2009 GMC Yukon Powertrain & Transmission Problems

The contact owns a 2009 GMC Yukon Denali XL. The contact stated while depressing the accelerator pedal, the vehicle experienced delayed acceleration. The contact stated that the check engine warning light was illuminated. The vehicle was taken to a local mechanic but was not diagnosed or repaired. The manufacturer was informed of the failure and informed the contact that they were unable to assist. The failure mileage was approximately 90,000.

WELL THE CHECK ENGINE LIGHT CAME ON THEN THE OIL LIGHT CAME ON I CHANGE THE OIL IS STILL ON THE BATTERY KEEPS DYING I'VE ALREADY BOUGHT THREE NEW BATTERIES NOTHING IS WORKING I'LL STILL COME OUT THE CAR IS DEAD CHECK ENGINE LIGHT KEEPS POPPING ON AND OFF THE WHEEL THE WHEEL THING KEEPS POPPING IN AND OFF I BOUGHT NEW TIRES IT'S STILL POPPING ON AND OFF I JUST DON'T KNOW WHAT'S WRONG

TRANSMISSION DIPSTICK TUBE BROKEN. NOT SURE WHEN IT HAPPENED. IT WAS NOTICED BY MY FATHER ABOUT A WEEK AGO WHEN HE WAS LOOKING THINGS OVER. I JUST GOT THE TRUCK USED FROM A DEALER IN SEPT.

I PLACED THE VEHICLE IN PARK ON A LEVEL SURFACE, I LEFT THE YUKON RUNNING AND I GOT OUT AND WALKED MY GREAT NIECE TO A BUILDING ABOUT 30 FEET FROM THE VEHICLE.. I THEN TURNED TO SEE THE YUKON BACKING UP ON THIS FLAT SURFACE, I RAN TO TRY AND CATCH IT BUT IT HIT A BUILDING AND THEN CAME FORWARD AT ME. I HAD TO JUMP OUT OF IT'S WAY AND THEN CHASE IT DOWN. WHEN I JUMPED IN AND HIT THE BRAKE I THEN NOTICED IT WAS IN M1. I TOOK IT TO A LOCAL GMC DEALER WHO CHECKED THE TRANSMISSION BUT REPORTED FINDING NOTHING. I AM NOW AFRAID OF THIS CAR. HOW DO YOU KNOW WHEN IT WILL VIBRATE OR JUMP FROM PARK TO REVERSE AGAIN. THIS NEEDS CHECKING INTO. THIS YUKON WENT BOTH BACKWARD & FORWARD. *TR

2009 YUKON XL HAS DIED 3 TIMES WHILE DRIVING. ONCE WAS IN REVERSE. THERE IS NO WARNING. I'VE TAKEN IT TO THE DEALERSHIP, THEY COULDN'T "REPRODUCE" THE PROBLEM SO NOTHING WRONG WAS DETERMINED. THE ONLY THING THAT QUITS IS THE ENGINE (WHICH TAKES OUT THE POWER STEERING SO I CANNOT CONTROL THE TRUCK FOR LONG AND NOT AT ALL IN A TURN); THE AIR AND RADIO/DVD PLAYER STAY ON, THE LIGHTS (IN - ON DASHBOARD AND OUTSIDE) STAY ON AND NO CHECK ENGINE LIGHT OR ANY LIGHT THAT SHOWS A PROBLEM COMES ON. THE FIRST OCCURRENCE WAS IN AUGUST OF 2010, I WAS IN MID TURN, WITH MY 4 CHILDREN IN THE TRUCK WHEN I SUDDENLY COULDN'T COMPLETE THE TURN. IT DIED IN THE MIDDLE OF THE STREET. I COULDN'T TURN THE WHEEL OR APPLY PRESSURE TO THE BRAKE. I PUT IT IN PARK, TURNED THE KEY TO OFF, REMOVED THE KEY, REPLACED IT AND RESTARTED THE ENGINE (WHICH STARTED IMMEDIATELY). ONSTAR COULDN'T DETECT ANYTHING AND THE DEALERSHIP COULDN'T GET IT TO "REPRODUCE" SO NOTHING WAS FIXED. IN THE PAST SEVERAL WEEKS (JULY/AUGUST 2011) IT HAS HAPPENED 2 MORE TIMES, ONCE WHILE REVERSING (STRAIGHT) AND THE OTHER WHILE AGAIN TURNING INTO A PARKING LOT - THIS ALMOST RESULTED IN AN ACCIDENT. BOTH TURNS WERE RIGHT TURNS. THE VEHICLE IS BEING INSPECTED, AGAIN, BY THE DEALERSHIP WITH THE SAME OUTLOOK; IF IT CANNOT BE REPRODUCED, THERE IS NOTHING THEY CAN DO. THE TRANSMISSION SLIPS ALSO BUT THE DEALERSHIP SAYS THEY'RE NOT RELATED. THERE ARE SEVERAL INCIDENTS SIMILAR TO THIS ONLINE, AS FAR AS I CAN TELL, NONE HAVE BEEN RESOLVED. THIS IS A VERY DANGEROUS SITUATION THAT WILL SURELY END UP IN AN ACCIDENT EVENTUALLY. THE FIRST INCIDENT WAS AT (ABOUT) 14,500 MILES AND LAST 2 WERE BETWEEN 35,000 AND 38,000 MILES. *TR

TRANSMISSION ISSUES ESPECIALLY IN DOWNSHIFTING. *TR