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:
If No Steam Is Coming from the Engine Compartment
If an engine overheat warning is displayed but no steam can be seen or heard, the problem may not be too serious. Sometimes the engine can get a little too hot when the vehicle:
• Climbs a long hil ...
Transferring Audio from the Bluetooth System to a Cell Phone
During a call with the audio in the vehicle:
1. Press .
2. Say “Transfer Call.” ...
When the System Does Not Seem To Work Properly
The RVC system may not work properly or display a clear image if:
○ The RVC is turned off. See “Turning the Rear Vision Camera System On or Off”
earlier in this section.
○ It is da ...