The vehicle has a Traction Control System (TCS) and StabiliTrak, an electronic stability control system.
These systems help limit wheel slip and assist the driver in maintaining control, especially on slippery road conditions.
TCS activates if it senses that any of the drive wheels are spinning or beginning to lose traction. When this happens, TCS applies the brakes to the spinning wheels and reduces engine power to limit wheel spin.
StabiliTrak activates when the vehicle senses a difference between the intended path and the direction the vehicle is actually traveling.
StabiliTrak selectively applies braking pressure to any one of the vehicle wheel brakes to assist the driver in keeping the vehicle on the intended path.
In some cases, if cruise control is being used and TCS or StabiliTrak begins to limit wheel spin, cruise control may disengage. Cruise control may be turned back on when road conditions allow.
When enabled, both systems come on automatically when the vehicle is started and begins to move. The systems may be heard or felt while they are operating or while performing diagnostic checks. This is normal and does not mean there is a problem with the vehicle.
It is recommended to leave both systems on for normal driving conditions, but it may be necessary to turn TCS off if the vehicle gets stuck in sand, mud, ice, or snow.
See If the Vehicle Is Stuck and "Turning the Systems Off and On" later in this section.
The indicator light for both systems is in the instrument cluster. This light will:
If either system fails to turn on or to
activate, a message displays in the
Driver Information Center (DIC), and
comes on and stays on to
indicate that the system is inactive
and is not assisting the driver in
maintaining control. The vehicle is
safe to drive, but driving should be
adjusted accordingly.
If comes on and stays on:
Drive the vehicle. If comes on
and stays on, the vehicle may need
more time to diagnose the problem.
If the condition persists, see your dealer.
Selecting the Right Engine Oil
(Diesel Engines)
Selecting the right engine oil
depends on both the proper oil
specification and viscosity grade:
Specification
Ask for and use engine oils that
meet the dexos2 specification.
Engine oils that have been
approved by GM as meeting the
dexos2 specification are marked
with the dexos2 approved ...