This light, a Driver Information Center (DIC) Message, and a chime come on when there is an issue with the DEF.
If the DEF issue has not been corrected, the light will continue to flash. The vehicle's speed may also be limited. See Diesel Exhaust Fluid.
Fluid Trough Installation Automatic Transmission Unit
Fluid Trough InstallationCalloutComponent Name1A/Trans Fluid Pump Outlet Seal Assembly2A/Trans Fluid Trough (O-ring) Seal3A/Trans Fluid Trough4A/Trans Fluid TroughBolt-M6-x-25 (Qty: 1)Caution:Refer toFastener Caution.Tighten12-Y(106-lb-in). ...