C0376

DTC C0376

Circuit Description
The Front and Rear Propshaft Speed Sensor is a Permanent Magnet (PM) generator. The PM generator produces a pulsing AC voltage. The AC voltage level and number of pulses increases as speed increases. The module converts the pulsating AC voltage to a propshaft RPM which is used for calculations. The propshaft RPM can be displayed with a scan tool.
This DTC detects greater than 20 degrees difference in the speed sensor inputs.

Conditions for Setting the DTC
The transfer case shift control module detects continued readings of front and rear propshaft speed signal which do not match. The module is unable to determine propshaft speed.
The system will log the DTC if the front and rear propshaft inputs indicates a speed greater than 20% difference for 40 seconds while all of the following are true:
^ The transmission is NOT in Park/Neutral.
^ The engine is running.
^ The front axle is engaged.
^ The front propshaft indicates speed less than 75 mph.
^ Vehicle Speed On Class 2 Data bus exceeds 10 mph.

Action Taken When the DTC Sets
^ All Shifts to AUTO 4WD mode will be disabled. If the current mode is AUTO 4WD, the system will not allow any further adaptive events (correct wheel slip).
^ The SERVICE indicator (4WD/AWD) lamp 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.





Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
2. Helps determine if the transfer case speed sensors are working properly.
3. Tests to see if the DTC will reset.
4. Inspects for mismatches and whether speed sensors are wired correctly.
5. Inspects the transfer case for mechanical failures.