Electric Power Steering Module

This procedure covers the removal and replacement of the Electric Power Steering (EPS) module on a 2015-2020 Ford F-150 with 3.5L EcoBoost engine. The EPS module is an electronic control unit that manages the electric power steering system.

Warnings

Tools required

Parts

• Electric Power Steering Module × 1 — Use OEM specification
• Electrical contact cleaner × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Place wheel chocks behind rear wheels
3. Open hood and secure with prop rod
4. Disconnect battery negative terminal and wait minimum 2 minutes
5. Allow engine to cool completely if recently driven

Procedure

1. 1

   Access the EPS module location
   The EPS module is located under the hood on the driver's side firewall area. Remove any engine covers or air intake components that obstruct access to the firewall area near the steering column. On the 3.5L EcoBoost, you may need to remove the engine appearance cover by pulling up on the cover after releasing any retaining clips.
2. 2

   Locate the EPS module
   The EPS module is a rectangular electronic control unit mounted to the firewall on the driver's side, near where the steering column enters the cabin. It will have multiple electrical connectors attached. Use a flashlight to identify the module and verify its location before proceeding.
3. 3

   Disconnect electrical connectors
   Carefully disconnect all electrical connectors from the EPS module. There are typically 2-3 large multi-pin connectors. Press the locking tabs and pull straight out to avoid damaging pins. Note the orientation and position of each connector for reassembly. Inspect connectors for corrosion or damage.
   ⚠Do not pull on wires; grasp only the connector body to prevent wire damage
4. 4

   Remove mounting hardware
   Remove the mounting bolts securing the EPS module to the firewall bracket. There are typically 3-4 bolts holding the module in place. Use the appropriate socket to remove these bolts while supporting the module weight.
5. 5

   Remove the EPS module
   Carefully remove the EPS module from its mounting location. The module may be tight in its bracket, so gently work it free while being careful not to damage any surrounding components or wiring harnesses. Set the old module aside in a clean, dry location.
6. 6

   Inspect mounting area
   Inspect the mounting bracket and firewall area for any signs of water intrusion, corrosion, or damage. Check that all mounting surfaces are clean and free of debris. Verify that the wiring harness connectors are in good condition with no signs of heat damage or corrosion.
7. 7

   Prepare new EPS module
   Remove the new EPS module from its packaging. Verify the part number matches the original module. Handle the module by its edges to avoid static discharge damage to internal electronics. Do not remove any protective covers from electrical connectors until ready to install.
   ⚠Touch a grounded metal surface immediately before handling the new module to discharge any static electricity
8. 8

   Install new EPS module
   Position the new EPS module into the mounting bracket, ensuring proper alignment with mounting holes. The module will only fit in one orientation. Verify that no wiring harnesses are pinched or trapped beneath the module.
9. 9

   Install mounting bolts
   Install the mounting bolts and hand-tighten them first to ensure proper thread engagement. Once all bolts are started, torque them to specification in a cross-pattern to ensure even clamping force.
10. 10

    Reconnect electrical connectors
    Reconnect all electrical connectors to the new EPS module in their original positions. Each connector should click firmly into place when properly seated. Gently tug on each connector to verify it is locked. Apply a light coat of electrical contact cleaner to connections if corrosion was noted during disassembly.
11. 11

    Reinstall removed components
    Reinstall any engine covers, air intake components, or other parts that were removed for access. Ensure all clips and fasteners are properly secured and nothing is left loose in the engine bay.
12. 12

    Reconnect battery
    Reconnect the battery negative terminal and tighten securely. Ensure the connection is clean and tight to prevent electrical issues.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify all mounting bolts are torqued to specification
3. Confirm no tools or parts are left in engine bay
4. The EPS system may require a steering angle sensor calibration using a scan tool after module replacement

Verification

• Turn ignition to ON position (do not start engine) and verify the power steering warning light illuminates briefly then turns off
• Start the engine and verify no warning lights remain illuminated on the instrument cluster
• Turn the steering wheel lock-to-lock while stationary and verify smooth operation with no unusual noises
• Test drive the vehicle at low speed in a safe area and verify normal power steering assist is present
• Use a scan tool to check for any diagnostic trouble codes related to the EPS system
• Verify steering wheel returns to center properly after turns
• If steering angle sensor calibration was performed, verify steering wheel is centered when driving straight

Related trouble codes on this vehicle

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