14731 - SERVICE UPDATE. REPLACE THE FRONT BUMPER ASSEMBLY ON CERTAIN 2015 MODEL YEAR GMC SIERRA HD VEHICLES EQUIPPED WITH ALL TERRAIN APPEARANCE PACKAGE (RPO GAT). THESE VEHICLES MAY HAVE BEEN BUILT WITH FRONT BUMPERS THAT INCLUDE FRONT PARKING ASSIST ALARM SENSORS. THESE SENSORS SHOULD NOT HAVE BEEN INCLUDED IN THE STANDARD ALL-TERRAIN OPTION PACKAGE. THESE FRONT PARK ASSIST ALARM SENSORS ARE NOT FUNCTIONAL.
