why does my Ford F-150 have a warning light for electric power steering

Ford F-150 13th Generation (2015-2020)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

591 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 diagnose and fix the electric power steering warning light on your Ford F-150. Step-by-step guide with symptoms, diagnostics, 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 to prevent shock or short circuits.

Symptoms

•Electric power steering assist is reduced or lost
•Steering wheel feels heavy or difficult to turn
•Warning light on the dashboard specifically for power steering
•Unusual noises when turning the steering wheel
•Intermittent or erratic steering response

Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to check for any stored error codes related to the power steering system.
2
Inspect the power steering fuse and relay for continuity and signs of damage.
3
Verify the condition of the power steering fluid level and check for any leaks in the system.
4
Inspect the wiring and connectors related to the electric power steering motor for corrosion or loose connections.
5
Test the electric power steering motor using a multimeter to ensure it is functioning correctly.
6
Check for any updates or recalls related to the electric power steering system from the manufacturer.

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
•Basic hand tools (socket set, screwdrivers)
•Torque wrench

Parts Required

•Power steering fuse (if faulty)
•Power steering relay (if faulty)
•Power steering fluid (if low)
•Electric power steering motor (if defective)
•Power steering control module (if defective)

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Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to check for any stored error codes related to the power steering system.
2
Inspect the power steering fuse and relay for continuity and signs of damage.
3
Verify the condition of the power steering fluid level and check for any leaks in the system.
4
Inspect the wiring and connectors related to the electric power steering motor for corrosion or loose connections.
5
Test the electric power steering motor using a multimeter to ensure it is functioning correctly.
6
Check for any updates or recalls related to the electric power steering system from the manufacturer.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, basic hand tools (socket set, screwdrivers), torque wrench.
Disconnect the vehicle's negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Replace Fuse/Relay

Locate the fuse box (refer to the owner's manual for location).
Remove the power steering fuse and inspect it for continuity.
If blown, replace it with a fuse of the same amperage.
Check the power steering relay; replace if it shows signs of malfunction.

3. Check Power Steering Fluid

Locate the power steering fluid reservoir.
Inspect the fluid level; top off with the recommended power steering fluid if low.
Look for signs of leaks in the hoses or connections leading to the steering gear.

4. Repair or Replace Wiring/Connectors

Visually inspect the wiring harness leading to the electric power steering motor.
Clean any corroded connectors using electrical contact cleaner.
Repair or replace any damaged wires or connectors as necessary.

5. Test the Electric Power Steering Motor

Reconnect the battery terminal.
Use a multimeter to test the voltage supplied to the electric power steering motor while turning the steering wheel.
If no voltage is detected, further diagnose the control module and wiring.

6. Reprogram or Replace the Power Steering Control Module (if necessary)

If the motor and connections are functional but the warning light remains, reprogram the power steering control module using a compatible scan tool.
If reprogramming fails, replace the power steering control module with an OEM part.