Cylinder Head Failure

2006 Hummer H3

This problem may be covered under warranty. Ask your Hummer dealer.


really awful
Typical Repair Cost:
Average Mileage:
77,600 miles
Total Complaints:
4 complaints

Most Common Solutions:

  1. replace cylinder head (3 reports)
  2. replace head (1 reports)
2006 Hummer H3 engine problems

engine problem

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 2006 Hummer H3:

Unsubscribe any time. We don't sell/share your email.

2006 Hummer H3 Owner Comments

problem #4

Mar 252016


  • Manual transmission
  • 69,950 miles


I just have to say GM really needs to listen to its buyers. We are not happy, and most likely will buy elsewhere. Just this past week, for the second time, the head cylinder needs replacing. The first time it was under warranty, the second time, well, I simply can't afford the $2900+ to have it fixed. It's a shame that this a known issue and you can find tons of bulletin boards where people are complaining, yet, if you contact GM, you basically get the cold shoulder and "we will be more than happy to help locate you a dealer", but, "we are not paying". Its sad because I really do love my H3, and with under 70k miles and excellent care, this should not happen. For now, it will sit in my driveway until I come up with a solution. Maybe another engine? Maybe GM will eventually help? Let's see.

- Ryan B., Deerfield Beach, FL, US

problem #3

Oct 012014

H3 3.5L

  • Automatic transmission
  • 63,380 miles

My engine light is on and I took it to the dealership and I need a new cylinder head. I have a code P0305 (engine misfire). I have lodged a complaint with GM Canada and was told my warranty has expired and have been turned down twice. It is a known problem but because I have low mileage it did not happen until my warranty had expired. I am a first time owner and the vehicle has been very well maintained. I am furious with the dealer as they know this is a common problem and that it will eventually happen. I am being punished because I did not rack up the miles and it happened too late, according to their warranty problem.

- maxineh, Richmond, BC, canada

problem #2

Jan 222014

H3 Adventure 3.5L I5

  • Automatic transmission
  • 113,000 miles

I believe regardless of the mileage, warranty or not, the manufacturer is aware of the pitiful cylinder heads they installed in the 2006 model. Responsibility should be placed on the manufacturer. I read too many reviews of the 2006 Hummer H3 owners having to spend $2,000-3,000 hard earned dollars for repairs that could have been prevented if the manufacturer would take full responsibility and recall the bad heads

- mcg30stjude, Southaven, MS, US

problem #1

Aug 132011

H3 5 cyl

  • Automatic transmission
  • 64,000 miles

Not even a week after purchasing my 2006 hummer h3 from local Chevrolet dealer a cylinder head went out and luckily because it happened in a 30 day period they coverd the almost $2500 bill. I have now owned it 17 months and its the worst car ive ever owned i wouldnt recomment to anyone! Tons of problems.

- Tracy T., Rossville, GA, US

Not what you are looking for?