2021 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE

Transmission Control Module (TCM): Installation

WARNING: This page is about a different variant/trim than selected.
CAUTION:
  • When replacing the TCM, be sure to perform [Start count reading ECU to SSM] before operation and perform [Start count writing SSM to ECU] after operation. Ref. to AUTO START STOP (DIAGNOSTICS)>WORK SUPPORT>NOTE .
  • When [Start count reading ECU to SSM] cannot be performed due to TCM malfunction, be sure to replace the starter and fuel pump relay at the same time.

Starter: 

Ref. to STARTING/CHARGING SYSTEMS (H4DOTC)>STARTER .

Fuel pump relay: 

Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>FUEL PUMP RELAY .

  1. Install the TCM.

    Tightening torque: 

    7.5 N.m (0.8 kgf-m, 5.5 ft-lb)

  2. Connect the connector.
    NOTE: Move the lock lever and confirm that a clicking sound is heard.
  3. Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
  4. Perform "Clear AT learning value" and "AT learning mode" using the Subaru Select Monitor. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>AT LEARNING .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.