Ok it's my kids s10 but it has a 4l60e and the p0573 is the solenoid a fault and
then found fluid bubbly and brown, BUT it only has 68K on this 1996 and 4 banger engine. Any ideas what's up?

 

well, I dropped the pan, pulled both shift solenoids, both ohm out
good and both worked fine at 7.5 volts as advertised, replaced
filter and fluid, codes gone, shifts fine, all OK, So I give as to
why it was coding, but it had 2-3 gears only before, now it's
fine, fluid not bubbly, flushed it out again and hope it stays
fixed. I also checked wiring between trans and pcm.

 

Adam,

Hello, I'm in Burleson currently. Anyways, I think you'd probably get more help with this inside the Drivetrain forum. They're used to this type of thing over there.

I wish I could help but I know nothing about trannies, and even less about automatic trannies.

Good luck