What is code error 85?

[holden_w427]

Hey peeps,
got a vt v6, just pulled an error code 85, not sure what 85 is but been told it might be something got to do with the tranni??

next thing is there nothin wrong with the tranni that i no of, drives smooth and shifts when it should..

any1 care to help me out?

would really appreciate it..
cheers....

[accentstencil]

Error code 85: Transmission slipping, difference between engine rpm and transmission output rpm. This error does not illuminate the powertrain check light.