
For the base level cluster, this light comes on when the fuel tank is low on fuel. The light turns off when fuel is added. If it does not, have the vehicle serviced.

For the uplevel cluster, this light is near the fuel gauge and comes on briefly when the ignition is turned on as a check to show it is working.
It also comes on when the fuel tank is low on fuel. The light turns off when fuel is added. If it does not, have the vehicle serviced.
Engine Oil Pressure Light
Diesel Exhaust Fluid (DEF) Warning Light#04-06-04-047L: TOP TIER Detergent Gasoline (Deposits, Fuel Economy, No Start, Power, Performance, Stall Concerns) – U.S. Only - (Nov 7, 2013)
Subject:TOP TIER Detergent Gasoline (Deposits, Fuel Economy, No Start, Power, Performance,Stall Concerns) – U.S. OnlyModels: 2014 and Prior GM Cars and Trucks (U.S. Only) This bulletin has been revised to add the 2014 model year. Please discard CorporateBulletin Number 04-06-04-047K. In Canada ...