Conditions for Setting the DTC
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
A node alive message has not been received from an unidentified module within the last 5 seconds after establishing class 2 serial data communication.