The gearbox control module (TCU — transmission control unit) manages gear shift timing and quality on an automatic gearbox, based on driving style, load, and driver-selected mode.
If you notice any of the following, the part likely needs replacement:
Harsh, delayed, or erratic gear shifts
Gearbox warning light on the dashboard
Transmission stuck in one gear (limp mode)
Installation information
Mounted on or near the gearbox, connecting to the transmission wiring harness — requires specialist adaptation/calibration after replacement.
Frequently asked questions
This "limp mode" is often a deliberate safety response when this module detects a serious fault, defaulting to a single safe gear to protect the transmission from further damage while still allowing the vehicle to be driven to safety.
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August 2026
★★★★★
I ordered a Heater Blower Motor Resistor for a Toyota Avensis. Delivery took eight days from Latvia to Ireland. I installed it, and everything works perfectly. I wish this company success.
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Aleksandr L.
Toyota Avensis
August 2026
★★★★★
No complaints about Evro Trans itself, everything's fine. But the delivery..... It felt like the order was being carried by turtles. 4 days from Riga to Daugavpils. Judging by the tracking, the parcel just sat somewhere behind a shed for 3 days, then they found it and delivered it the next day. I think that's why I won't be ordering there again.
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Paul F.
June 2026
★★★★★
Super fast delivery of the part, and good quality of the used part. Thanks for the service.
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Natālija I.
May 2026
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February 2026
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November 2025
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