how to troubleshoot electric power steering (EPS) issues in Ford F-150

Ford F-150 12th Generation (2009-2014)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

583 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to troubleshoot and fix electric power steering issues in Ford F-150. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Steering

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the vehicle to cool before working on any components.

Symptoms

•Steering wheel is hard to turn at low speeds
•Loss of power assist while driving
•Steering wheel may feel loose or unresponsive
•Warning light illuminated on the dashboard (EPS light)
•Unusual noises from the steering column or rack
•Sudden steering resistance or jerky motion while turning

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored EPS-related codes.
2
Inspect the EPS fuse and relay for continuity and functionality.
3
Check the power steering fluid level (if applicable) and inspect for leaks.
4
Visually inspect the wiring harness and connectors related to the EPS system for damage or corrosion.
5
Test the EPS control module for proper voltage and ground signals.
6
Monitor the EPS motor operation while turning the steering wheel using a multimeter.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Socket set
•Screwdrivers
•Pliers
•Torque wrench (if needed for module installation)

Parts Required

•EPS fuse (if blown)
•EPS relay (if faulty)
•EPS control module (if defective)
•Power steering fluid (if applicable)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored EPS-related codes.
2
Inspect the EPS fuse and relay for continuity and functionality.
3
Check the power steering fluid level (if applicable) and inspect for leaks.
4
Visually inspect the wiring harness and connectors related to the EPS system for damage or corrosion.
5
Test the EPS control module for proper voltage and ground signals.
6
Monitor the EPS motor operation while turning the steering wheel using a multimeter.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety while working on electrical components.
Allow the vehicle to cool down if it has been running.

2. Inspect and Replace EPS Fuse/Relay

Locate the EPS fuse in the fuse box (refer to the owner's manual for the exact location).
Remove the fuse and check for continuity using a multimeter. Replace it if defective.
Check the EPS relay by swapping it with a similar relay in the fuse box. If the problem is resolved, replace the faulty relay.

3. Repair Wiring Issues

Inspect the wiring harness for any frays, breaks, or corrosion.
Repair any damaged wires by soldering or using heat-shrink tubing for insulation.
Ensure all connectors are clean and securely seated.

4. Replace EPS Control Module (if faulty)

Remove any obstructions to access the EPS control module.
Disconnect the wiring harness from the module.
Unbolt the module from its mounting and replace it with a new unit.
Reconnect the wiring harness ensuring a tight fit.

5. Refill and Bleed Power Steering Fluid (if applicable)

If the EPS system has a fluid reservoir, ensure it is filled with the manufacturer-recommended fluid.
Bleed the system of air by turning the steering wheel from lock to lock with the engine running until no air bubbles are visible in the fluid.