One problem related to diesel engine has been reported for the 2019 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2019 GMC Sierra 2500 based on all problems reported for the 2019 Sierra 2500.
Emissions code showed up on the dash display. Tried to fix the fuel filter and cleaned a sensor off and it still shows the emissions code.