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TCU TCM Replacement - DIY or Dealer? V70-XC70 2001

posted by  someone claiming to be fedka on  Mon Mar 22 11:24 CST 2010 [RELATED]

I went to a dealer, they said everything was up to date. I did not have codes then.
The car is comfortable and fits my needs perfectly, but it drives like POS, worse than any car I had to date (and I had 3 Oldsmobiles). Just awful.

Ok, so I vented a bit.

The fluid has never been flushed (81K now), it does not smell burnt, and the color is adequate for this mileage. I flushed transmissions before and concluded that it is a waste of time and money. I do not doubt that fresh fluid is alwasy good, but the problems I have now are way too severe to be fixed by fresh fluid.

I wanted to try another TCU, since I still have some miles left on my aftermarket extended warranty, and they said that before they consider paying for transmission they want to make sure this is not TCU (which they do not cover).

Also, there are technical bulletins from Volvo around this time (2001) that describe my exact symptoms and they state that this is consistent with the TCU "failure to adapt". If for some reason adaptation did not finish, the TCU would not know when to shift and would kick gears randomly, like my car does.

So, I can buy a used working TCU for under $100, swap it, and see if it helps.
But if the car will not run after I swap it, I would not try this at home.

So, did anyone swap a TCU? If yes, did teh car start and ran?

Yuri





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