Question

I have a 2005 GMC Envoy that has no 1/2 and starts in high gear and code P0756

Answer 1

Hi there,

This code indicates an issue with the 2-3 shift solenoid valve. Here is some 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