You read the codes from the odb connector under the dash, but the normal reader didn't pull tranny codes. The owner at my local trans shop had a box about the size of a loaf of bread that he connected to the odb port and my cig lighter.
He got three codes out. I post in this forum asking for help and there wasn't much of it when it came to 4l80es.
My tranny ran fine for a long time and hard shifts from 1st to 2nd. It had 373s in it so I'm not sure how long it was without OD. It could have been since I bought it. Anyway, it start slipping and taking off in 2nd and then would shift down to 1st build preasure then shift to 2nd. I change the fluid and it made some difference but slowly came back.
I took it to the trans shop and he pulled the codes and then replace the 1/2 solenoid and preasure switch. Everything sweet after that.
Cool, thanks tim.

