08 BUICK ENCLAVE NORMALLY DOWNSHIFTS AND UPSHIFTS ALL THE WAY UP A HILL. TOOK IN THREE TIMES AND THEY SAID EVERYTHING CHECKS OUT NORMAL, JUST DRIVE IT. THEN DRIVING OUT TO ARIZONA, IT STARTED OUT DOWNSHIFTING AT THE START OF A HILL AND UPSHIFTING AT THE TOP OF THE HILL LIKE A NORMAL CAR. THEN ONCE EVERY FIVE TO TEN HILLS IT WOULD NOT UPSHIFT AT THE TOP OF THE HILL UNTIL I SHUT OFF THE CRUISE CONTROL. ONCE I WENT FIVE MILES DOWNHILL BEFORE I SHUT OFF THE CRUISE AND IT UPSHIFTED. I TOOK IT IN TO THE DEALER, BUT THE FEW MILES THEY DROVE IT, THEY COULD NOT MAKE IT HAPPEN. THEY SAID THERE WERE NO CODES SO THERE WAS NOTHING THEY COULD DO, SO JUST DRIVE IT LIKE IT IS, AS ITS STILL UNDER WARRANTY. IT HAD ALSO HAPPENED ONLY ONCE BEFORE WHEN IT WAS NEW,BUT THEY COULD NOT FIND ANYTHING EITHER. I DON'T KNOW IF THIS IS CONNECTED OR NOT, BUT IF I WANT TO ACCELERATE SLOWLY,I HAVE TO PUSH THE GAS PEDAL DOWN FARTHER AND THEN BACK OFF QUICKLY TO NOT ACCELERATE TOO FAST. I SURE HOPE THEY CAN COME UP WITH A FIX FOR THIS PROBLEM. *TR
