17 Tahoe Transmission Issues

[Billydunwoody]

Hello Peeps,
I have a 17 Tahoe RWD w trailer max package that I bought last year after trading my 08 in. For the last 6 months ive been having the following issues:
1. Harsh upshift 1-2 only when cold
2. Hars downshift when braking, no matter the temp

The fluid and filter were replaced just before I bought the car and I did it again with all GM parts 3 months ago with no improvement. I also got a custom tune to see if there was any help and it didnt do anything either. I have no codes and I also scanned the transmission module for codes using my Foxwell, no codes. I have an appointment with the dealer as it has a Ford ESP warranty but that appointment is a month away.

Anyone have any insight as what these issues could be?

Thanks!

 

[Joseph Garcia]

@NickTransmissions is our resident transmission expert, and he may be able to provide some troubleshooting tips.

 

[NickTransmissions]

Hello Peeps,
I have a 17 Tahoe RWD w trailer max package that I bought last year after trading my 08 in. For the last 6 months ive been having the following issues:
1. Harsh upshift 1-2 only when cold
2. Hars downshift when braking, no matter the temp

The fluid and filter were replaced just before I bought the car and I did it again with all GM parts 3 months ago with no improvement. I also got a custom tune to see if there was any help and it didnt do anything either. I have no codes and I also scanned the transmission module for codes using my Foxwell, no codes. I have an appointment with the dealer as it has a Ford ESP warranty but that appointment is a month away.

Anyone have any insight as what these issues could be?

Thanks!

Worn 2-6 clutch boost and/or regulator valve, worn PR valve (very common), worn compensator feed reg valve (common), worn check balls (common), torque converter beginning to go out, input speed sensor (this would likely throw a code but not always).

Dealer will plug in diagnostic equipment and drive it to see what the data's saying. My guess is they will either diagnose VB or tell you to rebuild or replace the transmission.