why does my Ford F-150 have a steering assist fault message

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

Error Codes

1-3 hours

Time

medium

Difficulty

critical

Severity

3 min read

563 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 steering assist fault in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Steering

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening the power steering reservoir.

Symptoms

•Steering feels heavy or unresponsive
•Illuminated warning light on the dashboard
•Difficulty turning the steering wheel
•Sudden loss of steering assistance while driving
•Occasional grinding or clicking noises when steering

Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to retrieve any error codes.
2
Inspect the power steering fluid level and condition; top off or replace as necessary.
3
Check the wiring and connectors for the steering column and power steering control module for any signs of damage.
4
Test the voltage and ground at the power steering motor using a multimeter.
5
Verify the operation of the steering angle sensor by checking for proper calibration and function.
6
Inspect the steering rack for any physical damage or leaks.

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
•Torque wrench
•Power steering fluid

Parts Required

•Power steering fluid
•Steering angle sensor (if faulty)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to retrieve any error codes.
2
Inspect the power steering fluid level and condition; top off or replace as necessary.
3
Check the wiring and connectors for the steering column and power steering control module for any signs of damage.
4
Test the voltage and ground at the power steering motor using a multimeter.
5
Verify the operation of the steering angle sensor by checking for proper calibration and function.
6
Inspect the steering rack for any physical damage or leaks.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, power steering fluid.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to prevent electrical shorts during repairs.

2. Check and Replace Power Steering Fluid

Remove the power steering reservoir cap and check the fluid level.
If the fluid is low, add the appropriate type of power steering fluid as specified in the owner’s manual.
If the fluid is contaminated or burnt, proceed to drain and replace it:
- Locate the power steering fluid return line and disconnect it.
- Allow the old fluid to drain into a container.
- Reconnect the line securely, refill the reservoir with new fluid, and bleed the system if necessary.

3. Inspect and Repair Wiring

Inspect the wiring harness leading to the power steering motor for any frays or breaks.
If damaged, repair or replace the wiring as necessary, ensuring all connections are secure.

4. Test and Replace Steering Angle Sensor

Remove the steering column cover to access the steering angle sensor.
Using a multimeter, check for proper voltage and signal output from the sensor.
If the sensor is faulty, remove it and replace it with a new one, ensuring it is properly calibrated.

5. Reconnect Battery and Clear Codes

Reconnect the battery terminals and ensure they are tight.
Use the OBD-II scanner to clear any fault codes from the system.

6. Test Drive

Start the engine and test the steering system for proper operation.
Make several turns to verify that the steering assistance is functioning as expected.