2004 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 228

LEFT REAR DOOR AJAR (Crew Cab) If the driver's side rear door is not fully closed, this message will appear on the display and you will hear a chime. Stop and turn off the vehicle, check the door for obstacles, and close the door again. Check to see if the message still appears on the DIC. Press the select button to acknowledge the message and clear it from the DIC display. OIL LIFE RESET This message will appear on the display for about 10 seconds after resetting the change engine oil message. PASSENGER DOOR AJAR If the passenger's door is not fully closed, this message will appear on the display and you will hear a chime. Stop and turn off the vehicle, check the door for obstacles, and close the door again. Check to see if the message still appears on the DIC. Press the select button to acknowledge the message and clear it from the DIC display. LOW COOLANT LEVEL If your vehicle is equipped with a low coolant level sensor, this message will appear on the DIC if the engine coolant level is low. Adding coolant will clear the message. OIL PRESSURE LOW If low oil pressure levels occur, this message will be displayed on the DIC and a chime will sound. Stop the vehicle as soon as safely possible and do not operate it until the cause of the low oil pressure has been corrected. Check your oil as soon as possible and have your vehicle serviced. RANGE SHIFT INHIBITED (Allison Transmission® Only) If the transmission is unable to shift into a selected gear this message will appear on the DIC. The electronic shift position indicator on the instrument panel cluster may blink when this occurs. To make the vehicle shift to the requested gear you may have to shift back to PARK (P) or NEUTRAL (N) and re-select the desired gear. 3-68