Conditions for Setting the DTC

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

When the BCM monitors a low reference voltage of less than 4.5 volts.
When the BCM monitors a high reference voltage of greater than 5.5 volts.
When the BCM monitors a signal voltage of equal or greater than 4.86 volts for more than 1 second.