
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 LightFluid and Lubricant Recommendations
Fluid and Lubricant RecommendationsUsageFluid/LubricantEngine OilUse only engine oil licensed to the dexos1 specfication, or equivalent, of the properSAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended.Engine Coolant50/50 mixture of clean, drinkable water and use only DEX-COOL Coolant ...