Insuffient data to compute....How does it drive from a stop, hot, in Low then manualy shifted to D2....OK, or still slips? How does it drive with the ECU out of the loop? disconect your A/T solenoid harness. Watch the tach...is it slugish or slipping with no ECU input? ECU problem is unlikely in that year. Why do you say the scanner reads low presure since A541e's do not give presure readings via the scanner like GM's hydromatics do. Did you connect a mechanical presure gauge?Do you have a code? would you like to share it with us? Sounds like a mekacked forward clutch pack but I need more info bro.....Anyway, what does it mater, you need an experienced A541e A/T guy. Not something you can do at home.
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The fluid level is ok, not burned or anything like that, If I start the car it will go for the first 2 min. after that no gear works, not low, 1,2, reverse, none of them. I didnt know there was a solenoid harness. I have not tried it. I actually took it to the dealer I bought it from, I towed it over there, his mechanic was the one that told me it was low pressure, the rpms, will just rev up, the engine works fine, but after those first 2 min. i have no traction what so ever, the car will not move an inch. I know I can't fix it but I want to have an idea before I take it in, because any place will pill the trannie, then tell me whats wrong with it, then they will charge me weather I fix it or not, I just want as better understanding before I get ripped off.