C0327 HUMMER - Transfer Case Encoder Circuit Malfunction
C0327 Hummer DescriptionThe transfer case encoder is a switch that converts a shaft position, representing a mode or range position, into electrical signals for use by the transfer case shift control module. The encoder houses 4 Hall effect sensors that are used for channels P, A, B, and C. These sensors provide a path to ground when a magnet, which is part of the shift rail, passes over them.
The transfer case shift control module supplies an 8-volt reference and a ground circuit for the encoder Hall effect sensors to function.
The transfer case shift control module supplies 5 volts on all the channels. As these channels are pulled to ground, the module can interpret the location of the transfer case shift position.
This DTC detects an open, short to ground, or a short to voltage in the encoder feed circuit, an open in the signal ground circuit, an open, short to ground, or short to voltage in the Encoder channel circuits.
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