P0756 GMC Envoy-2005 i already change 1-2 &3-4 shift solenoids but engine light still there

Question

I already change 1-2 &2-3 Shift solenoids but engine light still on car sometimes move very quick in 1st gear and some times start from 3rd gear

Answer 1

Hi there, 

Since replacing the solenoids hasn't solved the issue, it's likely a wiring issue. Here is some more info for you.

P0756 GMC - 2-3 Shift Solenoid Valve Performance - No First or Second Gear

Read more: https://www.autocodes.com/p0756_gmc.html