I bought the vehicle in OK and drove cross country to OR. Broke down in WY and the vehicle had very little oil. It burnt oil for about 1.5 years with no leaks. Took it to the dealership and they had no clue why it burns oil. Now it is leaking oil and when I stop at a light or stop sign the oil light comes on and "oil" flashes across the screen and dings. Once I start going again it goes off. The sun roof has leaked and my vehicle has filled with water. I have cleaned the plugs and it helps temporarily and back to square one. I have had the auto shop look at it as well and again no clue why it happens. VERY FRUSTRATING!!!!!

So the first head was replaced at 40000 miles and was covered under ext warrant. no problem but than again at 76000 miles just out of extended warranty the head had to be replace for the second time and of course this time I got to pay for it.

Made numorous calls to GM customer care to no avail the people I talked to didn't even know what a cylinder head was. I got no satisfaction from customer care or the f---ing dealer Arrowhead Cadillac.

Needless to say no more GM vehicles for me.

If someone knows of a class action law suit for faulty heads in Hummers please let me know

This is the third time in 140,000 miles that the valves/head have gone bad. The first time was at about 47,000 miles, the second time was about 99,000 miles, and now again at 140,000 miles. The first thing I noticed was it was running rough/missing when I started it the other morning.The next day the check engine light was on. My husband used a reader and the code is P0300/multiple misfires. The first 2 repairs the car was under a factory warranty and then an extended warranty, but now it is out of warranty.I find it hard to believe that others aren't having the same issues.I so tired of buying American made cars that simply to not hold up and then having to deal with manufacturers that don't feel that they have any obligation to the buyers when their product has an obvious manufacturing defect. I not really sure if I have any recourse, but I doubt it.Are there any permanent fixes out there?

Well, this is a known common problem with this model and year of Hummer. I know GM will not accept any liability to this situation...as they are still owned by Mr. Obama. The dealer says the vehicle needs a new head to the tune of $3544.82 plus tax. What for an updated cylinder head? You have got to be kidding me...

this has to be a joke. Last year the vehicle cost me $2800 for a rebuilt transmission? It was done at an outside shop (not GM affiliated and has a one year warranty.) No, wonder they now call them Government Motors, is it? It seems like a well made vehicle except for this goofy 5 cylinder engine they have in it. Had it to the closest dealer earlier today, wanted antifreeze changed (89,194 miles,) dealer said antifreeze was fine? They did a comprehensive test and a leakdown test on cylinder 2 failed. So, they cleaned the throttle body and sent me home? It says at the bottom: Recommendation: Cylinder Head replacement: $3544.82 plus tax. They have to be dreaming. I only know of one other organization that can legally shake down poor

people like this and get away with it...yup you guessed it...the Government...or was it the Mob? Oh yes, the bill was $87.21 to find this out, which was known by them before.

Thankfully I was covered by the extended warranty, but as many have found, this is an ongoing issue with this model of car. I have been driving this car for 3 years without issue. I went to have some things checked on my car before my warranty was up and found that there was a leak in the valves. The repair would have cost my $3k to fix had I not had the extended warranty. This would have been devastating to me if it were not covered. It is strange that hummer hasn't addressed this issue, as the dealership did mention to me this is a known and frequent issue that tends to happen with these cars.

We purchased the H3 in Feb of 2007. This year we went to have a smog done on it as required in California and the vehicle would not pass smog so we could register it. We took it immediately to the dealer and was told it had a leaky valve problem that needs to be repaired. We had the vhicle repaired and paif for the full repair. It had approximately 52,000 miles on it and was out of warranty. After reserching the problem, it was discovered these vehicles are known to have these problems and GMAC is fully aware of the issues. We contacted GMAC and were reimbursed for $1500.00.for the repair. GMAC refused to refund the amount we paid in it's entirety and we feel this is a breach of trust from GM. They shoudl take repsonsiblity for their products and fess up to the issues. We will pursue the remaider of the funds. This is caused by faulty GM parts and withour part failure, there is no labor. GMAC refuses to acknowedge their responsibilities. We were loyal GM customers and no longer feel they are honest about their vehicles.

Check engine light came on, called Onstar for a diagnostic check, they did not find anything at that time. The light came on again, and I called Onstar while the light was on and a on demand diagnostic check was done immediately. Onstar told me to take it to the dealership to have it checked. I then took vehicle to dealership to have it checked on 2/25/11. The service personnel told me that my vehicle had valves leaking in the cylinder head. Was told by service department that "It is a known fact that 2006 Hummer h3 had problems with leaking valves". I asked why wasn't the customers notified? and why wasn't a recall issued. No definite answers from dealership. I then called GM and asked the same questions. I was told that no recall was issued because this was a parts failure and they had not received a lot of complaints. GM agreed to pay for parts and said that we would have to pay for labor(~$1400). I have called GM several times requesting that they pay the entire amount, since they knew there was a potential problem with valves leaking & never told the customers. The parts were general motor parts, and if it had not been for their parts failing, then there would not have been a problem that requires repairing. I feel they should also pay for a rental car while my vehicle is being repaired, approximately 3 days, due to it being their fault because of their parts failure.