2012 Ford Fusion Rack And Pinion – Diagnosis, Replacement, And Epas
The steering system in this specific model year relies on an Electric Power Assisted Steering (EPAS) motor rather than a traditional hydraulic pump. This guide explains how to identify internal sensor failures, navigate the replacement process, and understand the necessary software programming to restore your vehicle’s handling.
It starts with a heavy feeling in the steering wheel or a sudden “Service Power Steering Now” message on your dashboard. Dealing with a 2012 ford fusion rack and pinion issue can be daunting because this generation moved away from hydraulic fluid to a fully electric system. If you are tired of fighting your steering wheel or worried about safety, you are in the right place to find a solution.
In this guide, we will break down the complexities of the Electric Power Assisted Steering (EPAS) system. We promise to provide you with the technical clarity needed to diagnose the problem and the step-by-step instructions to replace the unit if necessary. You will learn about the tools required, the hidden pitfalls of the subframe, and why software calibration is the final piece of the puzzle.
By the end of this article, you will have a professional-grade understanding of how your steering works. We will cover everything from simple mechanical checks to the advanced electronics that control your Ford’s direction. Let’s dive into the mechanics of your Fusion and get you back on the road with confidence.
Understanding the Electric Power Assisted Steering (EPAS) System
Unlike older vehicles that use a belt-driven pump and messy red fluid, the 2012 Fusion utilizes an all-electric unit. The 2012 ford fusion rack and pinion houses a motor, a torque sensor, and a dedicated control module all in one assembly. This design improves fuel economy because the engine does not have to constantly turn a hydraulic pump.
However, this transition to electronics introduces new failure points. The internal torque sensor measures how much force you apply to the steering wheel. If this sensor fails, the computer won’t know how much “assist” to provide, often leading to a total loss of power steering. This is why many owners experience intermittent steering assistance before the system fails completely.
The system also communicates with the vehicle’s main computer via the CAN-bus network. Because it is an electronic component, it is sensitive to voltage drops and poor grounding. Before condemning the entire rack, an experienced DIYer should always check the heavy-gauge wiring and the massive 80-amp fuse located in the high-current fuse box.
Common Symptoms of a Failing 2012 ford fusion rack and pinion
The most obvious sign of trouble is the “Power Steering Assist Fault” or “Service Power Steering Now” warning on the instrument cluster. When these messages appear, the vehicle often defaults to manual steering mode. This makes the car incredibly difficult to turn at low speeds, such as when parking or navigating tight driveways.
You might also notice a strange notchy feeling when turning the wheel. This often indicates a mechanical problem within the internal gears or a failing motor bearing. If you hear a clunking noise when driving over small bumps, it could be the internal rack bushings wearing out, which allows the inner tie rods to wiggle excessively.
Another subtle symptom is the steering wheel failing to return to the center position after a turn. In a healthy EPAS system, the motor helps pull the wheels back to a straight-ahead position. If the internal electronics are failing, the steering may feel “dead” or require manual effort to straighten out after a corner.
Diagnostic Trouble Codes (DTCs) to Watch For
To truly diagnose the system, you need an OBD-II scanner capable of reading the Power Steering Control Module (PSCM). Common codes like C1306 (Steering Wheel Angle Sensor) or C1277 (Torque Sensor) point directly to internal electronic failures. These codes usually mean the internal sensors have moved out of their calibrated range.
If you see a code like U0131, it means “Lost Communication with Power Steering Control Module.” This is often a wiring issue rather than a mechanical failure. Always check the connectors for corrosion or loose pins before spending money on a replacement rack.
Tools and Parts Needed for Replacement
Replacing the steering rack on a Fusion is a labor-intensive job that requires a good set of hand tools. You will need a sturdy floor jack and at least two high-quality jack stands. Never work under the vehicle supported only by a jack, as you will be doing significant prying and pulling near the subframe.
You will need a variety of metric sockets, specifically 10mm, 13mm, 15mm, 18mm, and 21mm. A long extension and a universal joint (swivel) are essential for reaching the steering shaft bolt inside the cabin. A tie rod end puller or a “pickle fork” will also be necessary to separate the outer tie rods from the steering knuckles.
When purchasing a new unit, ensure it is a complete 2012 ford fusion rack and pinion assembly. Most replacements come with new inner tie rods already installed. You should also take this opportunity to buy new outer tie rods, as the old ones are likely worn and must be removed during the process anyway.
The Importance of a Scan Tool
One “pro” tool you might not have is a laptop with FORScan or a high-end diagnostic tablet. Because the 2012 Fusion uses an EPAS system, the new rack must be programmed to the car. The computer needs to know the “As-Built” data to function correctly, which we will discuss in the installation steps.
Step-by-Step Guide to Replacing the Steering Rack
Before you begin, park the vehicle on a level surface and center the steering wheel. Use a bungee cord or a steering wheel lock to prevent the wheel from spinning once the rack is disconnected. If the steering wheel spins freely while disconnected, you will snap the clock spring inside the column, leading to airbag faults.
