2008 Dodge Ram 2500 Pickup Owner Manual Diesel - Page 430

428 MAINTAINING YOUR VEHICLE CATALYST FULL SERVICE REQD If the particulate filter reaches 99% of its capacity, the overhead console in your vehicle will chime twice and display the message CATALYST FULL SERVICE REQD. At this point the engine PCM will register a fault code, the instrument panel will display a MIL light and the engine PCM will derate the truck, reducing its horsepower and torque output. The PCM derates the engine in order to limit the likelihood of permanent damage to the aftertreatment system. If this condition is not corrected and a dealer service is not performed, extensive exhaust aftertreatment damage can occur. In order to correct this condition it will be necessary to have the truck serviced by your local authorized dealer. Maintenance Free Batteries The top of the maintenance free batteries are permanently sealed. You will never have to add water, nor is periodic maintenance required. NOTE: Replacement batteries should both be of equal capacity to prevent damage to the vehicle's charging system.