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Maybe check the transmission fluid levels? COnsider a tranny flush?If it has not been driven alot, then it may need some "driving". I let one of my Camaros sit for 2 years, then when I went to drive it, the auto tranny didn't shift right for the first little while, butafter a day all was right again.
Ditto with first checking the condition and level of the transmission fluid. If that doesn't 'fix' the problem, then I too would suggest taking your H2 in to a GM dealer...if your have one nearby within your country.I'm unsure if this is related, but I had experienced the same thing with an older Ford 'Ranger XLT' a couple of years ago. I'm unsure about the newer vehicles with computer controlled 'this and that', but the Ford's 'no fourth gear' problemwas later deemed to be a defectiveoverdrive module. Afterit was replaced, the 'tranny' shifted fine and just like it did when the truck was new. [sm=gears.gif]
"The only place where success comes before work is in the dictionary."
check fluid change the filter and also make sure you flush out the lines.If there is alot of metal in the pan its done.If not and fluid is so so check your 2-3 and 3-4 shift solonoids.Easy to change when the pan is down and cheap "Under 100 USD for both"
Common problem for my limos and i keep a set on hand just for that reason.