Replace the transmission range sensor (inhibitor switch) on a 2016-2024 Hyundai Tucson 2.5L AWD to restore proper gear position detection and shift interlock function.

Warnings

Tools required

Parts

• Transmission Range Sensor (Inhibitor Switch) × 1 — Hyundai OEM 42700-3B200 or equivalent
• Transmission Range Sensor O-ring/Gasket × 1 — Usually included with sensor

Fluids

• Hyundai SP-IV-M ATF — 1 qt

Preparation

1. Park vehicle on level ground and engage parking brake
2. Place wheel chocks behind rear wheels
3. Disconnect negative battery cable and wait 3 minutes for airbag system discharge
4. Raise front of vehicle and secure on jack stands
5. Remove engine undercover panels for transmission access

Procedure

1. 1

   Locate transmission range sensor
   From underneath vehicle, locate the transmission range sensor on the driver's side of the transmission case, near the manual control shaft. The sensor is mounted vertically with an electrical connector on top and is located above the transmission pan.
2. 2

   Disconnect electrical connector
   Press the locking tab on the range sensor electrical connector and pull straight up to disconnect. Move the wiring harness aside to provide clearance for sensor removal.
3. 3

   Position drain pan
   Place drain pan directly beneath the transmission range sensor. Expect approximately 0.5-1.0 quart of ATF to drain when sensor is removed. The sensor is located above the fluid level but some spillage will occur.
4. 4

   Remove sensor mounting bolts
   Remove the two 10mm mounting bolts securing the transmission range sensor to the transmission case. Support the sensor as you remove the second bolt to prevent it from dropping.
   Torque spec

   Sensor Bolts11 Nm (8 lb-ft)
5. 5

   Remove old sensor
   Carefully pull the transmission range sensor straight out from the transmission case. The sensor shaft engages with the manual control shaft inside the transmission. Note the orientation of the sensor and the position of the alignment features before complete removal.
6. 6

   Inspect and clean mounting surface
   Remove the old O-ring or gasket from the sensor mounting bore in the transmission case. Clean the mounting surface with a lint-free rag. Inspect for damage, cracks, or metal debris. Check that the manual control shaft inside the bore rotates smoothly.
   ⚠Do not allow debris to enter the transmission case opening. Cover with clean rag if installation is delayed.
7. 7

   Prepare new sensor
   Install the new O-ring or gasket onto the new transmission range sensor. Lightly coat the O-ring with clean Hyundai SP-IV-M ATF to aid installation and prevent damage. Verify the sensor alignment pin or flat surface matches the old unit.
8. 8

   Install new sensor
   Align the transmission range sensor shaft with the manual control shaft inside the transmission. The sensor will only fit in one orientation due to the alignment features. Push the sensor straight into the bore until it seats flush against the transmission case mounting surface. Ensure proper engagement by gently rotating the sensor - it should not spin freely.
   ⚠Do not force the sensor. If it does not seat easily, remove and verify shaft alignment. Forcing can damage internal components.
9. 9

   Install mounting bolts
   Install the two sensor mounting bolts and hand-tighten. Ensure the sensor remains fully seated against the transmission case. Torque bolts to specification in a criss-cross pattern to ensure even seating.
   Torque spec

   Sensor Bolts11 Nm (8 lb-ft)
10. 10

    Reconnect electrical connector
    Reconnect the electrical connector to the transmission range sensor. Ensure the connector locks securely with an audible click. Verify the locking tab is fully engaged.
11. 11

    Check and refill transmission fluid
    With vehicle still raised and level, remove the transmission fill plug on the side of the transmission case. Add Hyundai SP-IV-M ATF through the fill hole using a fluid transfer pump until fluid begins to drip from the fill hole. Reinstall fill plug. Check transmission dipstick if equipped and verify proper level per owner's manual procedure.
12. 12

    Reinstall undercovers and lower vehicle
    Reinstall all engine undercover panels removed during preparation. Lower vehicle from jack stands. Reconnect negative battery cable.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify transmission fluid level is correct using proper warm-up procedure
3. Double-check that all undercover panels are securely fastened

Verification

• Start engine with foot firmly on brake pedal - engine should start in Park or Neutral only
• Verify gear position indicator on instrument cluster matches shift lever position in all gear positions (P, R, N, D)
• Test that shift lever cannot be moved out of Park without pressing brake pedal
• Check for transmission fluid leaks around range sensor after engine reaches operating temperature
• Perform test drive and verify smooth shifting through all gears with no warning lights
• Use OBD-II scanner to verify no transmission range sensor codes are present

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