Have you used the proper fluid for the transmission? And in case, just find a shop that will replace the trans. Another thing you can do is a software update + clearing adaptations. As for the codes, looks like either a busted sensor or some electrical trouble between it and TCM.

My P1618 cleared itself once I started using the car again. I wonder if a simple wiring fault is also causing that slippage?

Definitely find a shop that does Volvo, pm matt for Brett Borders Volvo shop in Denver’s coordinates

LKQonline has some low mileage trans for $1100.
All of their parts have VIN tagged and odo reading listed on their website.

Another option is to sell it locally. Then buy a low mileage later yr such as 2005-2007 V70 etc for $4000-$5000.

I have made a long post on my efforts to keep my transmission functioning. See here https://www.matthewsvolvosite.com/forums/viewtopic.php?p=662817&hilit=drain+fill#p662817 I am doing another series of drain and fills now after about another 10K miles and returning issues. Your results may vary....

I’d give LubeGuard Shudder Fixx a try. May be a long shot but lots of good Amazon reviews. https://www.amazon.com/Lubegard-19610-Tranny-Instant-Shudder/dp/B00337DUEU/ref=mp_s_a_1_3?crid=LH51QZ81WW4O&dib=eyJ2IjoiMSJ9.DnFIr1xS4lE1UWZZxWE6Z565SWd5Su1RykasjlAyx5Rjw5Sl288-Z2sXIYadiiaVmWK_wQ2JGc86Dcbg...

Btw, a non-working sensor could absolutely cause slipping etc. The speed sensor is important for the calculation of inertia(there is a fallback to a working speed source e.g abs). And inertia is directly proportional to the pressure applied, since inertia is used for pretty much all pressure maps in...

Here’s the 2005 wiring of the 4 pin speed sensor , maybe research what those designations are for help in rewiring?

jlenny wrote: ↑11 Aug 2025, 22:15 My replacement vehicle is a 2007 XC70. I miss how well the T5 goes, stops and turns.

Hilton tune, XC90 brakes, sway bars from XC90 (front), V70R (rear).