Conditions for Setting the DTC

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Open in the control circuit of the compressor motor relay.
Short to ground in the control circuit of the compressor motor relay.
Short to battery in the control circuit of the compressor motor relay.
Open in the ignition 3 voltage circuit of the compressor motor relay.
Open IGN 3 fuse.
A malfunctioning compressor motor relay.