Only 1200 miles on my hummer and i'm gonna have to replace the transfer case module according to the dealers. Here's a few symtoms for other to diagnosis their h3 to see if it's the same issue:
1) Humming noise from front left when traveling over 45 mph
2) A couple of service lights were coming on. such as "4wd need service" and "Stabilitrack needs service"
3) Engine seems a lot weaker than normal H3's
Hope that helps...sucks to know that a vehicle so new already needs servicing.
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