Conditions for Setting the DTC
WARNING: This page is about a different car, the 2006 GMC Yukon XL, 2006 Chevrolet Suburban, and 2006 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The PCM detects a voltage out of tolerance condition on the 5-volt reference circuit for more than 2 seconds.