One problem related to water pump has been reported for the 2018 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 GMC Sierra 1500 based on all problems reported for the 2018 Sierra 1500.
Customer states: thinks crankshaft pulley is loose due to prior water pump replacement-crackshaft pulley has nothing to do with water pump replacement. Before inspecting/starting engine verified oil level-oil level is on full mark. Started engine-loud rattling/knocking noise from engine-engine has internal failure-engine replacement is required. Also hearing noise in rearend-cannot test drive due to engine condition several TSB's on engine failures with 6. 2l engines. Gm has possible recalls coming on 2019-2024 yr models. Not sure if earlier models maybe included underhood inspection 1 7003186 06ns 52. 50 52. 50 lbr-disc cust sat.