Sounds like you got the ultimate lemon[:'(]. My advice would be to thoroughly document everything that's happened, what you've done, and what the dealership has done (include names of everyone you've dealt with). Include dates and times of occurences and how much time you've been without the vehicle. This will be invaluable info if you have to go the lemon law route.

Good luck!

 

I have had mine done twice by my dealer and of cource I am the only one having this problem. His fix was 3-M tape.

 

I have not had a single problem with my LTZ I have now had it for 3 months!

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I bought a 2007 LTZ the end of May. Every option but 4WD. Took a trip from Southern California to Vegas about the first of July. About 2000 miles on the clock. Got about 60 miles out of Vegas (temp about 115 degrees) and the cruise control kicked off, the tach zeroed with the engine running fine, the "service stabilitrak", "service traction control", and "service engine" lights illuminated. In addition to this, the A/C completely quit blowing any of it's usual semi-cold air. (The A/C has never quite put out icy cold air like it should, though. It has always had to be set all the way down to 60 degrees to do even a "fair" job of cooling). We pulled over, visually checked the engine, and it looked OK. Called OnStar to report it, they weren't of much help. The temp gauge, oil pressure, and battery/volt gauges were all OK. Turned the engine off for a few minutes. Started it up again and all was fine. Took it to the Vegas dealer and they reprogrammed the drive train computer and did a re-learn on the crank sensor. Picked it up and all seemed cool (a pun, as the performance of the A/C still sucked as before). We left Vegas and got to Victorville (300 mi. and 111 degrees) and it did the exact same thing again. Called OnStar again so they could archive the prob. Turned engine off for a few, restarted and were good to go again. Really screwed up our plans to drive up the coast, though. Headed back home to central Cal earlier than expected as we didn't trust the thing at all now. About 300 miles later, almost home (106 degrees) did the same bad act again. Took it to a local dealer near our home. Eight days later...they said they R/Rd the trans PROM, R/Rd and re-learned the crank sensor, Reprogrammed the Drive Train PROM, and did one of two reprogramming fixes from a TSB about the A/C. (G.M. doesn't have the second fix figured out yet, so I don't even know what that is.) FYI, I also had the left rear door lower glass reveal mlg that flops in the breeze, and they replaced that. The vehicle seems to be OK (exept the anemic air conditioning), but I haven't taken a long trip in the heat again yet. I really, really, really LOVE this vehicle. It's like a wife gone bad...can I trust it again? 50Gs is a lot of bux for a vehicle that can't be counted on. I hope I'm eventually proven wrong.

 

After reading the engine problems twice in this particular post and experiencing it myself, I will give my input. My wife, daughter and I piled into our newly owned '07 (less than 2 week old) and headed from Dallas up to Seattle. (Yes we are crazy) After 8 hours on the road, we also experienced the "thump" feeling with the "Service Stabilitrak and Service Traction Control" lights and messages on, RPM's dropped to zero, and the air off. We continued on while calling OnStar which helped locate a dealer thankfully only 10 mile up the road in Hays, Kansas. Now, we bought the truck as a demo with just under 6k miles and you would think that problems would be worked out but after reading that our problem has been experienced with others, I am beginning to think this is a problem only duplicate-able during long periods of highway driving and high heat. After spending 4 1/2 hours at the dealer waiting, they couldn't tell us what the problem was or duplicate the problem. So, on our way we went and sure enough, it happened again. Fortunately, we found out that if we pulled over, turned the truck off, pulled out the key, opened the door, closed the door, locked the truck, waited for a minute, unlock the truck, and start it up again, all the systems and lights reset themselves and we were on our way. This happened to us twice each day we were on the road doing highway driving longer than 3 hours. At first we thought it had something to do with the cruise control so we stopped using the cruise. After trying to get a dealer in Reno to take a look at it, (which they didn't have time to fit it in) we drove home, unloaded everything out, took it right up to the dealer and dropped it off. After 2 days of working on it, they replaced some sensors and wiring. I don't have the specifics here at work but if anyone would like them, just contact me. We are taking another trip in October down to El Paso - 10 hour drive - and I am praying the same thing doesn't happen.

 

GM is looking hard into this concern and should have a published fix for this soon, the problem is suspected to be in the TFP switch (transmission fluid pressure switch).
It appears as though some of the earlier builds may have had switches supplied that were not up to spec, so far there has been fewer than 40 cases of this reported nationwide.

Most dealers will replace the TFP switch under the direction of GM TechLink and the problem should be solved.

 

Holy crap you guys are scaring me! I just bought an 07 LS on Friday. I have only 2 mechanical concerns. Shaking over 60 mph (I am sure due to my 20's not balanced properly) and the molding across the top of the driver door pops off when the window is rolled up. My dealership is handling it (ordered a new molding site unseen) but now I am scared as hell about these issues you guys are describing.

 

I got my 07 tahoe on 8.6.6. I also have a problem with the molding on the left passenger door. I took it to the dealer thinking it justed needed glue or 3m tape. The service advisor told me it had to be replaced. Other than that I haven't had any other problems and I have been very happy with it so far. Keep in mind I have only owned it for 10 days. Honeymoon ain't over yet!! I hope it doesn't end in divorce.

 

I wouldn't be scared about the problem I faced. As I explained to my wife when it happened (her truck) as she was cursing left and right saying it was a POS, it is a brand new vehicle and it might have some problems. Imagine how much the new Tahoe's are controlled by the computer system compared to previous models. I will have to bring in my service write up and post what was replaced on mine. I will have the truck tomorrow and will bring in the paperwork and post it here. We have not had a problem since we had it fixed, however we haven't taken a long trip to test it either. I am just glad it doesn't disable the truck completely - that would have left us stranded in 100+ degree heat in the middle of nowhere!

Also, the side modling on the rear window was also a problem of ours as well. At first, they put 3M tape and that lasted 2 days in the Texas heat and then got a message from the service department stating the new part was in. Was replaced and haven't had a problem with it since - 1 month later.

 

Hey, Texas...

It looks like we have trucks built on the same Friday afternoon (lol). Our problems are identical, the shutting down in the heat and our wives ranting and calling the truck a P-O-S, etc. Maybe the trans switch will cure our ills. I'm not taking mine in for a couple of weeks. I just drove to Sacramento yesterday (only about 90 miles) but it wasn't hot out either, so it behaved itself.

Good luck with your prob, let us know if you get a sure fix on it, I'll do the same.