This procedure addresses replacement of the vehicle speed sensor (VSS), as 2021-2024 Ford F-150 vehicles use electronic speed sensing rather than a mechanical speedometer cable.

Warnings

Tools required

Parts

• Vehicle Speed Sensor (VSS) × 1 — Use OEM Ford specification for 2021-2024 F-150
• O-ring seal for VSS × 1 — Usually included with sensor

Preparation

1. Park vehicle on level surface and apply parking brake
2. Place wheel chocks behind front wheels
3. Allow transmission to cool if vehicle was recently driven
4. Disconnect negative battery terminal to prevent electrical shorts
5. Raise rear of vehicle using jack and support securely on jack stands rated for vehicle weight
6. Verify vehicle is stable before working underneath

Procedure

1. 1

   Disconnect battery negative terminal
   Using a 10mm socket, loosen the negative battery terminal bolt. Remove the negative cable from the battery terminal and secure it away from the battery to prevent accidental contact.
   Torque spec

   Battery Terminal Bolts8 Nm (6 lb-ft)
2. 2

   Locate the Vehicle Speed Sensor
   Position yourself under the rear of the vehicle near the transmission tailshaft housing. The VSS is mounted on the driver's side of the transmission extension housing, near the output shaft. It is a cylindrical sensor with an electrical connector on top.
3. 3

   Disconnect electrical connector
   Locate the electrical connector on the VSS. Press the locking tab and pull the connector straight off the sensor. If the connector is difficult to remove, gently wiggle it while pulling. Do not pull on the wiring harness itself.
4. 4

   Remove VSS mounting bolt
   Using a 10mm socket, remove the single mounting bolt securing the VSS to the transmission housing. Keep the bolt in a safe location for reinstallation.
   Torque spec

   Mounting Bolts39 Nm (29 lb-ft)
5. 5

   Extract the Vehicle Speed Sensor
   Carefully pull the VSS straight out of the transmission housing. You may need to twist it slightly while pulling. Be prepared for a small amount of transmission fluid to drain from the opening. Have shop towels ready to catch any fluid.
6. 6

   Inspect and clean mounting area
   Inspect the transmission housing bore for debris or metal shavings. Clean the mounting surface with a shop towel. Check the old sensor for damage or excessive wear on the gear teeth (if equipped). Inspect the O-ring seal groove in the housing.
7. 7

   Prepare new VSS for installation
   Remove the new VSS from packaging and verify it matches the old sensor. Ensure the new O-ring is properly seated in the groove on the sensor body. Lightly lubricate the O-ring with a small amount of clean transmission fluid to ease installation.
8. 8

   Install new Vehicle Speed Sensor
   Align the VSS with the transmission housing bore, ensuring any drive gear engages properly with the output shaft. Push the sensor straight into the housing until it seats completely flush against the mounting surface. Do not force it or cross-thread the mounting.
9. 9

   Install and torque mounting bolt
   Insert the mounting bolt through the VSS bracket and thread it into the transmission housing by hand. Using a torque wrench, tighten the mounting bolt to 31 Nm (23 lb-ft). Do not overtighten as this can crack the sensor housing.
   Torque spec

   Mounting Bolts39 Nm (29 lb-ft)
10. 10

    Reconnect electrical connector
    Align the electrical connector with the VSS terminals and push it straight onto the sensor until you hear or feel a positive click. Gently tug on the connector to verify it is fully locked in place. Ensure the connector locking tab is engaged.
11. 11

    Reconnect battery and lower vehicle
    Reconnect the negative battery terminal and tighten the terminal bolt to specification. Carefully lower the vehicle from jack stands and remove wheel chocks.
    Torque spec

    Battery Terminal Bolts8 Nm (6 lb-ft)

Reassembly

1. Ensure all electrical connections are secure and properly locked
2. Check transmission fluid level on dipstick (if equipped) or through fill plug, top off if necessary with Motorcraft MERCON LV ATF
3. Verify no tools or parts were left under the vehicle

Verification

• Start the engine and verify no warning lights appear on the instrument cluster
• Confirm the speedometer reads zero with the vehicle stationary
• Test drive the vehicle and verify the speedometer operates correctly and shows accurate speed
• Check for any transmission fluid leaks around the VSS mounting area
• Verify no ABS, traction control, or transmission-related warning lights are illuminated
• Use a scan tool to verify the PCM is receiving speed signal data from the VSS if available

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