This procedure covers the replacement of the neutral safety switch (also called transmission range sensor) on a 2015-2020 Ford F-150 with the 5.0L Coyote V8 and rear-wheel drive transmission.

Warnings

Tools required

Parts

• Neutral safety switch / Transmission range sensor × 1 — Ford BR3Z-7F293-A or equivalent
• Transmission drain plug washer × 1 — Ford W707477-S439

Fluids

• Motorcraft MERCON LV ATF — 2.5 qt

Preparation

1. Park vehicle on level ground and apply parking brake firmly
2. Place wheel chocks behind rear wheels
3. Allow engine and transmission to cool completely (minimum 2 hours after operation)
4. Disconnect negative battery cable to prevent accidental starting
5. Raise front of vehicle and support securely on jack stands at frame contact points
6. Remove front skid plate if equipped (four 13mm bolts)

Procedure

1. 1

   Locate the neutral safety switch
   The neutral safety switch is located on the driver's side of the transmission case, approximately mid-way along the transmission body. It is a sensor with a two-wire electrical connector and is mounted with two bolts. Position your drain pan directly below this area as fluid will drain immediately upon removal.
2. 2

   Disconnect electrical connector
   Press the locking tab on the electrical connector and pull straight away from the switch. Do not pull on the wires themselves. If the connector is stuck, use a small flathead screwdriver to gently pry the locking tab while pulling the connector.
3. 3

   Position drain pan
   Position a drain pan with at least 2 gallon capacity directly beneath the neutral safety switch. The switch location is higher on the transmission case, so fluid will drain out forcefully when the switch is removed. Expect approximately 1.5-2.5 quarts of ATF to drain.
4. 4

   Remove switch mounting bolts
   Using a 10mm socket, remove the two mounting bolts securing the neutral safety switch to the transmission case. Keep these bolts as they will be reused. As you remove the second bolt, be prepared for immediate fluid drainage.
   Torque spec

   Mounting Bolts76 Nm (56 lb-ft)
5. 5

   Remove old switch and clean surface
   Pull the neutral safety switch straight out from the transmission case. Allow all fluid to drain completely. Once drainage stops, use shop towels to clean the mounting surface on the transmission case, removing any old gasket material, sealant, or debris. The surface must be completely clean for proper sealing.
6. 6

   Prepare new switch
   Inspect the new neutral safety switch and verify it includes a new O-ring seal. Apply a thin coat of clean MERCON LV ATF to the O-ring to aid installation. Do not use silicone or RTV sealant. If the switch has multiple pin positions, verify the alignment pin matches the transmission case socket.
7. 7

   Install new switch
   Align the new neutral safety switch with the mounting holes and the alignment pin on the transmission case. Push the switch firmly into place, ensuring the O-ring seats properly. Hand-thread both mounting bolts to prevent cross-threading.
   Torque spec

   Mounting Bolts76 Nm (56 lb-ft)
8. 8

   Torque mounting bolts
   Using a torque wrench, tighten the two switch mounting bolts in a crisscross pattern to the specified torque value. Do not overtighten as this can damage the switch housing or transmission case threads.
   Torque spec

   Mounting Bolts76 Nm (56 lb-ft)
9. 9

   Reconnect electrical connector
   Push the electrical connector firmly onto the neutral safety switch until you hear and feel a positive click. Tug gently on the connector to verify it is fully locked. Ensure no wires are pinched or in contact with hot exhaust components.
10. 10

    Refill transmission fluid
    Locate the transmission fill plug on the driver's side of the transmission case. Remove the fill plug using a 10mm socket. Using a fluid transfer pump, add approximately 2.5 quarts of Motorcraft MERCON LV ATF through the fill hole. Fluid should begin to drip from the fill hole when full. Reinstall and torque the fill plug to specification with a new washer if required.
    Torque spec

    Fill Plug42 Nm (31 lb-ft)
11. 11

    Reinstall skid plate
    If the front skid plate was removed, reinstall it using the four 13mm bolts. Ensure all mounting points align properly before tightening.
12. 12

    Lower vehicle and reconnect battery
    Remove jack stands and carefully lower the vehicle to the ground. Reconnect the negative battery cable and tighten securely.

Reassembly

1. Verify all electrical connectors are fully seated and locked
2. Check that no tools or parts were left in the engine bay or under the vehicle
3. Wipe up any spilled transmission fluid from the frame and suspension components to prevent drips

Verification

• With the engine off and parking brake applied, verify the gear selector moves freely through all positions
• Start the engine with the transmission in Park - the engine should crank and start normally
• With foot firmly on the brake, verify the engine will NOT start when the shifter is in Drive or Reverse positions
• Verify the backup lights illuminate when the transmission is shifted into Reverse
• Check the instrument cluster for proper gear position indicator display in all shifter positions
• After a short test drive, recheck the transmission fill level and inspect the neutral safety switch area for any fluid leaks
• Clear any diagnostic trouble codes using a scan tool and verify no new codes appear after testing

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