P1026 on a V70 P2 is not listed.
http://www.volvoforums.org.uk/showthread.php?t=42231
P code are generic to the OBDII standard but there are few manufacturer specific differences.
Volvo diagnostic computer defines these cades as ECM-XXXX numbers, for instance ECM-902A thru 911A refers to ETM problems
Regards Peter