P015d Code Chevy Silverado Yukon gmc throttle p0121 Gmc yukon p0121 code fix and throttle body cleaning GMC Yukon P0121 code fix and throttle body cleaning - YouTube GMC Yukon P0121 code fix and throttle body cleaning - YouTube Check Details ← 2013 Chevy Silverado 1500 Code P015d P015b Code 2013 Silverado → Share with friends Link copied