2014 Silverado not shift no Speedo
June 28th, 2020, 12:36 AM
#1
CF Beginner
Thread Starter
Join Date: Jun 2020
Location: Hinesville, Ga
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
2014 Silverado not shift no Speedo
Ok so this is the weirdest and tbh most frustrating issue I’ve ever dealt with. My TEHCM needed replaced so I ordered a warrantied rebuilt one. Thanks solenoids for failing. Anyway, I got it installed and now....the speedometer stays at zero. And the truck stays in first. So far I have:
flashed the tcm using GM SDS
updated all modules to current using GM SDS
Mind you I was driving this truck every day before I swapped out the valvebody/TEHCM. So the VSS isn’t bad. On the topic of the VSS. When I watch live data in GDS2, the vehicle speed rapidly fluctuates between 10mph and 250+ mph. Also, when driving I can use GDS2 to manually command a shift to second gear successfully. 3-6 I can command, however it isn’t shifting and I assume it’s because of the speed. I’m at a loss on this. All modules show they have the most current software installed, and the correct vin written to them.
vehicle is throwing no codes at all
flashed the tcm using GM SDS
updated all modules to current using GM SDS
Mind you I was driving this truck every day before I swapped out the valvebody/TEHCM. So the VSS isn’t bad. On the topic of the VSS. When I watch live data in GDS2, the vehicle speed rapidly fluctuates between 10mph and 250+ mph. Also, when driving I can use GDS2 to manually command a shift to second gear successfully. 3-6 I can command, however it isn’t shifting and I assume it’s because of the speed. I’m at a loss on this. All modules show they have the most current software installed, and the correct vin written to them.
vehicle is throwing no codes at all
Thread
Thread Starter
Forum
Replies
Last Post
bamadawg
Beretta, Corsica, & pre-1995 Lumina
0
February 20th, 2017 4:01 PM
cory74700
Tahoe & Suburban
4
April 22nd, 2014 10:09 PM