0758 code on 1998 gmc w4l60e trans has new 1-2 1nd 2-3 solinoids won't go into high or 1st gear

Question

have replaced solinoids 1-2 & 2-3 fluid and PRND321 switch no change shifts perfect 1,2,3 no high then when slowing down it goes into limp mode

Answer 1

Hi there,

This code indicates an issue with 2-3 shift solenoid. If replacing the solenoids hasn't solved the issue, it's likely a wiring problem. Here is some more info for you.

P0758 GMC - 2-3 Shift Solenoid Circuit Electrical

Read more: https://www.autocodes.com/p0758_gmc.html