See also:

What to Use
WARNING Adding only plain water or some other liquid to the cooling system can be dangerous. Plain water and other liquids, can boil before the proper coolant mixture will. The coolant warni ...

Fluids
Proper fluid levels and approved fluids protect the vehicle’s systems and components. See Recommended Fluids and Lubricants for GM approved fluids. - Engine oil and windshield washer fluid ...

ELECTRONIC KEY ALREADY KNOWN
If the vehicle has the keyless access system, this message displays if you try to match a transmitter that has already been learned. See the keyless access information for Remote Keyless E ...