tr Volvo 850 / TCU 1997 Up for sale is a Working, in excellent condition Volvo/Aisin TCU. Aisin Part number P09442107 / 09442107. This unit has a 30-day functionality warranty. This should fit the 97 Volvo 850 with automatic transmissions. As always with this type of component, your best bet is to match the part number to the one on your original TCU before ordering. A faulty TCU can cause all sorts of strange shifting issues with these Aisin Warner transmissions. These can also cause issues with erroneous check gearbox lights. If your car does not have these issues but you intend to keep it a while, I recommend our customers keep an extra TCU in the trunk. These units now have to be special ordered from most dealers new for big $$ (often times over $1000!), and you can never find one when you need one. Even now finding a good one second hand is getting to be quite difficult as these cars get older.