2007 Hummer H3 3.5
44,000 miles, the check engine light came on. Took it to the dealer. I had a cylinder 5 misfire (code P0300). A couple thousand miles later my truck was still showing multiple misfires.
I had to replace the radiator (because it was leaking) and thermostat at 46,000.
April 2011 at 65,000 miles, my transmission went out completely and had to be replaced.
July 2012, the air stopped working. Took to the dealer; they said I had to replace the fan blower motor resistor. Researched and founded this was a known problem for Hummers; the motor gets too hot and melts, causing the fan blower to go out.
Several months later, the check engine light came on several more times. Took it to the dealer; they said they couldn't find a problem and cleared the code. My check engine light came on again so I took it to Auto Zone. Their diagnostic showed cylinder 5 coil multiple misfire, so I had the spark plugs changed along with all five ignition coils.
A couple of months later, the check engine light came on again. Took it to the dealer; the diagnostic test revealed code P0300 again and a couple of other codes. The dealer said my truck had an emissions leak, multiple misfires, cylinder 5 and a small crack in the head. I didn't understand how that magically happened. I paid the dealer to fix this in March 2014.
A week later the check engine light came on again. Took it to the dealer; the diagnostic showed an emissions leak; apparently they didn't fix it the first time.
A week later the check engine light came on again. Took it to the dealer and the diagnostic test revealed torque converter clutch solenoid. The dealer said I need the transmission replaced. I'm confused at this point; the dealer put in a new transmission 3 years prior. My truck has never been over the road. I only drive locally. Now at 103,000 miles the dealer is saying I need another transmission. Something is not right here.
After researching, I've found thousand of Hummer owners experiencing the same problems I've experienced. I've found bulletins from GM on the coil, engine and torque convertor problems caused by GM. Something needs to be done to protect us consumers against repeated repairs because of GM's poor craftsmanship.
I advise everyone that has had or is having problems with their Hummer to go file a complaint at http://www.safercar.gov/Vehicle+Owners/. The more people they see with the same issues, the more the government can make GM do something about it.
Would you buy another car from this manufacturer? No
Review Date: 20th April, 2014