2012 Ford Fusion Electric Power Steering Replacement

Replacing the electric power steering rack on a 2012 Ford Fusion is a common task due to frequent motor and sensor failures. This guide provides a detailed walkthrough of the physical replacement and the technical requirements to ensure your vehicle returns to the road safely.

Dealing with a stiff steering wheel or a “Service Power Steering Now” message is frustrating and dangerous. If you have determined that your rack and pinion unit has failed, performing a 2012 ford fusion electric power steering replacement is the most effective way to restore your car’s handling.

In this guide, we will break down the entire process from start to finish. You will learn what tools are required, how to safely lower the subframe, and the crucial steps needed to calibrate the new system.

Our goal is to help you save thousands in labor costs while ensuring the job is done with the precision of a professional technician. Let’s get your Fusion back in peak condition.

Understanding the EPAS System Failure

The 2012 Ford Fusion uses an Electric Power Assisted Steering (EPAS) system rather than a traditional hydraulic pump. This system is efficient but prone to internal electronic failures that often require a complete unit swap.

Common symptoms of a failing EPAS include a sudden loss of power assist, a “notchy” feeling when turning, or persistent warning lights. Often, the Power Steering Control Module (PSCM) throws specific codes like U3000, indicating an internal hardware fault.

Before starting your 2012 ford fusion electric power steering replacement, check for any open recalls. Ford issued several recalls (such as 15S18) for these units, and you might be eligible for a free repair at a dealership.

The Problem with the Torque Sensor

The internal torque sensor is frequently the culprit behind steering issues. This sensor detects how much force you apply to the wheel and tells the motor how much to assist.

When this sensor fails, the system usually defaults to a manual steering mode as a safety precaution. Unfortunately, the sensor is integrated into the rack, making a full replacement the only viable fix.

Diagnostic Trouble Codes (DTCs)

Use an OBD-II scanner capable of reading Ford-specific modules before you turn a single wrench. Look for codes starting with “P” or “U” in the PSCM menu.

If you see a code indicating “Internal Electronic Failure,” the mechanical parts of the rack might be fine, but the electronics are toast. This confirms that a replacement is necessary.

Essential Tools and Preparation

A steering rack job is a significant undertaking that requires a solid set of mechanics’ tools. You will be working under the vehicle, so safety equipment is non-negotiable.

You will need a high-quality floor jack and at least two heavy-duty jack stands. Never work under a car supported only by a jack, as the subframe movements can shift the vehicle’s weight.

Gather a socket set including 10mm, 13mm, 15mm, 18mm, and 21mm sizes. An impact wrench will make the subframe bolts much easier to manage, though a long breaker bar also works.

Required Parts and Supplies

• New or remanufactured EPAS steering rack assembly.
• New outer tie rod ends (recommended while you are in there).
• Replacement subframe bolts (Ford recommends replacing these as they are “torque-to-yield”).
• Electrical contact cleaner for the harness plugs.
• Blue threadlocker for non-stretch bolts.

Software Requirements

Unlike older cars, the 2012 Fusion requires software programming after the hardware is installed. You will need a laptop with FORScan software and a compatible OBD-II adapter.

This software allows you to download the “As-Built” data from your old rack and upload it to the new one. Without this step, the new rack may not function or will display an error code.

Step-by-Step 2012 ford fusion electric power steering replacement

Start by parking the car on a level surface and centering the steering wheel. This is critical to prevent damaging the clockspring inside the steering column during the process.

Disconnect the negative battery terminal and wait at least ten minutes. This ensures the airbag system is depowered, providing an extra layer of safety while working near the steering shaft.

Once the car is securely on jack stands, remove the front wheels to gain access to the steering knuckles. You are now ready to begin the mechanical disassembly.

Disconnecting the Tie Rods and Steering Shaft

Remove the cotter pins and nuts from the outer tie rod ends. Use a tie rod puller or a hammer to pop the tie rods out of the steering knuckles.

Inside the cabin, under the dashboard, locate the pinch bolt connecting the steering column to the rack. Remove this 13mm bolt entirely; do not just loosen it.

Carefully pull the intermediate shaft off the rack’s input spline. Pro Tip: Use a bungee cord to hold the steering wheel in place so it cannot spin freely while disconnected.

Lowering the Subframe

The EPAS unit is tucked tightly above the subframe, meaning you must lower the rear of the subframe to create clearance. Support the subframe with a floor jack before loosening any bolts.

Remove the rear subframe bolts (18mm) and loosen the front bolts slightly. Slowly lower the jack a few inches, keeping a close eye on the brake lines and radiator hoses.

You only need about 3 to 4 inches of clearance to slide the old rack out. Ensure the sway bar links are disconnected if they are creating tension on the assembly.

Removing the Electrical Connectors and Rack

There are two main electrical connectors on the PSCM: the heavy power cable and the smaller data harness. Squeeze the tabs and pull them straight out.

Unbolt the two large mounting bolts holding the rack to the subframe. These are usually 18mm and may require significant force to break loose.

Slide the old rack out through the driver-side wheel well. It may take some wiggling and rotating to clear the subframe and heat shields.

Installing the New Steering Rack

Before sliding the new unit in, compare it to the old one to ensure the mounting points and electrical connectors match. Transfer any heat shields from the old unit if the new one lacks them.

