Thread: over fueling?

hi guys.i hooked up a scanner to my gp and the only thing that comes up is short to fuel level sending unit.and that makes sense because my fuel gauge spikes and stays there.so i unplugged the sendingunit(thankyou gm for having a plate in the trunk to get at it)and my fuel gauge is still spiked.so i either have bad wires or the pcm is no good.where is the pcm ground wires located?because it also said the pcm may not be grounding properly.
let me know what you guys think.
thank you in advance

can anyone help me locate a pin out diagrahm for the pcm.would be alot of help.for a 2000 gtp.