1998 V90 (YV1KW9604W1-046771) sets P0740 (generic) OBD2 reader Code after travel in the 55 mph range. Code suggests the torque converter lockup solenoid (or solenoids) are not able to lock up, for some reason, once triggered by travel speed. Code originally set with "Check Engine" and flashing dashboard UP arrow, along with alternating W and E flashing on shift console. After a day or two, only the Check Engine light remains. Can clear Code with the generic scanner, but it returns after TC lockup conditions are met again. Non-Volvo garage was no help (no Volvo-specific reader), but they cleaned/confirmed outside-the-tranny wiring/connections.

Can anyone suggest what part(s) might be to blame, and, as importantly, where they might still be purchased for this 23 y/o car? Thanks for any guidance.

 

Update - according to this site: https://www.matthewsvolvosite.com/vo...issions-guide/ the transmission in my V90 is a A341E (30-40LE), which I understand was made by Aisin-Warner. According to this site: https://www.oregonperformancetransmi...T-52-0205.html their lock-up solenoid part is;Rostra part number: 52-0205

Vehicle make: Toyota, Lexus, Jeep, [ALSO SHOWS UP IN SEARCH FOR VOLVO V90 ON THEIR SITE]

Transmission model: A340, A340E, A340F, A340H, A341, A341E, A341F, A343, A343E, A343F, AW4, 40-30LE, 30-80LE, V4AW3, 30-40LE, AW30-40LE, 30-43LE, AW30-43LE, 30-43LE, 40-30LE, AW30-43LE, AW40-30LE, Aisin AW, Aisin Seiki, Aisin-Warner

So, it looks like I found the part I need. If anyone's got additional info on this repair, that'd be great. Thanks