Diagnostic Aids

Some reductant fluid (DEF) fill equipment may aerate the fluid which can temporarily affect the operation of the reductant quality sensor. A DTC may set and the Service Emission System message may display in the driver information center. The fluid aeration will quickly dissipate on its own and operation of the reductant quality sensor will return to normal. Filling the reductant fluid tank with the key off will help prevent the reductant quality sensor from being affected by this condition.