Hello & Welcome,
The OnStar folks were correct - this code is part of the emissions system, or more exactly, part of the Evaporative Emissions System. Here is the details from the maintenance manual.
This DTC tests for undesired intake manifold vacuum flow to the Evaporative Emission (EVAP) system. The powertrain control module (PCM) seals the EVAP system by commanding the EVAP purge valve OFF (closed) and the EVAP vent valve ON (closed). The PCM monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system. If the vacuum in the EVAP system is more than a calibrated value within a calibrated time, DTC P1441 will set.
Conditions for Running the DTC
Conditions for Setting the DTC
A continuous open purge flow condition is detected during the diagnostic test (fuel tank pressure decreases to less than -11 inches H2O).
Conditions for Clearing the MIL/DTC
If you have a smog test coming up soon, then this might be a concern. But if it is not causing any other performance problems, then I would not worry about it at this time, as the test was run and passed, which is what cleared the code & the light on the dash. Without that light on, and the condition present that caused to light in the first place, any tech would just be guessing at what was wrong.
I hope this helps. Please let me know if you need more information.
Take Care, Greg A.