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As Adirondack Blues mentions. Fluid quality and topped up?
P0715 indicates you're using a generic code scanner.
The fault indicates a sensor or the wiring to it may be faulty. The speed sensor on the AW-30?
I can no longer find any PDF version of the Volvo Data Pocmket Guide for 700-900 online.
See the AW 30 entry here in the 700-900-90 FAQ:
https://www.brickboard.com/FAQ/700-900/TransmissionAutoAW30.htm
Some links for you. Spook mentions the Volvo Pocket Guide PDF file I have is too old.
Just threw a Trans code on my V90 P0715
http://matthewsvolvosite.com/forums/viewtopic.php?t=36701
I'm unsure a P0175 correlates to the AT 3-1-1. Yet as P0175 comes from a generic scanner, and AT 3-1-1
1998 Volvo S90 "code p0715" Questions
http://matthewsvolvosite.com/forums/viewtopic.php?t=36701
P0715 - OBD-II Trouble Code
https://repairpal.com/OBD-II-Code-P0715
1996 960 Transmission Problems 900 1996
https://www.brickboard.com/RWD/volvo/1575784/940/960/980/V90/S90/1996_960_transmission_problems.html
Unsure if this is related.
1995 960 Ports & Codes 900
https://www.brickboard.com/RWD/volvo/1323435/940/960/980/V90/S90/1995_960_ports_codes.html
You may need to check the sensor wiring or the sensor itself. As the sensor related to this code is under the car, maybe the wiring has failed or the connection between the sensor and the wire harness connector secure to it has become fouled or disconnected.
See what AW30 sensor you find for sale at iPd, Dave Barton, FCP Euro and the like. Hopefully it is accessible.
Questions?
Hope that helps.
Malodorous Residence MacDuff - the neighbor's activities don't help.
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