This procedure covers the replacement of the transmission range sensor on a 2021-2024 Ford F-150 with the 10R80 10-speed automatic transmission paired with the 3.5L EcoBoost V6 engine.

Warnings

Tools required

Parts

• Transmission range sensor × 1 — Use OEM Ford specification
• Transmission range sensor O-ring or gasket × 1 — Often included with sensor

Fluids

• Motorcraft MERCON LV ATF — 0.5 qt

Preparation

1. Park vehicle on level surface and set parking brake
2. Place transmission in Park position
3. Disconnect negative battery terminal and wait 2 minutes for system capacitors to discharge
4. Raise vehicle on lift or with floor jack and support securely on jack stands
5. Allow transmission to cool to ambient temperature if recently driven
6. Locate transmission range sensor on driver side of transmission case, near shift linkage

Procedure

1. 1

   Access the transmission range sensor
   From underneath the vehicle, locate the transmission range sensor on the driver side of the 10R80 transmission case. The sensor is positioned near the manual shift lever on the transmission. Remove any heat shields or guards that may obstruct access using a 10mm socket. Note the position of the manual shift lever before proceeding.
2. 2

   Disconnect electrical connector
   Press the locking tab on the transmission range sensor electrical connector and carefully pull the connector away from the sensor. Inspect the connector terminals for corrosion or damage. Clean terminals with electrical contact cleaner if necessary. Do not pull on wires, only on the connector body.
   ⚠Do not force the connector; ensure locking tab is fully depressed before pulling
3. 3

   Position drain pan
   Place a drain pan underneath the transmission range sensor location. Approximately 0.25-0.5 quarts of transmission fluid may drain when the sensor is removed, depending on fluid level and vehicle position.
   ℹ️Transmission fluid level should be checked after repair is complete
4. 4

   Remove sensor mounting bolts
   Using a 10mm socket, remove the two transmission range sensor mounting bolts. Keep these bolts organized as they will be reused unless damaged. Note the bolt length and position.
   Torque spec

   Sensor Bolts12 Nm (9 lb-ft)
5. 5

   Remove old sensor
   Carefully pull the transmission range sensor straight out from the transmission case. Some twisting motion may be necessary to break the seal. Allow any residual fluid to drain into the pan. Inspect the sensor mounting surface on the transmission case for debris or damage.
   ⚠Do not pry against the transmission case as this may damage sealing surfaces
6. 6

   Clean mounting surface
   Remove the old O-ring or gasket from the transmission case. Clean the sensor mounting surface on the transmission case thoroughly using a wire brush or parts cleaner. Ensure all old gasket material and debris are removed. Wipe the surface clean with a shop towel. The surface must be completely clean and dry for proper seal.
7. 7

   Prepare new sensor
   Remove the new transmission range sensor from packaging. Install the new O-ring or gasket onto the new sensor if not pre-installed. Lightly lubricate the O-ring with clean MERCON LV ATF to ease installation and prevent damage during installation. Do not use any other lubricant.
   ℹ️Verify the new sensor O-ring is properly seated in the sensor groove before installation
8. 8

   Install new sensor
   Align the new transmission range sensor with the manual shift lever on the transmission. The sensor will only fit in one orientation. Carefully push the sensor into the transmission case, ensuring the O-ring does not roll or pinch. The sensor should seat flush against the transmission case mounting surface.
   ⚠Ensure manual shift lever properly engages with sensor internal mechanism; sensor should slide in smoothly without forcing
9. 9

   Install and torque sensor bolts
   Insert the two sensor mounting bolts and hand-tighten. Using a torque wrench, tighten the bolts in a criss-cross pattern to the specified torque of 12.0 Nm (9.0 lb-ft). Do not overtighten as this may crack the sensor housing or damage threads in the transmission case.
   Torque spec

   Sensor Bolts12 Nm (9 lb-ft)
10. 10

    Reconnect electrical connector
    Push the electrical connector onto the new transmission range sensor until you hear and feel a positive click indicating the locking tab has engaged. Gently tug on the connector to verify it is fully locked in place. Ensure wiring is routed away from heat sources and moving components.
11. 11

    Check and top off transmission fluid
    If significant fluid was lost during sensor removal, add MERCON LV ATF through the transmission fill tube to replace lost fluid. Transmission fluid level must be checked with engine running, transmission at operating temperature, and vehicle level following Ford's specific procedure for the 10R80 transmission.
    ℹ️Proper fluid level check requires transmission at 40-60°C and cycling through all gears
12. 12

    Reinstall heat shields
    Reinstall any heat shields or guards that were removed for access. Ensure all fasteners are properly tightened and shields do not contact wiring or moving components.

Reassembly

1. Reconnect negative battery terminal
2. Lower vehicle from jack stands
3. Ensure all tools and parts have been removed from under vehicle

Verification

• With engine off, cycle ignition to ON position and verify no check engine light or transmission warning lights
• Start engine and verify it starts in Park and Neutral only (will not start in any other gear position)
• With foot firmly on brake, shift through all gear positions (P-R-N-D and manual modes) and verify smooth shifting and proper gear indicator display
• Use scan tool to verify transmission range sensor is reporting correct gear position in all selector positions
• Perform a test drive and verify all gears engage properly and shift indicator matches actual gear selection
• Re-check transmission fluid level following Ford's hot check procedure after transmission reaches operating temperature
• Verify no transmission fluid leaks from sensor location after test drive

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