Automatic transmission wont shift unless battery disconnected 2006 fwd 2.5

racertim · Post by **racertim** » 06 Mar 2019, 12:43

I have a 2006 XC90 fwd 2.5t with 150K. Long story but needed to have engine replaced. Local mechanic shop (son-in-law but that's another long story) replaced engine with a good used one. Took him forever to get it done so car sat for months at a time. Finally done, engine runs great BUT when you shift it into Drive, it will go forward and shift through the gears. When you come to a stop and want to put it into reverse it will not go into reverse. If you disconnect the battery and then reconnect it, it will then shift into reverse. Same story going back into drive. You have to disconnect the battery and reconnect and then it will shift into drive. So he takes it to local AMCO shop to look at it. All they can say is that the transmission needs rebuilt. The transmission worked flawlessly before the engine was replaced. I am thinking so did they not hook up a wire correctly or what? I find it hard to believe that it was working great before the change out and now it just isn't. I called the local European Motors shop and they said $3000 to replace the transmission with a used transmission. But I am not convinced that is the issue. Does anyone have any advice on how to diagnose what might be happening? The car is in great cosmetic shape, but need to get the mechanical stuff right!

Post by **oragex** » 07 Mar 2019, 10:30

That local AMCO is a scam place. Easy for they to say new transmission, then they wash their hands when even that one won't work.

I'd bring the car to Volvo and ask them to eventually update the transmission software. Don't let/listen to them for anything else, they may also want to skim your pockets. May also look at the front axles shafts, maybe they are not properly fitted, or may not even match well the engine?

And try perhaps on the S60 section to ask members for an honest place around where you live, they may have a suggestion. And may stay on that section because the engine is the same with the S60 and the XC90 section doesn't get much traffic. I also like to use local.google.com and read the reviews left for the garages around.

racertim · Post by **racertim** » 08 Mar 2019, 10:05

Thanks, I will post in the s60 section too!