Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

A high voltage condition on the control circuit of the EGR throttle valve vacuum control solenoid is detected by the ECM when the EGR throttle valve vacuum control solenoid is commanded ON.
The above conditions are met for more than 4 seconds.