I have a 2019 Tahoe LT with 126500 miles, and about three or four months ago, I had some rough shifting, so I brought it to a mechanic friend of mine, and he changed the fluid(not flush). When he dropped the pan he did notice a lot of particles in the pan, magnet, and filter. When he changed the fluid and filter, that seemed to have fixed the problem. Shifting was smooth, but I experienced minor shuttering when accelerating, usually at higher speeds. Transmission temp was always normal around 190.
Yesterday, I was driving from Houston back home to Louisiana, and I was almost home, and all of a sudden while doing 45 mph, my rpm's went up like it shifted into neutral, and I couldn't get it to move. I was stuck in traffic, but after a little time, I was able to get it to move and drive enough to move it out of traffic onto the side where a tow truck could get me. I recently had a loose battery terminal a few weeks ago (the new battery had a slightly smaller post than the factory terminal connection), and one of the errors on the screen in the middle of all of this yesterday was a critically low battery, so I bet the terminal was loose again. I had just traveled over some rough stretch of road right before this, and maybe it had come loose. I have read that sometimes that could be the case when there's not enough power to control the transmission it won't shift. Even the woman at O'Reilly Auto Parts, when I bought the new terminal cable, said that her husband experienced the same thing where a battery cable was loose, and the transmission wouldn't shift, and once they fixed it, that solved the problem.
This morning I changed the battery terminal to get one that clinched tighter. I started the vehicle and was able to move forward and reverse and then forward again, but when I went to reverse again, it was the same thing with no movement, like I was in neutral. My mechanic thinks we could change the fluid out again to try to get whatever particles were left in there since the magnet was now clean and should catch some of the remaining particles. I'm just reaching out here to see for advice before I have to buy a rebuilt transmission.
Just looking for advice before having to shell out some serious dough.
Yesterday, I was driving from Houston back home to Louisiana, and I was almost home, and all of a sudden while doing 45 mph, my rpm's went up like it shifted into neutral, and I couldn't get it to move. I was stuck in traffic, but after a little time, I was able to get it to move and drive enough to move it out of traffic onto the side where a tow truck could get me. I recently had a loose battery terminal a few weeks ago (the new battery had a slightly smaller post than the factory terminal connection), and one of the errors on the screen in the middle of all of this yesterday was a critically low battery, so I bet the terminal was loose again. I had just traveled over some rough stretch of road right before this, and maybe it had come loose. I have read that sometimes that could be the case when there's not enough power to control the transmission it won't shift. Even the woman at O'Reilly Auto Parts, when I bought the new terminal cable, said that her husband experienced the same thing where a battery cable was loose, and the transmission wouldn't shift, and once they fixed it, that solved the problem.
This morning I changed the battery terminal to get one that clinched tighter. I started the vehicle and was able to move forward and reverse and then forward again, but when I went to reverse again, it was the same thing with no movement, like I was in neutral. My mechanic thinks we could change the fluid out again to try to get whatever particles were left in there since the magnet was now clean and should catch some of the remaining particles. I'm just reaching out here to see for advice before I have to buy a rebuilt transmission.
Just looking for advice before having to shell out some serious dough.
