it will not be able to transfer power from the engine to the wheels as it should

If you getting transmission-related codes on the obd2 scanner then it is likely that you need to have your transmission serviced.

If you continue to drive with a faulty transmission, then it can cause serious damage to other components of your vehicle.

2. Bad/Disconnected MAF Sensor

Another common cause of a wrench light on a Ford Fusion is a malfunctioning or a Loose MAF sensor

The MAF Sensor on your ford fusion is responsible for measuring the amount of air that is entering your engine. If this sensor is not working properly or has become disconnected, then it will cause the wrench light to come on.

I recommend that you check if the sensor is connected properly and if it is working. If it is not connected, then you need to reconnect it. If the sensor does not work or it has become disconnected, then you will have to replace it with a new one.

3. Failing Fuel Pressure Pump

A failing fuel pressure pump can cause the wrench light to come on.

This is because a defective fuel pump will not be able to supply enough fuel to your engine.

To check if this is the issue, start your Ford Fusion and let it idle for a few minutes while listening carefully for any unusual sounds if you experience stuttering when switching on the engine or If you hear some strange noises coming from there,

Then the Fuel pressure pump may be bad. I have had a few Ford fusions with the same wrench light issue being caused by a bad fuel pump.

4. Bad Battery:

The battery controls most of the electronics on your Ford Fusion and over time the battery can go bad and not hold a charge.

If your Ford Fusion is not starting (or taking longer with dash lights going on and off, then this may be the issue. To check if your battery is bad, remove it from the car and take it to an auto parts store for testing.

How to Deal with a Wrench Light Coming on your Dashboard

Since this is more of a generic fault message, getting diagnostics is what I recommend before getting any parts.

You can get proper diagnostics from the nearest ford dealer or any automotive repair shop with a quality scanner like the “Forscan”.

The issue could be something simple, like a loose connection or a bad sensor and only an OBD II scanner will be able to tell you that.

Can You a Drive a Ford Fusion with a Wrench Light on?

The wrench light coming up on your dashboard could mean a few things, but it doesn’t necessarily mean your entire car is going to fall apart in a matter of seconds.

I don’t personally recommend that you drive too long, in fact have the car checked if this comes up on your dashboard.

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