I was traveling down the highway at 65mph my Envoy just started to slow down, I lost all gears. It will shift into neutral and park. When shifted into any other gear it seems like it is in neutral and the vehicle will drift. Otherwise Starts and runs fine. Came up with several codes: P0141, P0128, P0606, P01680, P0106, P0172, P0455 and P0016.

SOURCE: 2007 gmc envoy

you might have an electric problem since the brake switch comunicates with the transmission module

SOURCE: the gear shift on my 2004 gmc envoy does not move from park.

cheak the brake pedel swich it work a swich in the gear seleter

SOURCE: 2001 Yukon XL SLT 4 speed Auto Transmission shift problem!

Sam,

I would start with a transmission fliud and filter service.

I would then have the trasnmission checked out by a transmission shop. The transmission most of the time has the direct drum band is starting to go. The shops can rebuild it no problem, This is a very common failure wiith the trasnmission.

Good Luck

Testimonial: "Thanks alot richtko94'! I'll try that!"

SOURCE: gear shift lever wont go into park

I have a Dodge Charger 06 model and the gear wont move from Park to reverse. everything else works as far as gas, brake light, etc but my gear wont shift can i get soem help

SOURCE: 4l60e no forward or reverse gears operating

It sounds like your torque converter or the pump is broken.