Transmission issues 2014 Tahoe LT

[iboughtatahoe23]

I financed a Tahoe. And I was loving it the first few days. But now I’m noticing what feels like prolonged shifting at low speeds and it shifts funny while just cruising, it will rev high at like 2k and finally shift just cruising at like 35mph. And it’s like the gears don’t have time to catch up with each other when I have to get on it. (At a stop light per day.)

Codes I got:
C0300 for rear propshaft sensor
C0700 “unknown engine code” I’m thinking it’s the TCM?

 

[Doubeleive]

you could check the transmission harness and see if any pins are not in all the way, there was or is a tsb on it on google, other than that not sure
if you google for the tsb there are photo's of what to look for at the harness

 

[iboughtatahoe23]

you could check the transmission harness and see if any pins are not in all the way, there was or is a tsb on it on google, other than that not sure
if you google for the tsb there are photo's of what to look for at the harness

Where is the harness located again? I couldn’t find an exact photo.

 

[Doubeleive]

Where is the harness located again? I couldn’t find an exact photo.

your codes do not seem to be related but figured it might be worth a shot

https://static.nhtsa.gov/odi/tsbs/2012/SB-10043829-6448.pdf

 

[Foggy]

Thanks Doubeleive
Thats a nice link for all sorts of stuff

 

[iboughtatahoe23]

your codes do not seem to be related but figured it might be worth a shot

https://static.nhtsa.gov/odi/tsbs/2012/SB-10043829-6448.pdf

I should get under there and unplug that and clean it then?

 

[Doubeleive]

I should get under there and unplug that and clean it then?

probably couldn't hurt to do that and take a good look all around and see if any wires or harness have been rubbing on anything or made contact with the exhaust, etc.

 

[iboughtatahoe23]

probably couldn't hurt to do that and take a good look all around and see if any wires or harness have been rubbing on anything or made contact with the exhaust, etc.

Drove around doordashing today. It was pretty consistent after warming up. Few light jerks it felt like here and there or “jumping” the ride doesn’t feel as smooth as the first day I drove it. And I feel like I’m bogging sometimes. Like if I’m cruising in 3rd gear per se,and I need to speed up, and I could be wrong. I feel like it should drop down into 2nd to speed up more? But it doesn’t. I just bog in 3rd gear until I need to get to my speed.