What is a TCU Transmission Control Unit Failure?

1 Answers
AylaLee
07/29/25 4:10pm
Automatic transmission control unit failure. Specific introduction is as follows: 1. Purpose: The automatic transmission control unit TCU (Transmission-Control-Unit) is commonly used in AMT, AT, DCT, CVT and other automatic transmissions. Failure manifestations: 1. Oil leakage: Oil seeps out from the transmission housing or oil pan, one reason is due to aging seals causing poor sealing; another reason is poor manufacturing quality resulting in sand holes in the housing. 2. No response when shifting into gear: The vehicle does not move after shifting into D or R gear and releasing the brake. This situation is mostly caused by damage to the input shaft or reverse gear clutch, or damage to the D/R brake.
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