P0810 is Clutch Postion Control error
P1618 is Volvo Fault in Lead Between AW 50-52 and Motronic 4.3 (MIL Requested, which means dash light on....some type of serial connection error)
I did not specifically find the last code in any literature...it was derived from doing a google search with that code and "volvo."
Some have indicated that it may be a speed sensor malfunction...both seem related to signal from transmission and probably one set the other off. Check here: http://volvospeed.com/vs_forum/index.php?showtopic=22531&pid=250441&mode=threaded&show=&st=entry250441
Good luck and hope you get everything figured out.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.
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