OnStar Vehicle Diagnostics can perform a vehicle check every month. It will check
the engine, transmission, antilock brakes, and other major vehicle systems. It also
checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring
System. If an On-Demand Diagnostics check is needed, press
, and an Advisor can run a check.
Connections
OnStar Additional InformationParking
If the vehicle has a manual transmission, before getting out of the vehicle,
move the shift lever into R (Reverse) if parking on a downhill slope. On a level
surface or an uphill slope, use 1 (First) gear.
Firmly apply the parking brake. Turn the wheels toward the curb for a downhill
slope, o ...
Reduced Engine Power Light
The reduced engine power light should
come on briefly as the engine is started. If it does not come on, have the vehicle
serviced by your dealer.
This light, along with the malfunction indicator lamp, displays when a noticeable
reduction in the vehicle's performance occurs.
The vehicle c ...
Dinghy Towing (with Automatic Transmission)
Caution
If the vehicle is towed with all four wheels on the ground, the
drivetrain components could be damaged. The repairs would not be covered by the
vehicle warranty. Do not tow the vehicle with all four wheels on the ground.
Vehicles with an automatic transmission should not be towed w ...