Conditions for Setting the DTC

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

A shift request was received but could not be completed within 15 seconds causing this DTC to set.
An incomplete shift is one that cannot reach the desired mode or range and cannot return to the original mode or range.
If the shift lever detent shaft were to bind, or there was a mechanical failure, or motor A control and motor B control were shorted together the shift would not be completed. This will cause the DTC to set in order to protect the system components from damage.
A faulty transfer case shift control module can cause incorrect incremental sensor or motor current measurements which would also result in this DTC setting.
Intermittent motor A/B or incremental sensor circuit wiring failures can also cause this DTC to set.