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AUDI B9.5 TCU UNLOCK GUIDE

2021+ S4, S5, & SQ5

Welcome to our step-by-step guide for verifying if your 2021+ Audi B9.5 S4, S5, or SQ5 Transmission Control Unit (TCU) is compatible with iE’s Stage 2 o Stage 3 Performance Transmission Tunes. Due to advanced security locks, we must ensure your TCU can be flashed before you purchase. There is no way to tell if you can upgrade this TCU without a quick and easy test -you will need your iE POWERlink for that. Don’t worry, our iE ECU tune will still deliver full power even if your TCU is locked.

STEP-BY-STEP GUIDE

WHAT YOU'LL NEED

STEP 1: FLASH THE "AL552 UNLOCK"

  1. Launch the App: Plug in your iE OBDII dongle, open start the POWERlink app

  2. Navigate to the Transmission Tune Tab: Click the Transmission Tune section in the app.

  3. Select "AL552 Unlock": This free test flash check’s your TCU’s security status.

  4. Flash the Unlock: Follow the on-screen instructions to flash the "AL552 Unlock" to your vehicle.

STEP 2: CHECK THE RPM GAUGE

  1. Observe the Digital RPM Gauge: After completing the unlock flash, start your vehicle and pay close attention to the digital RPM gauge on your dashboard.

  2. Interpret the Results:
    • Successful Flash: The RPM gauge will show the standard 7K RPM limit if the TCU is flashable.
    • Locked TCU: If the TCU is locked, the display will show a 1K RPM limit.

IF YOUR TCU IS FLASHABLE

Congratulations! You can now purchase and flash the iE B9.5 TCU Tune whenever ready. No additional steps are required.

IF YOUR TCU IS LOCKED

  1. Revert to Stock: Tune the Transmission TCU file back to stock before starting or driving your vehicle (important step, do not skip).

  2. Enjoy Your ECU Tune: Your ECU tune will still be fully operational and enhance your driving experience without the TCU tune.

  3. Stay Updated: Sign up for our mailing list (popup on home page) to get notified when a solution for your locked TCU becomes available.

If you have any questions or run into issues during this process, get fast and easy help from our expert team of Mod Gurus.