15th Jun 2014, 18:47

Hello Everyone,

Add me to this long list of folks with H3 problems... my daughter and I were on our way back to Texas from a mission trip in Shiprock NM on Friday night, and got stranded for 5 hours in a remote area of New Mexico ~100 miles from Albuquerque in the middle of the night! Yesterday, after having it towed to an Albuquerque Chevrolet dealership, the initial diagnosis is a new engine is "probably" needed. However, they need to physically remove parts of the engine to fully diagnose and it will cost ~$700 for them to do the work next week (not enough time to complete on Saturday). Needless to say, I am now spending $700 to get the car transported to Dallas to allow my mechanic to diagnose and repair the car.

Symptoms appear similar to other reports of head problems found on the Hummer Forum and other websites. The H3 was losing power while going up hills, check engine light came on, started making noises and then finally died in a very remote area of New Mexico. Have had this car since new in 2006 and it has 134k miles. I cannot believe that the engine may have to be replaced at 134k miles!

Pending final diagnosis, would be interested in joining a lawsuit and can be reached at wpjac2014@gmail.com.

17th Jun 2014, 21:40

I bought my 06 Hummer H3 1 year ago with 55k. About 2 months ago I got the rough idle and was told by a certified mechanic that #1 cylinder was bad. So I drove it home and parked it. After calling GM and getting nowhere, I decided to get a second opinion from another garage. On the drive there, guess what, the transmission goes. The vehicle has 73k and needs a new motor and transmission. Where's the class action lawsuit?

1st Jul 2014, 00:20

Also have an H3 2006. The engine light keeps coming on, and the mystery is to see if it is what everyone is discussing here. Has anyone started a class action against them? Also, with all the GM cars recalled lately, why isn't this going to be taken care of?

2nd Jul 2014, 20:51

My family members have owned both the H-2 and H-3 Hummers.

Unless one drives off road a lot, I see no purpose whatsoever in the H-2. It has zero performance, horrible handling and 5-mile-per-gallon fuel economy.

As for the H-3, it was a gussied-up Chevy S-10 with ten grand tacked onto the price and half the fuel mileage. Those family members now drive far more sane large trucks (one Chevy Avalanche and one Ford F-150). GM made the right decision in dropping Hummer.

8th Jul 2014, 05:23

I have a 2006 H3. It has about 113,000 miles on it. It is starting to throw misfire error codes on #4 cylinder. I have a feeling it is a blown cylinder head. Please contact me if a class action lawsuit is started. Jpickard4@centurylink.net. Thanks!

10th Jul 2014, 01:27

Same problems here. Almost done paying off my 06 H3 and now the excitement is gone. My Hummer has been overheating and leaking coolant. I am waiting on a diagnostic, but it does sound like it is a problem with the gasket or the cooling system. Class action I agree. Please contact me as well thanks. imisjpeaces@gmail.com

20th Jul 2014, 16:31

Hello, I have recently purchased a 2006 H3 Hummer in June. I drove it off the lot and the check engine light came on after 25 miles. I took back to dealership after inspection; the head needs to be replaced. I'm currently fighting with the warranty company to repair it. They will not pay for repairs. If there is a class action suit, count me in. My e-mail is jssanti@att.com thank you. If we all come together, we can get this issue taken care of.

31st Jul 2014, 02:38

I have a 2007 H3 and have so far replaced the radiator due to a stress crack on top of it at 60,000 miles.

The heater blower motor wiring harness needs to be replaced after it stopped working.

Now the check engine light has come on.

Please add me to the list. Contact me at ccsd836@gmail.com

8th Aug 2014, 07:18

Also have an 06 H3 with all the same problems as everyone else. Having rough idle and misfire issues; dreading the head issue. Already replaced the radiator issue and had an episode when the H3 just stalled out, shut off, and went into a coast at 60 miles an hour on way to work. When this took place, I had no steering AT ALL. The engine light has been on since. Count me in on a class action suit. Please update me at feelinhurtur@hotmail.com.

2nd Sep 2014, 04:49

I was seriously looking at Hummer 3 2006 to buy (looks great). The V6 drives nice... but not after reading these issues.

I am glad for sites like this. And that I found it before purchasing.

7th Sep 2014, 15:30

I have an H-3 2006 year model and have the issues with oil pressure going away at idle and having the misfire issues. 82,000 miles on this one and I have replaced the ECM twice, throttle body, fan clutch, t-stat, oil pressure sensor, coils, plugs and so on. My email is mcneeleytom@yahoo.com.

24th Sep 2014, 23:08

My 2006 H3 has had all of the EXACT same problems... cylinder heads replaced, 3 coils, spark plugs, coolant issues/smells... all amounting to over 6000 dollars in the last 18 months.

I absolutely love driving this vehicle, but being a frequent flyer at the dealer is getting old... Especially when it is all related to a manufacturer defect. What can we do guys? As a consumer and Hummer lover... It's an unfortunate issue that I believe GMC should resolve. Please email me with action info: seamsler@gmail.com. Thanks!

8th Oct 2014, 00:36

We have the same thing. How do we join the suit?

Thanks, Tom. Email ammf0896@yahoo.com

9th Oct 2014, 13:28

I have a 2006 Hummer H3 with 90k miles on it. Only had to replace the radiator and thermostat 5000 miles ago. Is there anything I can do to prevent costly damage? Should I replace the head gasket before it goes bad?


13th Oct 2014, 18:14

I've had the same problem. Just purchased an 06 Hummer H3 used. The engine started shutting off randomly just two days after purchase. Told the dealership I bought it from, and was told "that's strange, take it to a dealership". It would always start again fine after I waited a few minutes.

Well this last time it never started. Was quoted $3,000 for a "valve job" and a "possible" cracked head, which is causing low cylinder compression in one of cylinders, causing it not to start. That in combination with the anti theft device cause the engine to lock out. When the lockout resets, all you get is a crank? The Hummer has been sitting in my driveway for the last 20 days, waiting for dealer to get to the "bottom of it, as he thinks it's possibly a GPS anti theft tracking issue.

18th Oct 2014, 03:52

H3 2005-2006, purchased new.

Have had problems with the radiator. Replaced it at 85,000 miles, and now there's a large knock noise when shifting from park to drive. It seems it is a front differential problem.

At 98,000 miles, also replaced the coil.

Going to the shop soon. The sunroof has always leaked after many repairs. Called GM many times, and always get the BS.

I use some Sea Foam in all my cars' oil; this may help some before you blow a head gasket.

But hey, I am up for a lawsuit, apfire010@yahoo.com