really awful
Typical Repair Cost:
Average Mileage:
117,000 miles
Total Complaints:
3 complaints

Most Common Solutions:

  1. replace engine (2 reports)
  2. not sure (1 reports)
2008 Hummer H3 engine problems

engine problem

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2008 Hummer H3 Owner Comments

problem #3

Mar 142020

H3 3.7L

  • Automatic transmission
  • 189,000 miles


I had just had an oil change done because it consumed so much oil. I did the change on a regular basis and also had to keep adding oil a week after my last oil change because the engine started running rough and knocking.

- Robert G., Mamou, US

problem #2

Oct 052015


  • Automatic transmission
  • 95,000 miles

click to see larger images


Car was shaking, loss of power, could drive it over 15 miles per hour, Shut it off and turned it back on and it was fine. Took it to my mechanic and he couldn't find anything wrong with it.

Update from Nov 18, 2015: Mileage is 99698

Update from Nov 18, 2015: I video taped the car while it was shaking but I can't seem to upload it. I will keep trying.

Update from Nov 18, 2015: This the second time this problem has occurred. Finally, the problem is constant and mechanic was able to see the problem. The first time it happened they couldn't find anything wrong. Car is with my mechanic. Hopefully, it will be fixed and I can update this complaint with good news for the rest of you who experiencing the same problem.

- Graciela G., Chino, CA, US

problem #1

May 042015

H3 5

  • Manual transmission
  • 67,000 miles

My 2008 H3 67,000 miles started with engine light on a month ago. It went off. Noticed rough ride and hesitant to pick speed up. Light went off came back on took misfire 2. Replaced Coil, spark plug, did compression test low pressure, smoke coming out, replaced injectors. Still showing misfire 2. Shop stating seen carbon inside some part and need new engine, valves not leaking.

I called Hummer and all they said was take to GMC. They charge too much and I already have done all this at my mechanic. Any ideas, help? No warranty left, cannot afford to buy a new engine. Mechanic states if they send to machine shop and fix screws or springs down inside a temp fix? Is there a class action lawsuit on these defective engines from GMC

- Jackie T., Temple City, CA, US

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