4L80/85E Transmissions. 6L90 Transmission
i got a code p01870 component slipping doesn't matter the temp. i can clear the code and i get 4th back but then when the tcc comes on i lose 4th again. i think thats whats going on anyway. coolant temp is steady (ecm sensor) and trans temp is 140 ish.
i changed the oil and filter little bit...