OperationDEF Contamination or SCR System FaultWARNINGTo prevent property damage, personal injury,and / or death, seek service immediately if DEFcontamination or SCR system fault is detected.Failure to resolve the problems may result in aloss of engine power and vehicle speed, and maycause an accident.If incorrect liquid is in the DEF tank or if some other fault isdetected within the SCR system, the Amber Warning Lamp orMalfunction Indicator Lamp will illuminate. If no action is takenin the initial warning stages, engine performance will be deratedby at least 25%, and eventually vehicle speed may be limited to5 mph (8 km/h).See the following tables for detailed explanation of DEF or SCRsystem indicators.172
