C0357

Circuit Description
The park switch supplies a 12 V input to the module when the vehicle is in PARK. The module uses this input to determine if the vehicle is in PARK/NEUTRAL. If the vehicle is in PARK, the module will not allow a range shift from 2H, 4H, or AUTO 4WD mode to 4L range.
This DTC detects voltage on the PNP Switch Output Circuit at the module when the module sees a front or rear propshaft speed signal.

Conditions for Setting the DTC
The transfer case shift control module detects voltage on the PNP Switch Output Circuit at the module when the module sees a front or rear propshaft speed signal, or vehicle speed form the VCM over the Class 2 data bus 10 mph or over for 10 consecutive seconds.

Action Taken When the DTC Sets
^ Whenever PARK/NEUTRAL was true, the module believes the transmission was in PARK.
^ All range shifts will be disabled.
^ The SERVICE indicator (AWD/4WD) 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. This step helps determine if the transfer case shift control module can read the normal state of the Park Switch.
3. This step helps determine if there is an intermittent concern with the PNP Switch Output Circuit.
4. This step helps determine if the park switch is faulty.
5. Tests the PNP Switch Output Circuit for a short to voltage.