See also:

How to Check Lubricant
To get an accurate reading, the vehicle should be on a level surface. A. Drain Plug B. Fill Plug If the level is below the bottom of the fill plug hole, located on the transfer case, some lubri ...

Steering
Hydraulic Power Steering Your vehicle has hydraulic power steering. It may require maintenance. See Power Steering Fluid. If power steering assist is lost due to a system malfunction, the ve ...

Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if ...