Just wanted to say I have returned to the complete and utter love of this truck. Hummer H2 Black on Black. After going Absolutely ape **** on the dealer and eventually calling and email corporate enough times that they just wanted to shut me up this is what happened.

Total Cost to Me ($5100)

1- Ordered Brand New After market transmission from Mad Dog heard mixed reviews but went with there stage 3 but lets factory glide shifting so that it was nice and smooth

2- Dealership after ****ing up sooo badly ended up doing the following
-Installing Transmission Incorrectly
-Sending Transmission back to have it replaced
-Installing Transmission Correctly
-Installing New Radiator with aftermarket transmission cooler and ALL lines replaced
-Install new Thermostat Gauge
-Installing Complete Pedal Assembly Inside the Truck
-Removing 4 Broken Bolts from the exhaust manifold and replacing them all including new exhaust manifolds and gaskets.

The truck went back and forth for 8 months include me towing the truck 7 times after the dealership gave it back and assured me it was good to go. They refused to issue me any sort of refund BUT they did a ton of work at no cost to me. All and all not the best way to use my hummer but hes a ****ING BEAST now.

 

That sounds like you went through absolute hell but i'm glad they made it right in the end.

 

Do you know the exact issue that caused the "reduced power mode"? I'm 99% sure I have the same issue. I have to shut he truck off and restart it one or two times then its perfectly fine. (with the check engine light on.)

 

You realize that "Hummer mechanics" are just regular GM mechanics right?
I mean the LQ and the 4L are the same engine and trans in many of Chevy/GMC vehicles.

As for a "true" Hummer mechanic, since there arent any Hummers being made anymore, I would say that there arent any dealerships anymore and so that would probably mean that there arent any (or as many) factory trained specialized mechanics...
So the only way to get a real Hummer mechanic is if they happen to work at a specialty shop that deals with just Hummers (and thats probably pretty slim) ....
But, most likely what we probably have available to us is a mechanic who happens to know a little more about the gremlins of the Hummer then the average wrench turner.

With all that being said, I think installing a factory engine or trans isnt a Hummer specific job... like I said because it is something that is common in every truck or Ute out there.

- Of course the mechanic that put the OPs tranny in with the lines all messed up and not checking the trans/cooler setup is an idiot and like it was said shouldnt be working on any car, let alone a Hummer

 

I think the idea there aren't any real hummers mechanics is a farce. Having had more than 20k worth of work done to my rig in the past 4 years I finally gave the finger to the certified service center off lemon in downtown dallas and decided to take a leap of faith and try another shop and hour out of my way in grapevine. It was a former Hummer Certified service center. The difference between them was night and day. When I described my issues they didn't act like I was speaking swahili and would need to wait to relay what I was saying to the translator that would be in later that day it was like old hat for them they fixed it and I didn't have to turn around the next day for something else that mysteriously would pop up when I have dropped it off at sewell. I had an obscure issue with a aftermarket license plate holder light harness because of my tire carrier I had given up on as a routine maintenance item while they were addressing something else they called me and let me know about the license plate light asked me if I wanted them to fix it I was surprised and said sure. Sewell had told me there wasn't anything that could be done about it and I should look on the internet after having sold me the wrong license plate holder and harness for the OEM tire carrier and me finding out it wouldn't fit. I had been replacing them every 6 months and I'm now about 9 months into the light they put on in grapevine and it shows no signs of damage from any of the car washes I've been in. Little stuff like that makes a big difference in the experience of owning your hummer if you aren't going to be turning the wrench on your own rig. I'm getting ready to drop about another 5k on various items and you can bet when I got for the 4L80E tranny and cooler upgrade I will go to the real hummer mechanics. I think it is worth it to find the techs in your area that have experience with hummers I only wish I had done it sooner.

 

In my experience, dealerships are more expensive than small shops, but well worth it. The exception is if you are dealing with customized stuff. Engine swaps, big lifts, etc.

Even though Hummer dealerships are gone, you can still find certified Hummer mechanics working at GM dealerships. Honestly though, at this point I'd say if you can find a Chevy/Caddy/GMC dealership that does good work you should be fine.

My '06 is in the shop right now getting some stuff fixed including tranny cooler lines and broken exhaust manifold bolts (forgot about the bolts in my other thread).

 

What part of CT you in? ----Just so I don't take mine there.
MikeH