Conditions for Setting the DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 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