Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

After the transfer case shift control module grounds the output, the 4WD LO circuit, and reads back a high voltage, the DTC sets. The system does not attempt setting the DTC again for 5 seconds.
The transfer case shift control module reads back a high voltage when a low voltage is expected on the 4WD LO circuit.