CHEVROLET/GMC: DTCS P0335 OR P0336 SET; MALFUNCTION INDICATOR LAMP (MIL)/CHECK ENGINE LIGHT ON; POSSIBLE EXTENDED ENGINE CRANK OR CRANK/NO START. ENGINEERING IS ATTEMPTING TO DETERMINE ROOT CAUSE OF CRANKSHAFT POSITION SENSOR DTCS. MODELS AVALANCHE, SILVERADO, SUBURBAN, TAHOE, SIERRA, YUKON, YUKON DENALI, YUKON XL, YUKON DENALI XL; MODEL YEAR 2010. *PE