code po1860 and po742 how to proceed

Question

i had a po742 reset and cleared codes and drove now reset po742 and added po1860 and trans slams hard and makes grinding type noise as vehicle comes to stop 1999 Gmc

Answer 1

Hi there,

These codes indicate an issue with the torque converter clutch. Here is some info for you.

P0742 GMC - Torque Converter Clutch Circuit Stuck On

 

 

Read more: https://www.autocodes.com/p0742_gmc.html

P1860 GMC - TCC PWM Solenoid Circuit Electrical

 

 

Read more: https://www.autocodes.com/p1860_gmc.html