P0785 GMC -

Question

When I start the truck in the morning it won't down shift from third. But when the truck warms up and you shut it off and restart it it works perfect.

Answer 1

Hi there,

The code P0875 indicates an issue with the shifting solenoid. Here is a list of possible causes for you.

P0785 GMC - 3-2 Shift Solenoid Circuit Electrical

Read more: https://www.autocodes.com/p0785_gmc.html

The code P0303 indicates a misfire on cylinder 3. Here is a list of possible causes.

P0303 GMC - Cylinder 3 Misfire Detected

Read more: https://www.autocodes.com/p0303_gmc.html