Transfer Case DTC C0327 TXFR Case Encoder


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Posted by Matt L. (Old Timer) (71.211.120.10) on 11:31:19 10/26/14

Yes, I've been around here for quite some time.

2001 3/4 ton 4X4 Suburban, 4:10 to 1 Gears, lockers, electronic 2 speed transfer case.

So just for let's see if there is any expertice left here:

I can reset the DTCs and it will immediately reset the code on startup. Here's what alldata says about it:

DTC C0327

Circuit Description

The 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.

Conditions for Setting the DTC

The transfer case shift control module reads back all high or low voltage on the Encoder channel circuits.

Action Taken When the DTC Sets

All motor activity will stop and the Transfer Case Lock engaged.
A default rail to rail shift may be allowed, toggle between 4H and 2H.
The SERVICE 4WD indicator will be latched on for the remainder of the current ignition cycle.

Conditions for Clearing the DTC

The transfer case shift control module will clear the DTC if the condition for setting the DTC no longer exists.
A history DTC will clear after 100 consecutive ignition cycles without a fault present.
History DTCs can be cleared using a scan tool.

Thanks! (Oldtimers!)

Matt



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