There are two different transmissions available on this vehicle. Do you know which you have?
4L60-E / 4L65-E Automatic Transmission
4L80-E / 4L85-E Automatic Transmission
Also, is this the only code set? The issue is similar for both transmissions, but there are different basic tests. If you look below, pic 1 is the diagnostics for the 4L60 and pic 2 is for the 4L80.
Let me know if there are other codes. Also, let me know if the fluid is both clean and full.
See pics below.
Images (Click to enlarge)
Saturday, December 3rd, 2022 AT 11:35 PM