Replace the neutral safety switch (also called transmission range sensor) on the 6R80 automatic transmission to restore proper starting and reverse light operation.

Warnings

Tools required

Parts

• Neutral safety switch / Transmission range sensor × 1 — Motorcraft MLPS (TR sensor)
• O-ring seal for TR sensor × 1 — Usually included with sensor

Fluids

• Motorcraft MERCON LV ATF — 1.5 qt

Preparation

1. Park vehicle on level ground and engage parking brake
2. Disconnect negative battery cable to prevent accidental starting
3. Raise vehicle and support securely on jack stands at all four corners
4. Allow transmission to cool if vehicle was recently driven (prevents burns from hot fluid)

Procedure

1. 1

   Locate the neutral safety switch
   Position yourself under the driver's side of the vehicle. Locate the transmission range sensor on the driver's side of the transmission case, near the shift linkage. It has a gray electrical connector with a locking tab.
2. 2

   Disconnect electrical connector
   Press the locking tab on the gray electrical connector and pull straight out to disconnect. Move the wiring harness aside to prevent contamination from transmission fluid.
3. 3

   Position drain pan
   Place a drain pan directly beneath the neutral safety switch. When the switch is removed, transmission fluid will drain from the opening at a moderate rate.
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 bolts in a safe location for reuse.
   Torque spec

   Sensor Bolts14 Nm (10 lb-ft)
5. 5

   Remove the switch
   Carefully pull the switch straight out from the transmission case. Transmission fluid will begin draining immediately. Allow fluid to drain into the pan. Inspect the old switch and O-ring for damage.
   ⚠Transmission fluid may be hot if vehicle was recently operated. Wear gloves to prevent burns.
6. 6

   Clean the mounting surface
   Use shop rags to clean the transmission case mounting surface around the switch opening. Remove any old O-ring material or debris. Use electrical contact cleaner if needed. Do not allow debris to enter the transmission.
7. 7

   Prepare new switch
   Install the new O-ring onto the new neutral safety switch. Lightly lubricate the O-ring with clean MERCON LV ATF to ease installation and prevent damage during insertion.
8. 8

   Install new switch
   Align the switch with the transmission case opening, ensuring the internal alignment pin seats properly into the manual valve shaft. Push the switch firmly into place until it seats flush against the transmission case. The switch can only be installed in one orientation.
9. 9

   Install mounting bolts
   Thread both mounting bolts by hand first to ensure proper thread engagement. Tighten the bolts in a crossing pattern (alternate between bolts) to 14.0 Nm (10.0 lb-ft) using a torque wrench.
   Torque spec

   Sensor Bolts14 Nm (10 lb-ft)
10. 10

    Reconnect electrical connector
    Push the electrical connector onto the new switch until it clicks into place. Ensure the locking tab is fully engaged and the connection is secure.
11. 11

    Refill transmission fluid
    Lower the vehicle. With engine cold, locate the transmission dipstick tube. Using a funnel, add approximately 1-1.5 quarts of Motorcraft MERCON LV ATF to replace the fluid lost during switch replacement. Do not overfill.
12. 12

    Check fluid level
    Start the engine and allow it to reach normal operating temperature. With the engine running and transmission in PARK on level ground, check the transmission fluid level. Add fluid as needed to bring level to the appropriate hot range mark on the dipstick.

Reassembly

1. Reconnect negative battery cable
2. Clear any diagnostic trouble codes using scan tool if check engine light was illuminated
3. Ensure all tools and drain pans are removed from under vehicle

Verification

• With engine running and brake pedal depressed, verify vehicle only starts in PARK and NEUTRAL positions
• Shift through all gear positions (P-R-N-D-L) and confirm smooth shifts with no harsh engagement
• Verify backup lights illuminate when transmission is shifted into REVERSE
• Check for transmission fluid leaks around the switch after running engine for 5 minutes
• Test drive vehicle to confirm proper transmission operation and no warning lights
• Recheck transmission fluid level after test drive and top off if necessary

More procedures for this vehicle