Conditions for Setting the DTC

WARNING: This page is about a different car, the 2006 GMC Sierra, 2006 GMC Cab & Chassis Sierra, 2006 Chevrolet Silverado, and 2006 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

One of the following conditions occur for 4.3 out of 5 seconds.

The PCM commands the 2-3 SS valve ON, and the voltage input remains high, B+.
The PCM commands the 2-3 SS valve OFF, and the voltage input remains low, 0 volts.