2008 GMC YUKON XL Engine Problems

TL* THE CONTACT OWNS A 2008 GMC YUKON XL. THE CONTACT STATED THAT THE VEHICLE WOULD ONLY ACCELERATE TO 10 T0 15 MPH. IN ADDITION, THE STABILITRAC, ENGINE CONTROL MODULE, AND ENGINE POWER REDUCED INDICATORS ILLUMINATED. THE CONTACT WAS ABLE TO DRIVE THE VEHICLE ONTO THE ROAD SHOULDER. THE VEHICLE WAS TAKEN TO SOUTHERN GREEN BRIER GMC (1300 SOUTH MILITARY HIGHWAY, CHESAPEAKE, VA 23320, 757-424-2418). THE DEAELER PERFORMED A DIAGNOSTIC TEST THAT LOCATED FAILURE CODES P2122, P2138, AND P2128. THE DEALER REPLACED THE BATTERY TWICE AND THE BATTERY CABLES WERE REPLACED SEVERAL TIMES; HOWEVER, THE FAILURE WAS NOT CORRECTED. THE CONTACT ALSO STATED THAT THE VEHICLE WAS TAKEN TO FOUR UNKNOWN DEALERS WHO STATED THAT THE FAILURE WAS DUE TO AN ELECTRICAL FAILURE. THE MANUFACTURER WAS CONTACTED AND PROVIDED CASE NUMBER: [XXX]. THE VEHICLE WAS NOT REPAIRED. THE APPROXIMATE FAILURE MILEAGE WAS 20,000. PARTS OF THIS DOCUMENT HAVE BEEN REDACTED...

5.3 SEVERE OIL CONSUMPTION. AFTER DEACTIVATING THE FUEL MANAGEMENT SYSTEM IT DID SLOW THE CONSUMPTION BUT DID NOT ELEMINATE PROBLEM. NO OIL LEAKS ON ENGINE. MECHANIC SAID IT'S BURNING IT. SO HOW IS THE ECO FRIENDLY? I'VE OWED THIS VEHICLE SINCE 150K NOW I'M ABOUT 180K

MY 2008 YUKON XL IS GIVING SEVERAL ERROR MESSAGES. TRACTION CONTROL OFF, SERVICE STABILITRAC, CHECK ENGINE LIGHT REMAINS ON EVEN AFTER I'VE REPLACED THE THROTTLE POSITION SENSOR, COIL PACK, FULL TUNE UP NOTHING SEEMS TO FIX THE ISSUE AND I SEE THAT I'M NOT THE ONLY ONE EXPERIENCING THIS ISSUE. ANY INSIGHT ON RESOLVING THIS PROBLEM WOULD BE GLADLY APPRECIATED IT IS ALSO USING MORE OIL THAN USUAL. *TR