2008 Dodge Ram 2500 Pickup Owner Manual Diesel - Page 198

196 UNDERSTANDING YOUR INSTRUMENT PANEL experience reduced performance, an elevated/rough idle or engine stall and your vehicle may require towing. The light will come on when the ignition is first turned on and remain on for 15 seconds as a bulb check. If the light does not come on during starting, have the system checked by an authorized dealer. 22. SERV 4WD Indicator The 4WD indicator will be illuminated whenever the 4WD mode is engaged for either the manual or electric shift 4WD systems. The SERV 4WD indicator monitors the electric shift 4WD system. If the SERV 4WD light stays on or comes on during driving, it means that the 4WD system is not functioning properly and that service is required. 23. Water In Fuel Indicator Indicates there is water detected in the fuel filter. Refer to the Maintenance section, Draining Fuel/Water Separator Filter, for water drain procedure. 24. Tire Pressure Monitoring Telltale Light - If Equipped Each tire, including the spare (if provided), should be checked monthly when cold and inflated to the inflation pressure recommended by the vehicle manufacturer on the vehicle placard or tire inflation pressure label. (If your vehicle has tires of a different size than the size indicated on the vehicle placard or tire inflation pressure label, you should determine the proper tire inflation pressure for those tires.)