Carefully guide the new rack into position through the wheel well. Line up the mounting holes and hand-start the bolts to avoid cross-threading the subframe.

Tighten the mounting bolts to the manufacturer’s torque specification. For the 2012 ford fusion electric power steering replacement, this is typically around 85 lb-ft, but always verify with your service manual.

Reconnecting Hardware

Reconnect the electrical harnesses, ensuring you hear a distinct “click” for each plug. Apply a small amount of dielectric grease to the outer seals to keep moisture out.

Raise the subframe back into position with your floor jack and reinstall the 18mm bolts. If you are using new “stretch” bolts, follow the specific torque-plus-angle instructions.

Reattach the intermediate steering shaft and the pinch bolt. Ensure the shaft is fully seated on the splines before tightening the bolt to 22 lb-ft.

Finishing the Mechanical Assembly

Install your new tie rod ends, counting the number of turns used on the old ones to keep the alignment close. This will allow you to drive the car to an alignment shop safely.

Put the wheels back on and lower the vehicle to the ground. Reconnect the battery terminal and prepare for the electronic phase of the installation.

Double-check all your connections and ensure no tools are left in the engine bay. A quick visual inspection now can prevent a major headache later.

The Programming and Alignment Phase

The most common reason a 2012 ford fusion electric power steering replacement fails is improper programming. The car’s computer needs to know the specific calibration of the new hardware.

Connect your laptop to the OBD-II port and open FORScan. Navigate to the Configuration and Programming section to access the PSCM module.

If you were able to save the “As-Built” data from the old rack, upload it now. If the old rack was unresponsive, you might need to download the factory data from Ford’s website using your VIN.

Performing the Steering Angle Sensor Reset

Once the programming is complete, you must calibrate the Steering Angle Sensor (SAS). This tells the car where “center” is for the stability control and pull-drift compensation.

Follow the on-screen prompts in your software, which usually involve turning the wheel lock-to-lock. The warning lights on the dash should extinguish once this process is successful.

Test the steering feel while the car is idling. It should be smooth and effortless; if it feels heavy, re-check your electrical connections and battery voltage.

The Importance of Professional Alignment

Even if you were careful with the tie rod turns, your toe-in settings will be off. Driving with poor alignment will rapidly destroy your tires and may cause the EPAS to fight itself.

Take the car to a reputable alignment shop immediately. Tell the technician you replaced the steering rack so they can also perform a digital zero-point calibration if their machine supports it.

A proper alignment ensures the car tracks straight and the Active Nibble Control works correctly. This feature filters out road vibrations, providing that smooth Ford Fusion ride quality.

Troubleshooting and Common Mistakes

If you finish the 2012 ford fusion electric power steering replacement and the steering is still heavy, check the “Mega Fuse” near the battery. This 80-amp fuse provides the high-current power the motor needs.

Another common mistake is failing to fully seat the intermediate shaft. If the pinch bolt isn’t perfectly aligned with the groove in the splines, the steering could potentially disconnect while driving.

Listen for “clunking” sounds after the install. This usually indicates that the subframe bolts were not tightened enough or the sway bar links are loose.

Dealing with Persistent Warning Lights

If the “Service Power Steering” light remains on, use your scan tool to check for communication errors. Ensure the high-speed CAN bus wires in the harness aren’t pinched.

Sometimes, a replacement rack from a salvage yard may have a different firmware version. In these cases, a module update via a professional tool like the Ford IDS may be required.

Always verify your ground connections. The EPAS system is extremely sensitive to electrical “noise” and requires a clean, solid ground to the chassis to function without interference.

Frequently Asked Questions About 2012 ford fusion electric power steering replacement

Can I drive the car without programming the new rack?

Technically, the car will move, but you will likely have no power assist or very limited assist. The stability control system will also be disabled, making the car less safe to drive. It is highly recommended to program the unit before hitting the road.

How long does a 2012 ford fusion electric power steering replacement take?

For an experienced DIYer with the right tools, the job typically takes 4 to 6 hours. If you are working on the ground with basic hand tools, plan for a full day. Lowering the subframe is the most time-consuming portion of the task.

Do I really need to lower the subframe?

Yes, there is not enough clearance between the subframe and the firewall to pull the rack out otherwise. You don’t need to remove the subframe entirely, but lowering the rear portion is essential for the 2012 ford fusion electric power steering replacement.

Can I just replace the motor instead of the whole rack?

While some aftermarket kits exist, Ford does not sell the motor separately. Furthermore, the failure is often in the internal sensors or the mechanical gears. Replacing the entire assembly is the only way to ensure a reliable and long-lasting repair.

Is a remanufactured rack as good as a new one?

High-quality remanufactured units from reputable brands are often just as good as new OEM parts. They usually include updated electronics that address the original design flaws. Just ensure the unit comes with a solid warranty for peace of mind.

Final Thoughts on Your Steering Project

Completing a 2012 ford fusion electric power steering replacement is a major milestone for any DIY mechanic. It requires a blend of heavy mechanical work and modern electronic configuration.

By following these steps, you have not only saved a significant amount of money but also gained a deeper understanding of your vehicle’s safety systems. Always prioritize safety, use the correct torque specs, and never skip the professional alignment.

Take your time, double-check your work, and enjoy the feeling of smooth, responsive steering once again. Stay safe on the road and keep your Fusion running strong!