Transmission in gear, Truck won’t move.

[swathdiver]

I just bought a 2015 Tahoe LT that the transmission went out within 24hrs from buying. It had 132,000 miles on it. Shifted fine test driving, then it croaked the next morning. It's being replaced now.

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Sorry to hear that Nick! Don't let the fluid get past 50K miles on the new one. Consider ditching the transmission's thermostat for longer life. Running them at 195 degrees satisfies the government at the expense of you, the consumer.

 

[nglauer]

Sorry to hear that Nick! Don't let the fluid get past 50K miles on the new one. Consider ditching the transmission's thermostat for longer life. Running them at 195 degrees satisfies the government at the expense of you, the consumer.

I've read on here about the thermostat. I had no idea that was even a thing. Where is it located? I'll definitely do away with that if so.

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[swathdiver]

I've read on here about the thermostat. I had no idea that was even a thing. Where is it located? I'll definitely do away with that if so.

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It's on the side of the transmission where the cooler lines go.

 

[nglauer]

It's on the side of the transmission where the cooler lines go.

Thank you so much for sharing! Really appreciate the help. I can't believe they added a thermostat to the transmission. That is such a weird setup. Was this standard on all models? Is there an actual bypass or is this the only option? Are the trucks setup the same way?

Thanks again!
Nick

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[swathdiver]

Thank you so much for sharing! Really appreciate the help. I can't believe they added a thermostat to the transmission. That is such a weird setup. Was this standard on all models? Is there an actual bypass or is this the only option? Are the trucks setup the same way?

Thanks again!
Nick

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I know this became standard on the new body style for the wagons and pickups, the K2XXs (yours). I would search youtube for other options. Grumpy Bear over at GM-Trucks did something a little different for his. The older body style has the same transmission but does not have this feature, thankfully!

 

[Rocket Man]

It's on the side of the transmission where the cooler lines go.

Why did GM put a damn thermostat on them in the first place?

 

[nglauer]

I would like to add a transmission cooler (assuming mine doesn't have a decent one already). I do plan on towing a boat, utility trailer with my tractor and probably a smaller camper in the future. I wish I had taken a picture of the RPO code sticker before I left it at the dealer.

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[swathdiver]

Why did GM put a damn thermostat on them in the first place?

So they would heat up quickly and be more fuel efficient.

 

[Rocket Man]

So they would heat up quickly and be more fuel efficient.

What a load of crap. Wonder if it even makes a noticeable difference.

 

[swathdiver]

What a load of crap. Wonder if it even makes a noticeable difference.

Probably only in the eyes of the government inspector when they are doing CAFE calculations. But in the real world, we see that it shortens transmission life. The 6-speeds in the 900s last longer than in the K2s it seems.

 

[Tiredmechanic23]

I would like to add a transmission cooler (assuming mine doesn't have a decent one already). I do plan on towing a boat, utility trailer with my tractor and probably a smaller camper in the future. I wish I had taken a picture of the RPO code sticker before I left it at the dealer.

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Id bypass the thermostat only first and see how your temps do then think about a cooler. With the thermostat in place the cooler does not even come in to play until after the thermostat set temp which is 180 or 190 I cant remember.

 

[nglauer]

I finally got my Tahoe back last night. I had it for less than 50 miles and 2 hours before all hell broke lose. Apparently they forgot to put one of the retaining clips on the cooler line (side of transmission thermostat. It managed to stay in until I was roughly an 1/8th mile from my house. When it popped it was able to pump out just shy of 8qts of fluid. Luckily I caught it as soon as I rolled into the driveway and noticed smoke lighting up under my garage light.

Long story short. Dealer felt horrible and immediately ordered 8qts of fluid and a retaining clip from the nearest parts store for me (at my request vs waiting on them to fix it). I went and picked it up and fixed it myself. So far so good. I logged another 20-30 miles to make sure it was shifting fine. Now I just need to degrease the underside and get it cleaned back up.

Hopefully there was no damage caused, but with it happening so close to home (literally measured the oil trail) I think it should be okay.

Nick

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[Rocket Man]

I finally got my Tahoe back last night. I had it for less than 50 miles and 2 hours before all hell broke lose. Apparently they forgot to put one of the retaining clips on the cooler line (side of transmission thermostat. It managed to stay in until I was roughly an 1/8th mile from my house. When it popped it was able to pump out just shy of 8qts of fluid. Luckily I caught it as soon as I rolled into the driveway and noticed smoke lighting up under my garage light.

Long story short. Dealer felt horrible and immediately ordered 8qts of fluid and a retaining clip from the nearest parts store for me (at my request vs waiting on them to fix it). I went and picked it up and fixed it myself. So far so good. I logged another 20-30 miles to make sure it was shifting fine. Now I just need to degrease the underside and get it cleaned back up.

Hopefully there was no damage caused, but with it happening so close to home (literally measured the oil trail) I think it should be okay.

Nick

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I had the same thing happen to me on a freeway off-ramp. I had replaced my transmission and apparently didn’t get a cooler line pushed all the way in. I filled it up and didn’t have any issues. Hopefully you’ll be fine too.

 

[nglauer]

I had the same thing happen to me on a freeway off-ramp. I had replaced my transmission and apparently didn’t get a cooler line pushed all the way in. I filled it up and didn’t have any issues. Hopefully you’ll be fine too.

I'm hoping it'll be fine. If not, I added an extended warranty. Hopefully I won't need to use it twice

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[Rocket Man]

I'm hoping it'll be fine. If not, I added an extended warranty. Hopefully I won't need to use it twice

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It’s their fault if something happened to it, don’t let them say it’s your fault.

 

[nglauer]

It’s their fault if something happened to it, don’t let them say it’s your fault.

They took full blame. However, If there are any issues that crop up miles from now... I doubt they'll do much of anything. I would most likely take it somewhere else for work anyways. Although my preference is to do all my own work, I just doubt that the extended warranty company will allow me to service it myself.

Nick

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[89Suburban]

That's ****** up Nick!!! I'm sorry this happened you good people. Hopefully will be ok!

 

[nglauer]

That's ****** up Nick!!! I'm sorry this happened you good people. Hopefully will be ok!

Appreciate it. I'm just glad I have it back and it's running. I knew with high mileage I was taking a gamble. I just figured it would be worth it since it'll be a work vehicle. I couldn't justify spending another 10-15k for a lower mileage one then taking it on the roads ok be taking this one.

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