If you’re driving your Ford Fusion and suddenly see a “Power Steering Assist Fault” message on your dashboard, don’t panic—you’re not alone. This is a common issue in several Ford Fusion model years, especially those that use electric power steering. This guide walks you through everything you need to know to diagnose, fix, and prevent it from happening again.
What Does “Power Steering Assist Fault” Mean?
In short: The “Power Steering Assist Fault” warning means your electric power steering system has stopped working correctly. The system uses sensors, electronic modules, and an electric motor to help you steer with ease. When any part of this system malfunctions, the vehicle disables assist to prevent further damage, making the steering wheel feel very stiff and difficult to turn.
This fault can result from issues ranging from a weak battery to a complete failure of the steering rack or control module.
Symptoms of Power Steering Assist Failure
- Warning message on dash: “Power Steering Assist Fault”
- Stiff or difficult-to-turn steering wheel
- Intermittent loss of steering assist
- EPS light on or check engine light may also appear
- Steering pulls or feels inconsistent
Step-by-Step Diagnosis and Fix
Step 1: Check the Battery and Charging System
The electric power steering system is very sensitive to voltage drops. A weak battery or bad alternator can cause the steering module to shut off.
- Use a multimeter to check battery voltage (12.4V+ is ideal when the car is off, 13.8V+ when running)
- Look for corroded or loose battery terminals
- If the battery is more than 3-5 years old, consider replacing it
- Ensure the alternator is charging properly
Fix: Replace the battery or alternator if needed. Clear the fault codes afterward (Step 6).
Step 2: Inspect Steering System Fuses and Relays
In the Ford Fusion, high-amperage fuses control power to the electric steering rack and module. These are typically located in the engine bay fuse box.
| Fuse Number | Amperage | Function |
|---|---|---|
| F1 | 50A | EPS Motor |
| F2 | 50A | EPS Control Module |
- Pull and inspect fuses for corrosion or damage
- Replace any that are blown with the exact same amperage
Step 3: Scan for Trouble Codes with an OBD-II Tool
You’ll need a scan tool that can read Ford-specific power steering codes—preferably one with access to the PSCM (Power Steering Control Module).
- Plug in the scanner and select the EPS or PSCM module
- Note any codes and their descriptions
- Common codes include: U3000 (control module failure), C1B00 (steering angle sensor fault), or C102D (torque sensor fault)
Fix: Follow code-specific repair recommendations. For example, a steering angle sensor fault may require recalibration or replacement.
Step 4: Recalibrate the Steering Angle Sensor (If Required)
If your scan tool shows a faulty or misaligned steering angle sensor, recalibrating it may fix the issue. This sensor tells the module the position of your steering wheel.
Many modern scan tools have a “steering angle sensor calibration” function. If not, you may need to visit a dealership.
Step 5: Inspect the Steering Rack
The electric motor for power assist is often built into the rack itself. If the motor or internal gears fail, the entire rack usually has to be replaced.
- Listen for unusual noises while turning (clunks, whirring)
- Check for fluid leaks even if the rack is electric (some are semi-hydraulic)
- Use a scan tool to test the EPS motor
Fix: Replace the steering rack if internal failure is confirmed. This is labor-intensive and may cost $1,200–$2,000.
Step 6: Clear Error Codes and Reset the System
Once repairs are complete, you must clear the trouble codes using your scan tool.
- Connect your OBD-II scanner
- Select the PSCM module
- Clear all stored and pending codes
- Restart the vehicle and verify the warning message is gone
Should You Replace the Power Steering Control Module (PSCM)?
The PSCM is essentially the computer for the EPS system. If you’ve ruled out battery, fuses, sensors, and rack—and the fault persists—you may have a bad module.
However, the PSCM must be reprogrammed to your vehicle using Ford’s IDS software. This is not a DIY job unless you have the necessary tools and software licenses.
Fix: Replace and reprogram the PSCM—this usually requires a dealer or experienced Ford tech.
Are There Recalls for Ford Fusion Power Steering Problems?
Yes, but not all years are included. Ford issued several recalls related to power steering in 2011–2014 Fusion models, but earlier and later models may not be covered.
To check your vehicle:
- Find your VIN (on the dash or door frame)
- Go to the official Ford recall website
- Enter your VIN to see if your car qualifies for free repairs
If your Fusion is not under recall but experiences this fault often, you can file a complaint with the NHTSA or ask Ford for goodwill repair assistance.
Estimated Repair Costs
| Repair | DIY Cost | Shop Cost |
|---|---|---|
| Battery or cable replacement | $100–$200 | $150–$300 |
| Fuse and relay replacement | $10–$30 | $50–$100 |
| Sensor recalibration | $0 (if DIY with tool) | $100–$200 |
| Steering rack replacement | $500–$800 (part only) | $1,200–$2,000 |
| PSCM replacement and programming | Not DIY-friendly | $600–$1,000 |
Preventive Maintenance Tips
- Keep battery terminals clean and tight
- Replace battery every 4–5 years
- Scan for codes during regular oil changes
- Avoid driving through deep water or mud that may affect electronics
Conclusion
Fixing a “Power Steering Assist Fault” in your Ford Fusion isn’t always as costly or complicated as it first appears. Start by checking simple issues like battery condition and fuses, and work your way up to sensors, racks, and control modules. With the right tools and approach, you can save hundreds—if not thousands—of dollars on repairs.
Still stuck or uncertain? Don’t hesitate to seek help from a certified Ford technician. And remember—early diagnosis is key to preventing further damage.
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