Land Rover Discovery Transmission TCU / ECU Up for sale is a Working, in excellent condition Land rover Transmission Computer / TCU ECU. Part number-- 4460440430 . My list shows this fits many 95-99 year Land rover Discovery cars. your best bet is to match the part number up with the unit you are replacing. A faulty ECU is one of the primary causes of transmission faults. Don't replace a transmission if all your problem is, is a faulty TCU. These can commonly fail if they become water damaged, or is the car had other electrical faults.