Step 1: Disconnecting the Steering Shaft
Inside the cabin, look near the brake pedal where the steering column meets the floor. There is a plastic shroud covering the universal joint. Remove the pinch bolt (usually 13mm) that holds the shaft to the rack. Once the bolt is out, slide the shaft upward to separate it from the rack’s input splines.
Step 2: Raising the Vehicle and Removing Wheels
Loosen the lug nuts, jack up the front of the car, and secure it on stands. Remove both front wheels to gain access to the outer tie rods. Spray the tie rod nuts and the subframe bolts with a high-quality penetrating oil to make removal easier.
Step 3: Separating Tie Rods and Wiring
Remove the cotter pins and nuts from the outer tie rods. Use your puller tool to pop them out of the knuckles. Next, locate the two large electrical connectors on the rack itself. Carefully depress the locking tabs and pull the connectors off. Inspect the plugs for any signs of melting or green crusty corrosion.
Step 4: Lowering the Subframe
The 2012 ford fusion rack and pinion cannot be removed without lowering the rear of the subframe. You do not need to remove the subframe completely, but you must drop it about 3 to 4 inches. Support the subframe with a jack, then remove the rear subframe bolts and loosen the front ones slightly.
Step 5: Swapping the Rack
Remove the two large bolts holding the rack to the subframe. With the subframe lowered, you can now wiggle the rack out through the driver-side wheel well. This is a tight fit and may require some patience. Once the old unit is out, slide the new one in and reverse the steps to bolt it down.
Safety Precautions and Critical Decision Points
Safety is paramount when working on steering components. Always use thread-locking compound on the rack mounting bolts and the steering shaft pinch bolt. These components are subject to constant vibration, and a loose bolt here could result in a total loss of vehicle control.
If you find that the subframe bolts are extremely rusty, stop and evaluate. If a subframe bolt snaps off inside the unibody, it becomes a much larger project involving drilling and tapping. Sometimes, it is better to take the car to a professional if the corrosion is structural or severe.
Another critical point is the electrical harness. Ensure the wires are routed exactly as they were from the factory. If the harness rubs against the subframe or the rotating CV axles, it will short out, potentially damaging the new 2012 ford fusion rack and pinion electronics instantly.
The Importance of Post-Installation Alignment and Calibration
Once the mechanical work is finished, the job is only 70% complete. Because you have disturbed the steering geometry, your toe-in settings will be completely off. Even if you measured the tie rods carefully, you must take the vehicle to an alignment shop immediately. Driving without an alignment will ruin your tires in a matter of days.
Furthermore, the EPAS system requires a “Steering Angle Sensor Calibration.” The computer needs to know exactly where the center point is. If the sensor thinks the wheel is turned when you are driving straight, the electronic stability control (ESC) may intervene, applying the brakes unexpectedly while you are driving.
If you are using a tool like FORScan, you will need to perform the “PMI” (Programmable Module Installation) process. This involves uploading the As-Built data from your old rack (if accessible) or manually entering the hexadecimal codes from Ford’s database. This tells the rack which software version to run based on your Fusion’s specific trim and weight.
Frequently Asked Questions About the 2012 Ford Fusion Rack and Pinion
Is there a recall for the 2012 Ford Fusion steering?
Yes, Ford issued recall 15S18 for many 2011-2013 Fusions. This recall addressed a potential fracture in the sensor housing. Check your VIN on the NHTSA website to see if your car was covered. If the recall was never performed, a Ford dealership might replace the rack for free.
Can I drive with a “Power Steering Assist Fault” light on?
While the car is technically driveable, it is not recommended. The steering will be extremely heavy, especially during emergency maneuvers. This puts unnecessary stress on the steering column and can lead to a dangerous situation if you need to swerve quickly to avoid an accident.
How much does a 2012 ford fusion rack and pinion replacement cost?
If you do it yourself, a remanufactured rack costs between $400 and $700, plus the cost of an alignment. A professional shop will typically charge between $1,200 and $1,800, including parts, labor, and the necessary software programming.
Do I need to add power steering fluid?
No. The 2012 Ford Fusion uses an electric system. There is no reservoir, no pump, and no fluid to check. If you see a fluid leak near your steering, it is likely coming from the engine oil pan or the transmission, not the steering rack.
Final Thoughts for the DIY Mechanic
Tackling a steering rack replacement is a rite of passage for any serious DIY mechanic. It requires a blend of heavy-duty wrenching and delicate electronic configuration. While the 2012 Fusion’s EPAS system is more complex than older designs, it is also more precise once properly calibrated.
Remember to take your time with the subframe and always double-check your electrical connections. Dealing with a failing 2012 ford fusion rack and pinion is certainly a challenge, but with the right tools and a safety-first mindset, you can restore your car’s handling to factory standards. Stay safe, keep your tools organized, and enjoy the smooth ride of a job well done!
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