Fuel System/Emissions
Sensors (O₂, or oxygen, sensor), emission-control devices (includes EGR), fuel-injection system, fuel gauge/sender, fuel pump, problems filling up the tank.
What Owners Say
""45,000 seems like low. Milage for fuel injection pump problems Truck used on pavement all the time pulled a Coachman 20 ft camper total of 2000 miles when transmission went out Truck had been serviced big tire and service center in popular Bluff Missouri before trip""
Anonymous A., AR (2020 GMC Sierra 1500 SLE 3.0-L 6 Cyl diesel)"DEF sensor failed (or something related to the DEF and emissions control). Was repaired under warranty."
Anonymous, CA (2020 GMC Sierra 1500 Denali 3.0-L 6 Cyl diesel)"Purge sensor module most recently replaced and last year it was some hose issue. Expensive repairs not covered by warranty of course."
Anonymous, PA (2020 GMC Sierra 1500 Elevation 5.3-L V8)
"Turbo charger actuator replacement before turbo charger replaced Also replaced front axle Also replaced $400 DOLLAR control box of some type Payed to have truck computer reprogrammed Did a company recall for programming updates to truck computer so when a part in transmission went bad it would not tare up transmission So what happened was I paid for a default in transmission that the company discovered after I had my problem started coverage"
Anonymous A., AR (2020 GMC Sierra 1500 SLE 3.0-L 6 Cyl diesel)