This procedure covers the removal and replacement of the Transmission Control Module (TCM) on a 2021-2024 Ford F-150 with the 3.5L EcoBoost V6 engine and RWD configuration.

Warnings

Tools required

Parts

• Transmission Control Module (TCM) × 1 — Use OEM Ford specification - verify by VIN
• TCM mounting bolts (if corroded or damaged) × 2 — M6 x 1.0 x 25mm

Preparation

1. Park vehicle on level ground and engage parking brake
2. Turn ignition OFF and remove key fob from vehicle
3. Wait at least 2 minutes for all modules to enter sleep mode
4. Open hood and secure with prop rod
5. Disconnect negative battery terminal and isolate cable away from battery post
6. Allow transmission to cool to ambient temperature if vehicle was recently driven

Procedure

1. 1

   Access transmission control module location
   The TCM is mounted on the driver's side of the transmission case, near the front of the bellhousing. From under the vehicle, locate the TCM which is a rectangular aluminum module approximately 6 inches long with a large multi-pin connector on top. You may need to remove the transmission heat shield if equipped for better access.
2. 2

   Remove transmission heat shield (if equipped)
   If your F-150 is equipped with a transmission heat shield, remove the mounting bolts securing it to the transmission case. Set the heat shield aside for reinstallation. Note the orientation and location of any spacers or washers.
   ⚠Heat shield may have sharp edges. Handle carefully to avoid cuts.
   Torque spec

   Mounting Bolts70 Nm (52 lb-ft)
3. 3

   Disconnect TCM electrical connector
   Locate the large gray or black multi-pin connector on top of the TCM. Press down on the red or orange safety tab, then squeeze the connector release tabs on both sides while pulling the connector straight up and away from the TCM. Do not pull on the wiring harness. If connector is difficult to release, use a small flathead screwdriver to gently pry the safety tab while maintaining pressure on the release tabs.
   ⚠Do not force the connector. Broken connector tabs will require expensive harness repair.
4. 4

   Remove TCM mounting bolts
   Using a 10mm socket, remove the two bolts securing the TCM to the transmission case. These bolts thread directly into the transmission housing. Support the TCM with one hand while removing the second bolt to prevent it from falling.
   Torque spec

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

   Remove TCM from transmission
   Carefully pull the TCM straight away from the transmission case. The TCM may have an O-ring seal where it interfaces with the transmission - note its condition. If the O-ring remains in the transmission bore, carefully extract it with a pick or small screwdriver. Inspect the TCM mounting surface on the transmission for any debris or damage.
6. 6

   Inspect and clean mounting surface
   Thoroughly clean the TCM mounting surface on the transmission case using a shop towel. Remove any old O-ring material, transmission fluid residue, or debris. The mounting surface must be clean and dry for proper seal of the new TCM. Inspect the transmission bore where the TCM mounts for any cracks or damage.
7. 7

   Prepare new TCM for installation
   Remove the new TCM from its protective packaging. Verify the part number matches your vehicle's specification. Check that a new O-ring seal is included with the TCM or on the TCM mounting face. If not pre-installed, lubricate the new O-ring with a small amount of clean automatic transmission fluid and install it into the groove on the TCM or transmission case per the service manual illustration.
   ℹ️Some replacement TCMs come with the O-ring pre-installed. Verify before installation.
8. 8

   Install new TCM to transmission
   Align the new TCM with the mounting holes on the transmission case. Carefully push the TCM straight into the transmission bore, ensuring the O-ring seats properly. The TCM should sit flush against the transmission case. Insert both mounting bolts by hand and thread them in 2-3 turns to verify proper alignment before tightening.
9. 9

   Torque TCM mounting bolts
   Using a torque wrench and 10mm socket, tighten the TCM mounting bolts in a criss-cross pattern to specification. Start with the first bolt, then the second, and repeat the sequence to ensure even pressure on the module. Verify the TCM is seated flush against the transmission case after torquing.
   Torque spec

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

    Reconnect TCM electrical connector
    Align the electrical connector with the TCM pins, ensuring proper orientation. The connector will only fit one way. Push the connector straight down onto the TCM until you hear and feel a positive click. Pull gently on the connector to verify it is fully locked. Press the safety tab down until it clicks into the locked position.
    ⚠Verify connector is fully seated. An improperly connected TCM will cause transmission faults and potential damage.
11. 11

    Reinstall transmission heat shield (if equipped)
    Position the transmission heat shield back onto the transmission case, aligning all mounting holes. Install the mounting bolts and torque to specification. Ensure the heat shield does not contact any wiring harnesses or interfere with the TCM connector.
    Torque spec

    Mounting Bolts70 Nm (52 lb-ft)
12. 12

    Reconnect battery and perform initialization
    Reconnect the negative battery terminal and tighten securely. Turn the ignition to ON position (do not start engine) and wait 30 seconds to allow the TCM to initialize. Cycle the ignition OFF, wait 10 seconds, then back to ON. Check the instrument cluster for any transmission-related warning lights.

Reassembly

1. After TCM installation, the module MUST be programmed to the vehicle using Ford IDS or equivalent diagnostic software
2. TCM programming includes VIN writing, transmission adaptive learning reset, and software calibration
3. Perform transmission relearn procedure per Ford service procedures after programming
4. Re-initialize power windows by holding down until fully closed, then continue holding for 2 seconds, then raise fully and hold for 2 seconds

Verification

• Verify no transmission warning lights are illuminated on the instrument cluster
• Start the engine and verify transmission engages all gears smoothly (P-R-N-D)
• Check for transmission fluid leaks around the TCM mounting area
• Perform a short test drive to verify proper shift quality and transmission operation
• Use a scan tool to verify no DTCs (Diagnostic Trouble Codes) are present in the TCM
• Verify transmission adaptive learning is functioning by monitoring live data during test drive
• Confirm all electrical connections are secure and heat shield (if equipped) is properly installed

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