Details

• Brand:

  

• SKU:

  30919AJ621

• Other Names:

  Unit-AT Control

• Description:

  
  

  Automatic Transmission Control Module – Subaru (30919AJ621)

  The Automatic Transmission Control Module – Subaru (30919AJ621) is a Genuine OEM electronic control unit engineered to regulate the shifting and hydraulic dynamics of Subaru's CVT and automatic transmissions. As the pivotal module in the drivetrain, it processes real-time data—such as vehicle speed, engine RPM, throttle position, and transmission fluid temperature—to precisely manage shift timing, line pressure, and torque converter lock-up. This ensures your vehicle performs with the smoothness, efficiency, and reliability Subaru intends.

  Built with premium electronic components enclosed in a sealed, vibration-resistant casing, the 30919AJ621 is designed to endure the harsh conditions typical of engine bays, including high heat, moisture, and mechanical vibration. Subaru’s OEM-grade manufacturing and validation guarantee long-term durability and consistent transmission behavior. Unlike aftermarket units, this genuine OEM module maintains Subaru’s original calibration—preventing shift irregularities, pressure mismanagement, and premature wear.

  Installation is simplified through its plug‑and‑play, bolt‑on design. The module aligns perfectly with factory mounting brackets and connectors, allowing for straightforward replacement using standard tools—no harness modifications, splicing, or coding required. Once installed, the module resumes factory-programmed shift logic without additional adaptation steps, making it an ideal solution for efficient repairs.

  • Genuine Subaru OEM part – Part Number: 30919AJ621

  • Controls shift events, hydraulic line pressure, and torque‑converter lock‑up with factory calibration

  • Sealed, vibration- and heat-resistant housing ensures durability in engine-bay environments

  • Direct plug‑and‑play installation—no wiring changes or programming needed

  • Preserves Subaru’s original transmission tuning for consistent, smooth, and reliable operation

  Replacing a worn or failing transmission control unit with the Subaru Automatic Transmission Control Module (30919AJ621) restores seamless gear changes, eliminates transmission faults and fault codes, and maintains drivetrain efficiency. Designed and calibrated for Subaru vehicles, this OEM module ensures your car delivers the refined driving experience, dependability, and longevity that Subaru owners expect—mile after mile.

• Condition: New
• Replaces:

  30919aj620

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