My experience first happened almost two years ago, and I am still putting up with it having spent a total of $1,500.00 to try to resolve it. The first sign of trouble was hard downshifting into second gear. Then, the gear selector lever (rocker arm) would not stay in the automatic position. I had to use a dog collar fastened around it and fastened to the handlebar next to the passenger seat to hold it. Next, I was cruising at 75 mph with the cruise control engaged when suddenly the cruise control disengaged with a bump that I could both hear and feel. The gear indicator inside the speedometer display changed from D to double dashes. (--) The car kept driving, so I decided to keep going. At the end of the interstate exit ramp, I had to stop at a red traffic light. When the light changed green and when I accelerated, the car felt like it was in fourth or fifth gear, but I gave it the gas and it got going. When I got home, backing into my driveway was blind because the transmission problem caused my backup lights to not work. The next day, I called a tranny shop, and the guy told me it would be safe to drive the car to his shop as long as there was not a lot of transmission fluid under the car. So, I dropped it off for his diagnosis. He told me the next day that my tranny was fine, but my "range sensor" was bad. He was too busy with actual transmission problems and said my regular repair shop could replace the range finder. I took it to a shop that specializes in Volvos and gave them all the above info. They said they would advise taking it slowly and start by replacing the rocker arm for a total of $200.00 and see if that would fix it. It did not, but next, whenever I had the money available to take the next step, the error codes had cleared, and they could not find out what sensor was the problem. In the mean time, I discovered that I could shift manually using the driver's side of the rocker arm. Without a manual clutch, I learned that you must regulate your speed and shift at appropriate speed intervals. Finally, I took it to another shop that I had started to use for my wife's 2003 Land Rover Discovery. They felt that the tranny was shot and advised me to drive it until it finally died. I decided to ask them to go ahead replace the sensor that the computer code indicated was the problem. Turned out that there were two: an import sensor and an export sensor. I said okay to replace these for a total of $1,300.00. This did not resolve the problem. Now, the new rocker arm is broken again. It is functioning properly, but the plastic cover over the button you squeeze to shift in & out of Park and Reverse, cracked vertically. I simply taped it with Gorilla Tape, but when the tape failed, I dropped by the shop that installed it. The warranty had expired, but they said that this indicated a more serious transmission problem, but they could not be more specific. That was just a couple days ago, so now I am trying to find a time to take it back to the original tranny specialist who gave me the first optimistic answer. I will update this post if/when that happens.