2003 GMC Sierra 1500 Pickup Owner's Manual - Page 512

Automatic Transmission Check Check the transmission fluid level; add if needed. See Automatic Transmission Fluid (Except Allison Transmission) on page 5-25 or Automatic Transmission Fluid (Allison Transmission) on page 5-28. A fluid loss may indicate a problem. Check the system and repair if needed. Starter Switch Check Hydraulic Clutch System Check Check the fluid level in the clutch reservoir. See Hydraulic Clutch on page 5-32. A fluid loss in this system could indicate a problem. Have the system inspected and repaired at once. I When you are doing this check, the vehicle could move suddenly. If it does, you or others could be injured. Follow the steps below. 1. Before you start, be sure you have enough room around the vehicle. 2. Firmly apply both the parking brake and the regular brake. See Parking Brake on page 2-44 if necessary. Do not use the accelerator pedal, and be ready to turn off the engine immediately if it starts. At Least Once a Year Key Lock Cylinders Service Lubricate the key lock cylinders with the lubricant specified in Part D. Body Lubrication Service Lubricate all body door hinges, hood latch assembly, secondary latch, pivots, spring anchor, release pawl, tailgate hinge, tailgate linkage, tailgate handle pivot points, latch bolt, fuel door hinge, locks and folding seat hardware. Part D tells you what to use. More frequent lubrication may be required when exposed to a corrosive environment. 3. On automatic transmission vehicles, try to start the engine in each gear. The starter should work only in PARK (P) or NEUTRAL (N). If the starter works in any other position, your vehicle needs service. On manual transmission vehicles, put the shift lever in NEUTRAL (N), push the clutch down halfway and try to start the engine. The starter should work only when the clutch is pushed down all the way to the floor. If the starter works when the clutch isn't pushed all the way down, your vehicle needs service. 6-13