2007 GMC YUKON DENALI Power Train Problems

TL* THE CONTACT OWNS A 2007 GMC YUKON DENALI. THE CONTACT STATED THAT THE CHROME PLATING ON ALL THE INTERIOR DOOR HANDLES WERE PEELING CAUSING THE CONTACT TO SUSTAIN MINOR CUTS ON THE HAND. THE CONTACT MENTIONED THAT MEDICAL ATTENTION WAS NOT REQUIRED. IN ADDITION, THE CONTACT STATED THAT WHILE DRIVING AT 40 MPH, THE ENGINE POWER DOWN WARNING INDICATOR ILLUMINATED AND THE VEHICLE DECELERATED TO 20 MPH. THE ACCELERATOR PEDAL WAS DEPRESSED BUT FAILED TO RESPOND AND THE CHECK ENGINE WARNING LIGHT ILLUMINATED. THE VEHICLE WAS RESTARTED AND THE FAILURE PERSISTED. ON ANOTHER OCCASION, THE AIR BAG WARNING LIGHT ILLUMINATED. THE FAILURES OCCURRED ON SEVERAL OCCASIONS. THE VEHICLE WAS NOT DIAGNOSED FOR THE INTIAL FAILURE.THE VEHICLE WAS TAKEN TO A DEALER WHERE IT WAS DIAGNOSED THAT THE THROTTLE BODY NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS...

I HAVE JUST READ A FEW OTHER COMPLAINTS ABOUT AN ISSUE I AM HAVING NOW, AND HAVE HAD 3 TIMES IN THE PAST. WHILE UNDER NORMAL DRIVING CONDITIONS, I HAVE HAD MY SUV BECOME VERY SLUGGISH AND DIFFICULT TO DRIVE. LIGHTS COME ON SAY LOSS OF POWER, STABILITRAC PROBLEM ETC. THE FIRST TIME THIS HAPPENED, I WAS VISITING ORLANDO FLORIDA. I TOOK THE SUV TO A DEALER, AND THEY SAID THERE WAS AN ISSUE WITH THE ECM AND REPROGRAMMED IT. I LEFT BACK THE NEXT DAY FOR ATLANTA. NEARLY 80 MILES AWAY IN OCALA FLORIDA, IT STARTED DOING THIS AGAIN. I CALLED A TOW TRUCK, AND HAD IT TAKEN TO AN OCALA DEALERSHIP. THEY IN TURN TOLD ME IT WAS A BAD ECM, AND AFTER SPENDING AN ENTIRE DAY IN OCALA, I WAS BACK ON MY WAY TO ATLANTA. SEVERAL MONTHS LATER, I HAD THIS OCCUR AGAIN. ONCE AGAIN I...

IT BEGAN W/A HARSH SHIFT FROM 2ND TO 3RD. IT STARTED HAPPENING MORE OFTEN, MY ENGINE LIGHT CAME ON& IT BEGAN SHIFTING SO HARSH IT WOULD JERK YOU. WENT TO MY GM DEALER & THE CODE WAS FOR A THROTTLE BODY SENSOR. THEY REPLACED THE SENSORS & ALSO FOUND A CRACKED MOTOR MOUNT. THEY ADVISED THE CRACK WAS PROBABLY DUE TO THE TRANSMISSION SHIFTING SO HARSH, ALSO THE SHIFTING PROBLEM WAS PROBABLY DUE TO THE SENSOR MALFUNCTION AND THE LACK OF COMMUNICATION FROM THE THROTTLE TO THE TRANSMISSION. THEY REPLACED THE MOUNT & SENSORS. CHARGED ME $700. LEFT THE DEALERSHIP, 15 MINS LATER THE ENGINE LIGHT CAME ON! I TOOK IT STRAIGHT BACK AND DAYS LATER THEY CALLED...COULDN'T FIND ANYTHING WRONG, THE CODE AGAIN WAS FOR THE SENSORS, THEY INSTALLED AGAIN & CHECKED THE SOLENOIDS BUT THEY WERE FINE. THEY ADVISED A NEW TRANSMISSION WAS NEEDED & WOULD BE $2400....

DIAGNOSTIC CODE P0121 - THROTTLE BODY IT IS A COMMON ISSUE AMONG ALL DENALI OWNERS AND IS COVERED UNDER WARRANTY. BUT IF THIS ISSUE IS KNOWN BY THE MANUFACTURER THIS SHOULD BE A RECALL AS THIS COULD CAUSE AN ACCIDENT. SOLUTION IS TO REPLACE THE THROTTLE BODY (WHICH ARE CURRENTLY ON BACK ORDER) DEALERS WILL CHARGE BETWEEN $95 & $110 TO DIAGNOSE THE PROBLEM AND DETERMINE IF IT IS COVERED UNDER WARRANTY. OWNERS SHOULD BE WEARY OF DEALERS TRYING TO CHARGE FOR THIS FIX. ESPECIALLY OF THE DENALI IS UNDER 100K MILES. *TR

VEHICLE DOWNSHIFTED AND ACCELERATED WHILE COASTING AT AROUND 45 MILES PER HOUR. FOOT OFF ACCELERATOR. APPLIED BRAKE AND CAR RETURNED TO NORMAL HAPPENED ON WEDNESDAY JUNE 2, 2010 NEAR LABADIE MISSOURI AND ON FRIDAY JUNE 4, ON INTERSTATE 55 NORTH OF MIDWAY AIRPORT IN CHICAGO. *TR