Conditions for Setting the DTC
WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
C0306 01
Voltage on the transfer case clockwise circuit or the transfer case counter-clockwise circuit is greater than 5.60 V.
C0306 02
Voltage on the transfer case clockwise circuit or the transfer case counter-clockwise circuit is less than 1.9 V.
C0306 04
Voltage on the transfer case clockwise circuit is 2.7 - 4.5 V, and the voltage on the transfer case counter-clockwise circuit is 0.5 - 2.5 V.
C0306 54
The calculated temperature of the transfer case range actuator H-bridge in the transfer case control module is greater than a predetermined value.
C0381 54
The calculated temperature of the transfer case range actuator is greater than a predetermined value.