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 the
vehicle is equipped with the Tire
Pressure Monitoring System. If a
diagnostics check is needed
between e-mails, push 
, and
an Advisor can run a check.
See also:
Transmission Messages
MANUAL SHIFT
This message displays when the automatic transmission is in manual mode. See
Manual Mode for more information.
TRANSMISSION HOT IDLE ENGINE
Notice: Do not drive the vehic ...
Temperature – A, B, C
The temperature grades are A (the highest), B, and C, representing the tire's
resistance to the generation of heat and its ability to dissipate heat when tested
under controlled conditions on ...
Power Door Locks
Select Power Door Locks and the following will be displayed:
- Unlocked Door Anti Lock Out
- Auto Door Unlock
- Delayed Door Lock ...