Forum Discussion
"Diagnostic Alert" while truck is off?
- 4 years ago
Mystery solved. Sharing here in case anyone else runs into something similar...
I spoke with an OnStar rep yesterday. After doing a bit of research she informed me that my truck is equipped with an "11th generation" OnStar that will perform a "sleep cycle" diagnostic if powered off between 3-5 days.
The dealership was closed Monday for MLK Day. Since the truck had not been powered on for at least 3 days it must have run the "sleep cycle" diagnostic at nearly 10pm, triggering the text message about my tire having low pressure.
Mystery solved. Sharing here in case anyone else runs into something similar...
I spoke with an OnStar rep yesterday. After doing a bit of research she informed me that my truck is equipped with an "11th generation" OnStar that will perform a "sleep cycle" diagnostic if powered off between 3-5 days.
The dealership was closed Monday for MLK Day. Since the truck had not been powered on for at least 3 days it must have run the "sleep cycle" diagnostic at nearly 10pm, triggering the text message about my tire having low pressure.