18th Oct 2014, 03:58

Try Sea Foam in your oil. Can't say it will stop the head gasket leak, but have not blown my H3 yet.

I am having other issues: radiator, coil, sunroof, and now the tranny.

2nd Nov 2014, 10:47

I am having the same issues as everyone else. I have a 2006 Hummer H3. I loved driving the car, but is it worth paying over $5000 to fix? GMC has to pay back. This is ridiculous!! I am in for the class action suit if any.


R. Duran

13th Nov 2014, 23:40

I have a 2006 H3. I love it!!! Bought it used only a couple of months back. Mine has a code showing misfire on #5. I have replaced all plugs and the coil pack on #5. I did this myself, so only had to pay for parts, which still cost right at $40 for 5 plugs, and for the 1 coil pack was right at $60. Now I still have code on #5 misfire and not sure what to do next. I cannot afford to take it to a shop. So I'm open for whatever it takes. Reading these comments, they start over a year ago, so I wonder if anything has been started, or are we just going to vent and that's the end of it?

June.11.1980@gmail.com is my email if needed.

15th Nov 2014, 04:31

Seafoam does seem to help a lot. I inject 5oz into the throttle body with the engine at operating temp for 10 minutes. I do this every 5k miles, and also 5oz in the crankcase. My check engine light very rarely comes on; only when it's very cold outside. I'm in for a lawsuit as well; they recalled the Colorado, which has the same identical motor.


15th Nov 2014, 21:04

I too have an '06 H3 with less than 98K. For me, these issues began a couple of years ago. The list is the same - sunroof leaks, cylinder misfires, check engine light on and off, radiator leak, serious electrical issues, etc... I too changed out a lot of stuff to no avail. Just a matter of time I guess before the heads go. Going to try Seafoam as a temp. fix.

Count me in. dduree08@yahoo.com

17th Nov 2014, 01:49

I too have recently added a nice Hummer H3 to my driveway. 2007 with 98,000 miles on it. I had never owned a GM product so I thought I would try their product. The vehicle looks just as good underneath as it does inside and out, and I really like it, but it recently started throwing the cylinder 5 misfire code. Bought a new coil, plug, and confirmed no water in plug recess hole. Chevrolet dealer will not return my phone calls. Please keep me posted on any actions taken. My email is bbradleycrew@yahoo.com

20th Nov 2014, 04:14


My H3 was just towed in for the same symptoms at 145,000 miles, and I'm now $5,000 put of pocket to get an engine. Not to mention the check engine light and battery light came on and off during summer, due to a misfire that was replaced. Not one time did the check oil light come on, nor did techs find any problem until today when the car wouldn't start. I was told the car needed oil and it wasn't due in for an oil change until 1,000 miles. Count me in for a class action suit.


6th Dec 2014, 09:25

I am so happy I found this page. I wanted to know was it a common issue for Hummers or was it just mine? I have had my 06 H3 Hummer for a couple of years now, and in the first year I got the misfire code. The dealership told me it was water in the cylinder, and then they had trouble fixing it. After finally fixing it, the vehicle ran smooth for another year, and now I am get the misfire code again. I love my vehicle, but cannot afford to pay thousands of dollars every year to fix the engine. If a class action is going to happen, count me in rjhamilton21@gmail.com.

30th Dec 2014, 19:31

Bought my used, new to me H3 in 2012, 42000 miles on it. I'm now going through the transmission issue X 2. Has anyone started a class action, if so contact me: jcrossie712@rocketmail.com

3rd Jan 2015, 14:56

I am the not so proud owner of a babied 2006 Hummer H3. Bought it new and currently have 54k miles on it. The not flashing check engine light has been on and off for the last year. I just paid $572 for cleaning of the induction system and flushing of the fuel injectors, and a promise to repeat the process in a few weeks.

They ultimately believe I need a new head with a cost of about $4000. I would join any serious class action lawsuit. Rich7567@aol.com The real question... does a new head repair fix the problem?

10th Jan 2015, 00:58

I am told my 2006 Hummer H3 needs a valve/head job. #5 cylinder is missing. A tune up did nothing to help the problem. Let me know if there is a class action suit. I can't afford $3,000.00 to fix this. vickiekermelis@gmail.com

10th Jan 2015, 01:27

I too just found out today that my 2006 Hummer H3 needs to have head work done. Took it in last year ($400.00) for the engine light staying on, they replace coil and plugs, but the engine light came back. Now it needs $4500 to $5000 worth of head work. Doing research, this has been a common problem with the H3. Haven't decided what I'm going to do yet.

15th Jan 2015, 02:34

I have an 08 H3 and had some CEL lights coming off and on! Had it checked - it was coil #4 needing replaced. It's been very cold in Ohio, and tonight I noticed some steaming when I parked. Opened the hood and noticed there was what smelled like antifreeze in some spots..... Not looking forward to this issue!!! 88k miles!!! Class action, I'm in fetherolf2012@yahoo.com

19th Jan 2015, 04:19

I have the same cylinder head issues with my 2006 Hummer H3.

Bought this one brand new, and the problems started a couple of years ago.

The dealership told me I have to shell out $3500 for repairs.

I am all in if you decide to file a class action suit.

You can contact me at mdsivila@yahoo.com.

20th Jan 2015, 01:08

Going through the same trouble, I just purchased it recently, wished I could have a chance to read through all this before purchasing the vehicle. I'm up for any law suit. GM should really do something about this!!!


26th Jan 2015, 07:11

Hi, I am in Las Vegas. Can you please send me your lawyer's number and/or case? ID and what city?

Just got the same problem with a Hummer 06, lower than that last 6 VIN number 287591. Need a case to show other suits if possible.

Thanks, Hector at KINGREY69@YAHOO.COM.

26th Jan 2015, 20:35

Is any one of you in Las Vegas? I am going to see a lawyer here. Anyway, send me your emails and the city where you're from to Hector Reyes. E-mail: kingrey69@yahoo.com

2nd Feb 2015, 19:50

Same boat, a babied 2006 Hummer H3 with a bad engine. Thousands of dollars to pass smog. Corissaembro@me.com

4th Feb 2015, 23:55

I have an 07 H3 Hummer and the exact same problem. I would like to join a lawsuit. My info is abdpeace788@aol.com

21st Feb 2015, 20:28

Same problem with my 2006 H3... I just found out that I have no oil in my car - it's not even time for a oil change - they are telling me I might need a new engine...

Email me if anyone's going to start a class action lawsuit.